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Our Next Luncheon Talk

(11:30 Reception; 11:45 Lunch; 12:15 Talk)


The next talk of the 2019 RMS-SEPM Luncheon Lecture Series will be held on Tuesday, February 26, 2019.

New insights and discoveries of the Permian Lyons sandstone, DJ Basin, Colorado

Marshall Deacon

Edge Energy Inc


11:30 Reception, 11:45 Lunch, 12:15 Talk
at the
Wynkoop Brewing Company
1634 18th St., Denver, CO

The cost is $25.00 for current members and $35.00 for non-members ($10 of which pays for an annual RMS-SEPM membership). Unemployed individuals may sign up for lunch for just $10.00. Persons who do not wish to have lunch are welcome for a $10.00 fee. Walk-ins may purchase a lunch for the standard fees ($25.00 or $35.00) although quantities are limited. Walk-ins without a lunch are charged a $10.00 fee.

Please submit reservations by 10:00 a.m., the Friday before the talk.

After the reservation deadline, you may attend the talk for a $10.00 "walk-in" fee. Reservations may be secured online, by e-mail at
or by calling Robin Swank at 720-272-6697


The Permian Lyons sandstone of NE Colorado has received quite the interest over the last 150 years for its use as a building and patio stone, its iconic hogback outcrops and park lands, and high permeability oil reservoirs. From the first oil discovery in the mid 50’s to the present, Rocky Mountain operators have had their sights on the Lyons in the DJ. Noble Energy started a drilling program in 2010 and had the first significant new discovery in the Lyons in over 30 years. That was followed by two additional new field discoveries. Very little has been published on the Lyons since those early discoveries, but with hundreds of newer well penetrations and large 3D seismic shoots, new opportunities have come to light.

A rich dataset of outcrop, well logs, cuttings, cores, production and 3D seismic reveal a complex depositional, diagenetic, and oil -filling history. Deposition was primarily by wind transported sediment in a coastal plain setting that extended from near-shore sabkha environments to the east to large dune and fluvial environments adjacent to the Ancestral Rockies to the west. Inter-bedding of sabkha, sand sheet, dune and fluvial deposits result in a complex reservoir architecture. The depositional environment also had a strong impact on the diagenetic phases from early anhydrite dominated cement in the east to calcite and silica cements in the west. The early diagenetic phase is interpreted to have had the largest effect on the preservation and creation of original and secondary porosity.
The oil-filling history of the Lyons and its relationship to the structural, depositional and diagenetic history is complicated. The source of the oil is undocumented with both a western Phosphoria and eastern Pennsylvanian source hypothesized. Oil staining in the cores consists of a black residual oil, a brown oil and a light tan oil stain often separated at facies boundaries. Staining can be up to 100’ thick implying oil columns significantly greater than exists presently. At least two hydrocarbon filling events are postulated and trapping is by structure, stratigraphy and diagenesis.


Speaker Biography:

Originally from western Oregon, Marshall followed in his fathers’ footsteps and studied geology at Oregon State University. Having enough of volcanic rocks, he moved on to graduate school at Northern Arizona University to study fluvial and eolian strata on the Colorado plateau. First job took him to the North Slope of Alaska and Prudhoe Bay and then to Norway and the North Sea. Arriving in Denver during the downturn of ‘98 led to some challenging times but has kept busy working exploration and development for Encana, Bonanza Creek, and Noble Energy and now with a small outfit out of Golden – Edge Energy. He spends most of his geology time on the Cretaceous source rocks and reservoirs of the DJ Basin but any sedimentary rock with a good outcrop is hard to pass up.



Speaker List

Click on the talk title for a PDF version of the abstract.


Jan 29

William Drake

Regional Mapping of Organic Porosity: Pros and Cons of an Exploration Tool, Permian Basin

Feb 26

Marshall Deacon

New insights and discoveries of the Lyons sandstone, DJ Basin, Colorado

Mar 26

Charlie Harman

Quantified Facies Distribution and Sequence Geometry of the Yates Formation, Slaughter Canyon, New Mexico

Apr 23

Mark Longman and Barbara Luneau

Revisiting the Upper Cretaceous Niobrara Petroleum System in the Rocky Mountain Region

Jun 4

Lisa Stright

Template-based Modeling: Bridging the gap between quantitative outcrop studies and subsurface reservoir characterization


No Luncheon - Summer Break

Aug 27

Jason Eleson


Sept 24



Oct 24

Ali Jaffri

Virtual Field Trip to the Persian Gulf

Nov 26

Ellen Wilcox



No Luncheon - Winter Break


In order to keep our Luncheon Program solvent and operating on schedule,
the RMS-SEPM Board has adopted the following guidelines for reservations and seating at the Wynkoop:

  • Reservations for this Luncheon Talk will be closed at 10:00am on Friday, before the talk. (No reservations are needed for walk-ins.)