Events and activities of the Rocky Mountain Section of SEPM
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Event from 3:00-5 pm
WHAT IS IT?: Student Research Symposium to provide a dedicated space to highlight student’s research
WHY SHOULD YOU ATTEND?: This is an excellent way for sharing ideas, networking, and having fun!
WHO IS INVITED?
Students (undergraduate or graduate) interested in presenting ongoing or completed research related to sedimentology and stratigraphy.
Professionals interested in engaging & providing feedback and support to students.
WHEN/WHERE IS IT?: February 28th, 2025 3:00-5 pm. Please register to receive access.
Free to attend
Email questions to information@rmssepm.org
Event from 3:00-5 pm
WHAT IS IT?: Student Research Symposium to provide a dedicated space to highlight student’s research
WHY SHOULD YOU ATTEND?: This is an excellent way for sharing ideas, networking, and having fun!
WHO IS INVITED?
Students (undergraduate or graduate) interested in presenting ongoing or completed research related to sedimentology and stratigraphy.
Professionals interested in engaging & providing feedback and support to students.
WHEN/WHERE IS IT?: February 26th, 2025 300-5 pm. Please register to receive access.
Free to attend
Email questions to information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Emilie Gentry-TEVERRA
Abstract:
Geothermal exploration and subsurface structural modeling are critical processes for identifying and evaluating geothermal resources. This study focuses on the integration of geological, geophysical, and geochemical data to assess geothermal potential and develop accurate subsurface models. Geothermal exploration involves the analysis of surface expressions, temperature gradients, and fluid flow patterns, while subsurface structural modeling utilizes techniques such as seismic surveys, well logging, and 3D modeling to create a detailed representation of underground formations. The objective is to identify key parameters such as reservoir size, permeability, and heat distribution, which are essential for effective resource management and sustainable energy production. By combining advanced modeling tools with comprehensive exploration data, this approach enhances the understanding of geothermal reservoirs and supports informed decision-making in the development of geothermal energy projects.
Bio
Emilie Gentry, Senior Geothermal Geoscientist with TEVERRA providing geological mapping, resource assessment, and geothermal conceptual model development. Her technical expertise is structural and subsurface geology with experience in geologic research and oil and gas development, exploration, reservoir characterization, and regulatory affairs management. Emilie uses her knowledge in faults and structural geology and her experience in oil and gas to address major challenges in the geothermal industry and bring opportunity to the larger energy industry. She earned her B.Sc. in Geological Sciences from the University of Texas at Austin and her M.Sc. in Geology at the Colorado School of Mines.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Rand Gardner-USGS
Abstract:
A 3D basin model was developed to evaluate geothermal resources within the Denver-Julesburg Basin. This evaluation utilizes legacy datasets generated by oil and gas developers alongside new paleoenvironmental studies to predict the depth and distribution of potential geothermal resource in the basin. A key benefit of basin modeling is that it provides lithology-based thermal properties, which helps improve temperature-depth profiles for geothermal studies. Depth and isopach maps were created from formation tops for 24 depositional units across the basin to generate a 3D grid with approximately 800,000 cells. Lithologic properties derived from paleogeographic maps were assigned to each cell. Approximately 20,000 bottom-hole temperature (BHT) measurements were corrected using a Förster-type model. The resulting corrected temperatures ranged from 130°F to 436°F and nearby wells were grouped into equal-area cells to create robust temperature profiles for calibration. The model was simulated every 10mW-m2 from 50 to 80mW-m2 and the heat flow scenario that best matched the corrected temperature profile in each cell was selected and contoured into a heat flow map. An aeromagnetic map was used to help guide the heat flow map along basement features where data was sparse. Results derived from the calibrated model indicate highly elevated heat flow in the Wattenberg field area. Depth to temperature maps were created for moderate- (≥194°F) and high-temperature (≥302°F) geothermal resource cut-offs. These maps suggest that in some areas, moderate and high-temperature resources may be as shallow as 4,000 and 7,000 feet, respectively. In contrast, geothermal resources in other areas of the basin are generally deeper for both temperature cut-offs. The resulting lithologic and temperature model for the Denver-Julesburg Basin identifies depth ranges where potential geothermal resources are likely to be located, with lithology further informing whether permeability is present. In layers with limited permeability, development strategies such as enhanced or engineered geothermal systems and deep closed-loop technologies may be viable.
Bio
Rand grew up in the oil patch where he learned the ins and outs of the energy industry. He worked for Big Oil as a wildcatter before joining the USGS in 2021 where he now leads a team doing research and resource assessments. He has done fieldwork and/or resource exploration in Suriname, Guyana, French Guyana, Trinidad and Tobago, Venezuela, Spain, France, Turkey, Mexico, USA, and Canada.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Dr. Sarah Compton-FractureID
Abstract:
Understanding how and why fluids move in the subsurface is key to characterizing and most efficiently developing an operator’s acreage. In the DJ Basin, oil from the Niobrara and Codell likely has a common source, and their reservoirs are likely in communication with each other. Great Western Petroleum, a pure-play DJ operator, designed the Wilson project in 2019 through a structurally calm area, with one large graben cutting the full section along the toes of the wells, to characterize fluid movement in space and time. In 2020, data from eight parent wells on the nearby Postle pad was added. This pad is characterized by several faults cutting the full section at various spots along the lateral. The case studies show differences in fluid communication despite similar completion methods, perhaps relating to different structural settings.
Bio
Sarah Compton is a geoscientist in Morrison, CO who currently works full-time with FractureID and publishes the weekly AAPG tech and innovation newsletter called Enspired. She completed an NSF iCorps Starting Blocks cohort in spring of ‘23 and was invited to present her business proposition for a SAGE mentorship group, which she was awarded and is currently working with while she actively develops her own software. The target customer is small to medium operators, and she is happy to discuss that in more detail afterwards.
Sarah earned her PhD in geology from the University of Alabama, using linear inversions to focus on the impacts of different model setups of finite element models using Hekla Volcano in Iceland. Her MS and BS in geology were earned at IUPUI focusing on the crustal evolution of southern and southeastern California using igneous petrology.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Maxwell Pommer*, J. Frederick Sarg, Forrest McFarlin
Department of Geology and Geological Engineering, Colorado School of Mines
maxwell.pommer@gmail.com
*currently at Premier Corex, University of Colorado Boulder
Abstract:
Integrated stratigraphic, petrographic, and geochemical data allow interpretation of biogeochemical and mineralization processes in paleoenvironmental context of ancient lacustrine environments. These indicate lake chemistry, microbial processes, and organic matter (OM) strongly influenced dolomite formation in near-surface environments throughout deposition of the Green River Formation (Eocene, Uinta basin, Utah).
The lower Green River Formation consists of interbedded fluvio-deltaic siliciclastics, paleosols, carbonate mud, coated-grain carbonates, mollusc and ostracod limestones, and microbialites all landward of profundal OM-bearing illitic mudrocks. Calcite, dolomite, Fe-dolomite, and authigenic feldspars are common. Carbonate δ18O and δ13C are covariant, and positive excursions of carbonate δ13C (up to 6.9‰VPDB) and organic-matter δ15N (up to 13.9‰V-AIR) occur in profundal OM-bearing mudrocks.
The upper Green River Formation consists mainly of laminated OM-lean and OM-rich dolomitic muds (i.e., “oil-shales”). Zoned dolomite crystals with Mg-calcite centers and Fe-dolomite rims are widespread in addition to authigenic feldspars, and Na-carbonates. Carbonate δ13C-enrichment (up to 15.8‰VPDB), and organic-matter δ15N-enrichment (up to 18.4‰V-AIR) occur in these OM-rich dolomite muds. Organic-matter δ13C is relatively invariable (mean = -29.3‰VPDB) and does not covary with carbonate δ13C.
Trends in mineralogy, organic-matter abundance, and stable isotopes result from changing hydrologic systems, paleoclimate, lake chemistry and microbial processes coincident with the Early Eocene Climate Optimum. The lower Green River Formation paleo-lake was smaller in area and volume, heavily influenced by meteoric fluvial input, variably oxygenated, and ranged from neutral and fresh to alkaline and saline. Especially in littoral environments with abundant microbialites, dolomite formed through recrystallization of precursor carbonate involving both replacement of precursor carbonate and direct precipitation as cements and overgrowths. The upper Green River Formation paleo-lake was more expansive with widespread low-oxygen, nutrient-rich, and alkaline saline environments with increased planktic organic-matter productivity. Microbial decay of organic matter in low-oxygen environments produced alkaline lake waters through methanogenesis, possible denitrification, and microbial sulfate reduction to a limited degree. This favored precipitation of widespread dolomite, as well as Na-carbonates, authigenic feldspars, and analcime from lake water and phreatic pore water. Extracellular polymeric substances (EPS) excreted by microbial communities provided favorable nucleation sites for Mg-carbonate, allowing kinetic barriers of low-temperature dolomite formation to be overcome. Cycling of pH due to turnover of organic matter and associated microbial processes potentially bolstered EPS generation and abiotic environmental conditions favorable to dolomite precipitation. It is likely that metastable precursor carbonate was recrystallized to ordered dolomite, but it is possible that direct precipitation occurred. Fe-dolomite overgrowths precipitated after dolomite where microbial Fe reduction occurred in stagnant, oxygen-depleted, alkaline pore waters.
Pommer, M., Sarg J.F., McFarlin, F., Environmental and Microbial Influence on Lake Chemistry and Dolomite Formation in the Green River Formation (Eocene), Uinta Basin, Utah. Journal of Sedimentary Research, v.93, no.4, 2023, p. 213-242.
Biography: Max is a geologist who evaluates fluid-reservoir systems and Earth’s history with integrated stratigraphic, petrologic, and geochemical methods. His research spans a broad range of topics including pore-system evolution, linking diagenesis and sequence stratigraphy, the origin of dolomite, as well as paleoenvironmental and biogeochemical dynamics.
Currently, he is a senior Geological Advisor and Lead Sedimentologist at Premier Corex, as well as a Faculty Lecturer at the University of Colorado Boulder, where he instructs a course in Petroleum and Transitional Reservoir Geology. He holds a bachelor’s degree from the University of Colorado Boulder, a master’s degree from The University of Texas at Austin, and a doctorate from Colorado School of Mines. Previously he was a Postdoctoral Researcher at Colorado School of Mines and has been a consultant in industry since 2011.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Colorado School of Mines Talk: Direct Monitoring of Sediment Density Flows on the Ocean Floor
Dr. Kira Timm
USGS Central Energy Resources Science Center
Abstract:
The Late Cretaceous Niobrara Formation represents one of the Western Interior Seaway’s major transgressive-regressive cycles, containing within it four third-order cycles. As a regionally extensive formation, lithology changes laterally and stratigraphically, dependent upon intrabasinal and extrabasinal sediment source. In areas distal to the Sevier highlands, lithologies contain greater intrabasinal input, consisting of peloidal chalks composed of coccolithophores, foraminifera, and other calcareous bioclasts. Proximal lithologies contain greater extrabasinal input and consist of peloidal carbonates in an argillaceous-silicious matrix.
The proximal Sand Wash and Washakie Basins contain Niobrara deposits from the foredeep. Here organic matter (OM) enrichment occurred in calcareous mudstones deposited during highstand conditions with marine OM primarily tied to calcareous peloids and terrestrial OM matter contained within the argillaceous-silicious matrix. Within the Denver Basin’s distal ramp environments, OM enrichment occurred in lowstand marls. Despite different eustatic conditions, the organic-rich formations are mineralogically similar, consisting of mixed carbonate mudstones.
Petrographic analysis indicates transport of OM with mineralogical components prior to deposition and preservation. During highstands, the proximal foredeep received less detrital input, less bottom water oxygenation, and westward transport of calcareous peloids and OM. In the distal ramp, oxic bottom water conditions reduced OM preservation. During lowstands, high detrital input into the foredeep buried but diluted OM. On the distal ramp, OM was transported eastward with hyperpycnal clays into dysoxic to anoxic bottom waters resulting in excellent OM preservation. While pelagic deposition is implicit in intrabasinal deposits, sedimentary structures and OM-mineralogic connection implies reworking and transport within the Niobrara.
Biography:
Kira Timm is a geologist with the U.S. Geological Survey working on the National and Global Assessment team in Lakewood, Colorado. Her research focuses on the Cretaceous strata of the Rocky Mountain region, with an emphasis in mudstone geology and petrography. In addition to research and hydrocarbon assessments, Kira runs one the of the USGS microscope labs where she enjoys the little things in life. Though not a Colorado native, she has been a Colorado geologist since moving to Denver in 2012 and obtaining her PhD in petroleum geology at the Colorado School of Mines in 2018.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Event from 3:30-5 pm
WHAT IS IT?: Student Research Symposium to provide a dedicated space to highlight student’s research
WHY SHOULD YOU ATTEND?: This is an excellent way for sharing ideas, networking, and having fun!
WHO IS INVITED?
Students (undergraduate or graduate) interested in presenting ongoing or completed research related to sedimentology and stratigraphy.
Professionals interested in engaging & providing feedback and support to students.
WHEN/WHERE IS IT?: March 8th, 2024 3:30-5 pm. Please register to receive access.
Free to attend
Email questions to information@rmssepm.org
Event from 3:30-5 pm
WHAT IS IT?: Student Research Symposium to provide a dedicated space to highlight student’s research
WHY SHOULD YOU ATTEND?: This is an excellent way for sharing ideas, networking, and having fun!
WHO IS INVITED?
Students (undergraduate or graduate) interested in presenting ongoing or completed research related to sedimentology and stratigraphy.
Professionals interested in engaging & providing feedback and support to students.
WHEN/WHERE IS IT?: March 6th, 2024 3:30-5 pm. Please register to receive access.
Free to attend
Email questions to information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Dr. Jason Flaum
USGS Central Energy Resources Science Center
Abstract:
Since the discovery of world-class hydrocarbon reservoirs within fine-grained rocks there has been a concerted effort to improve our understanding of the heterogeneity in composition, texture, and structure of these lithologies. Such improved characterization has led to several paradigm shifts in interpretations of the depositional processes and environments associated with the occurrence of carbon-rich rocks in the geologic past. These paradigm shifts have resulted in improved exploration and development of both continuous resources and conventional resources via application to the assessment of source rocks.
Prior to the recent paradigm shifts mentioned above organic-rich fine-grained rocks were interpreted to be homogenous and having been deposited in quiescent oxygen deficient environments. Such interpretations were the basis of many of the tools developed for the exploration of source rocks. One such tool is DeltaLogR, a petrophysics based method of calculating organic-richness of mudstones. Originally developed for assessment of organic-richness in homogenous, argillaceous lithologies, application of DeltaLogR to heterogenous calcareous lithologies that are typically associated with Mesozoic continuous resource plays has proven difficult. In particular, two primary limiting factors have been identified: 1. Establishing a proper baseline; and 2. False positives associated with resistivity increasing at a greater percentage than sonic in cemented limestones.
In this study we present detailed lithologic and geochemical descriptions of Cenomanian-Turonian aged calcareous mudstones from the Greenhorn Formation of the USGS #1 Portland Core. These descriptions are then utilized to establish proper recognition criteria for the identification of proper baseline units and false positive DeltaLogR values throughout the study interval. Utilization of proper baseline units and removal of false positive values in the Greenhorn Formation allowed for accurate determination of organic carbon concentrations throughout the unit when compared to measured values. The methodology presented in this study demonstrates that the DeltaLogR method can be an essential tool for evaluating organic carbon concentrations over a range of lithologies.
Bio:
Jason Flaum is a research sedimentologist at the USGS Central Energy Resources Science Center in Lakewood Colorado. Following completion of his PhD at Northwestern University he spent 11 years in industry at ExxonMobil and TOTAL evaluating continuous resource plays and source rock evaluations around the world. He has now been at the USGS since September, 2020 where he is part of an integrated research team utilizing inorganic and organic geochemistry, sedimentology, petrography, and petrophysics to evaluate the depositional processes and environments associated with the accumulation of organic and inorganic carbon-rich strata during extreme climate events throughout the Phanerozoic.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Presented by Jason Eleson
GeoIntegra Group
Abstract:
The DJ basin holds great potential for CO2 storage, but not all locations or reservoir targets are suitable. This study focuses on the Lyons Sandstone, viewed by many as a suitable target for CCS (CO2 Capture and Storage). Regional data were used to highlight areas with thicker (mostly eolian) sandstones at suitable temperatures and pressures to hold supercritical CO2. A focus area was identified that contained sufficient well control and core data to perform more detailed, reservoir-scale mapping and petrophysical characterization to build a 3D geocellular model. This resulting geologic model was simulated with CO2 injection to evaluate the impact of reservoir quality variations imparted by the eolian depositional setting. Initial results indicate favorable conditions for CO2 storage, but additional structural and stratigraphic characterization plus drilling and completion concepts is recommended to refine most likely outcomes.
Bio: Jason Eleson is the founder of the GeoIntegra Group, a group of senior geoscientists that specialize in tackling tough energy transition projects with a focus on CCS. He is also the chief geoscientist for the EnergyFuse Group, an advisory team provides industry with state-of-the-art integrated project, technical and commercial services required to plan, design, implement, operate and post-appraise energy transition projects in areas encompassing carbon management, enhanced recovery (EOR) and conventional, and unconventional hydrocarbons. Jason has over 20 years of subsurface experience, and has worked for ExxonMobil, Enverus and Caerus Oil and Gas. He is the current 2nd VP-Elect of RMAG and former president of RMS-SEPM.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
George R. Brown Convention Center
27 Aug–1 Sept 2023
Houston, Texas
Click for more information
Presented by Mark Millard
Rockies Resources LLC.
Abstract:
Evaluation of large-scale resource plays often involves thousands of wells, covering a span of hundreds of miles. Proper characterization requires extremely accurate well logs. For this reasonlog normalization continues to be one of the most important ‘first steps’ in accurate petrophysical evaluation and basin modelling. However, log normalization is often under-appreciated, treated as an enigmatic “black box” workflow, or simply avoided altogether. Even less appreciated or understood is a regional trend-based approach like those pioneered by Doveton and Bornemann (1981) and Kane, et al. (2005).
In this presentation we address the necessity of accurate log normalization, discuss the various methods available, and present a simple workflow for regional trend-based normalization that can be performed on most standard mapping software platforms. The basis of the method is similar to traditional wireline log normalization but takes it a step further by integrating a regionally derived geological trend surface. This novel approach accounts for regional variations in facies, compaction, diagenesis, and man-made variations including log vintage, mud type, and other time-dependent trends.
This specific workflow has been successfully implemented in multiple basins across the United
States and Canada including the Midland, Delaware, San Juan, Powder River, DJ, Uinta, Green River, Paradox, Williston, and Western Canada Sedimentary Basins. In this talk we present the workflow in detail using an example from the Powder River Basin of Wyoming, then present numerous smaller case studies from other basins, highlighting specific challenges and solutions for different rock types, structural and stratigraphic settings, and data vintages. The numerous case studies were not included in the original presentation of the workflow shown at the 2019 RMS-AAPG, and 2020 RMAG luncheon.
This simple approach allows a user to normalize a large set of wells in little time, while accounting for regional geologic variations otherwise ignored by traditional normalization workflows.
References Cited
Doveton J.H., and E. Bornemann, 1981, Log normalization by trend surface analysis: The Log Analyst, v. 22/4, p. 3-8.
Kane, J.A., and J.W. Jennings Jr., 2005, A Method To Normalize Log Data by Calibration to Large-Scale Data Trends: Presented at the SPEAnnual Technical Conference and Exhibition, Dallas, Texas, October 9-12, SPE-96091-MS. http://dx.doi.org/10.2118/96091-MS.
Mark Millard’s Bio
Mark Millard is a Geoscience Manager at Rockies Resources LLC. He has over 15 years of experience in nearly every basin in the Rockies and Texas. He has worked in a multitude of roles from frontier exploration through field development for private PE backed and large public companies. Mark is the author of over 30 papers and/or technical presentations. He currently serves on the Geology Advisory Board for BYU-Idaho, and was previously the President of the Montana Geological Society, and Technical Session Chair for the 2017 RMS-AAPG Annual Conference. He received the A.I. Levorson Award from the RMS AAPG, and the Frank Kottlowski Memorial award from the AAPG Energy and Minerals Division in 2014.
He received his Master’s degree from Baylor University in 2007, and Undergraduate degree from BYU-Idaho in 2005 (Cum Laude). His interests outside of geology include building mandolins, guitars, and violins, playing bluegrass music, and ice hockey.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
Rocky Mountain Section SEPM (Society for Sedimentary Geology) will be holding a Geology Brewery Rendezvous networking event periodically throughout the year.
Presented by Steve Keller and Mark Longman
Abstract
The Castle Rock Conglomerate (CRC) occurs in the Colorado Piedmont, specifically in Douglas and Elbert Counties, and is the uppermost and youngest Cenozoic unit found in that region. Theformation covers a relatively small, northwest-to-southeast-trending area. It is well exposedand topographically prominent, forming flat mesas, steep cliffs, and narrow canyons. The conglomerate is a fluvial unit deposited by a wide braided-stream system. Depositional features such as large-scale cross bedding, large angular blocks of tuff, a variety of lithologies in other clasts, incised channels, fining-upward sequences, and fossil logs are readily observable. Because the conglomerate is both geologically and scenically striking it has interested geologists since the late 1860s.
Improved access to the unit over the last 60 years (e.g., in Castlewood Canyon State Park and in county and municipal open spaces), has increasingly attracted educators, students, and the public. This talk will present a chronology of geologic investigations (description, nomenclature, mapping, and paleocurrent studies) in the unit, and summarize deposition, geologic history, and age as presented by various investigators over the last 150 years, including recent work.
One puzzle that has long gone unstudied is “Why is the CRC so resistant to weathering that it forms these magnificent buttes and canyons?” Petrographic study of some of the finest-grained sandstones in the unit reveal ubiquitous amorphous silica (opal) cements followed in many places by radial-fibrous length fast chalcedony. The opal cements may be either isopachous (indicating precipitation below the water table) or pendant (above the water table), which indicates very early opal precipitation at very shallow, near-surface conditions. The source of the silica is the slightly older Wall Mountain Tuff into which many CRC channels incised. Despite its relatively young age, the hardness and extent of these silica cements account for the CRC being so well exposed in most areas where it is present.
Steve Keller’s Bio
Steve received a B.A. (1972) and an M.S. degree (1974) in geology from the State University of New York and a Professional Master’s degree (1992) in hydrogeology from the Colorado School of Mines (CSM). From 1975 through 2013 he was employed in geologic mapping, minerals exploration and consulting, the Yucca Mountain Project, environmental site investigations, and long-term groundwater monitoring. This work was in many parts of the U.S. and in several foreign countries. From 2007 to 2013 he was a senior associate with Behre Dolbear Minerals Advisors. His association with the Colorado Geological Survey (CGS) began in 2006. With Matthew Morgan (present CGS Director), Steve completed a comprehensive paleocurrent study of the Castle Rock Conglomerate and, with other CGS personnel, contributed to CGS minerals investigations. Beginning in 2016 he has been the lead geologic mapper for seven 7.5’ quadrangles in the northern Colorado Piedmont (mainly late Quaternary alluvial and eolian deposits). Since 2013 he has given a Van Tuyl lecture at CSM, given two Geological Society of America (GSA) conference talks and been coauthor on two others, led a GSA field trip in the Castle Rock Conglomerate, and served as field trip co-chair for the GSA 2016 conference in Denver.
Biosketch for Mark Longman
Mark received his B.A. degree from Albion College (Michigan) in 1972 followed by a Ph.D. in Geology from the University of Texas at Austin in 1976. He then joined the research lab of Cities Service Company in Tulsa, Oklahoma for 5 years before moving to Denver in 1981 to work for Coastal Oil and Gas Company as an exploration geologist in the Williston Basin. From 1984 to 2006, he was a consulting geologist before joining QEP Resources, where he worked as their “Rock Expert” until 2018. Mark then joined the Denver Museum of Nature and Science as a Research Associate and continues to work on various projects with the Museum including his recent work on the Castle Rock Conglomerate. He specializes in the description of cores, outcrops, and petrographic thin sections with a focus on integrating sedimentology and petrology to interpret depositional environments and diagenesis.
This is an in-person and online event!
The cost is $30.00 for current members and $40.00 for non-members. Web only Zoom registration is $10.00 ($5.00 for students). Unemployed individuals may sign up for lunch for just $20.00. Students may sign up for lunch for $20.00. Persons who do not wish to have lunch are welcome for a $20.00 fee. Walk-ins may purchase a lunch for the standard fees ($30.00 or $40.00) although quantities are limited. Walk-ins without a lunch are charged a $15.00 fee.
Please submit reservations by 10:00 a.m. the Friday before the talk.
Reservations may be secured online or by e-mail at information@rmssepm.org
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