PBS-SEPM March 15th Luncheon Meeting

“Oceanographic and eustatic control of carbonate platform evolution and sequence stratigraphy on the Cretaceous (Valanginian–Campanian) passive margin, northern Gulf of Mexico”

 

ABSTRACT

 

An integrated study based on outcrop, core, chemostratigraphic, and wireline log data documents the combined impact of Cretaceous eustacy and oceanic anoxic events on carbonate platform morphology and facies distributions in the northern Gulf of Mexico. The diverse facies and abundant data of the Comanche platform serve as a nearly complete global reference section and provide a sensitive record of externally driven oceanographic conditions affecting Cretaceous platform development. Regional cross-sections across the shoreline to shelf-margin profile provide a detailed record of mixed carbonate-siliciclastic strata for the Hauterivian through lower Campanian stages (~136-80 Ma). The study also documents the impact of oceanic anoxic events and global eustacy on deposition of the Hosston Formation through Austin Chalk along the San Marcos Arch of central Texas. Changing reef margin facies patterns and architecture are examined in relation to shelf interior lithologies and oceanographic changes. Three second-order supersequences comprised of eight composite sequences are recognized in the Valanginian-Barremian, the Aptian-Albian, and the Cenomanian-Campanian. Oceanic anoxic events 1a, 1b, 1d, and 2 occurred immediately before, after, or during shale deposition in the Pine Island Member, Bexar Member, Del Rio Formation, and Eagle Ford Group, respectively. Oceanic anoxic event 3 corresponds to deposition of the Austin Chalk Group. Each period of oceanic anoxia is associated with composite sequence maximum flooding, termination of carbonate shelf sedimentation, and deposition of condensed shale units in distally-steepened ramp profiles. Using chemo- and sequence-stratigraphic

 

PLEASE REMEMBER TO MAKE YOUR RESERVATION NO LATER THAN MONDAY, MARCH 14TH AT 3PM.  LUNCH WITH RESERVATIONS IS $20 LUNCH WITHOUT RESERVATION IS $30.  NO SHOWS WILL BE INVOICED.

Speaker: Dr. Ryan Phelps
Speaker Dr. Ryan Phelps
Ryan Phelps is a carbonate geologist currently employed by ConocoPhillips in Houston, TX. He graduated with a BS degree from Trinity University in San Antonio, TX where he studied Holocene lacustrine sedimentology and paleobiology (2004). He then completed an MS degree in carbonate sedimentology-stratigraphy at The University of Texas at ...

Ryan Phelps is a carbonate geologist currently employed by ConocoPhillips in Houston, TX. He graduated with a BS degree from Trinity University in San Antonio, TX where he studied Holocene lacustrine sedimentology and paleobiology (2004). He then completed an MS degree in carbonate sedimentology-stratigraphy at The University of Texas at Austin (2006) with a focus on outcrop sequence stratigraphy in the Permian San Andres Formation of the Guadalupe Mtns. Ryan then began a doctoral program and completed a PhD at The University of Texas at Austin (2011). Research efforts focused on Cretaceous subsurface sequence stratigraphy in south-central Texas and the relationships between shelf and reef margin facies patterns. In addition, he documented the impact of multiple Oceanic Anoxic Events (OAE’s) on the development of the carbonate platform. His recent work with ConocoPhillips initially focused on reservoir characterization and karst prediction within multiple San Andres and Grayburg fields of the Permian Basin. Subsequent efforts were devoted to description and reservoir quality analysis of the Eagle Ford shale, Austin Chalk, and Niobrara Formation. His current assignment within the Williston Basin Reservoir Characterization team has led to extensive study of reservoir properties in Bakken and Three Forks reservoirs.

Full Description
Organizer Permian Basin Section - SEPM

When?

Tue, March 15, 2016
11:30 a.m. - 1 p.m.
(GMT-0500) US/Central

Event has ended

Where?

Midland Country Club Upstairs Ballroom
6101 N. Highway 349
Midland, TX 79705
United States