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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
Abstract
AAPG Bulletin, V.
Integrated approach to condensed section identification in intraslope
basins, PliocenePleistocene, northern Gulf of Mexico (E & P Notes)
Jennifer R. Crews,1 Paul Weimer,2 Andrew J. Pulham,3 Arthur S.
Waterman4
1Energy and Minerals Applied Research Center, Department of
Geological Sciences, University of Colorado, Boulder, Colorado 803090399; present
address: Texaco Exploration, 4800 Fournace Place, Bellaire, Texas 77401; email: [email protected]
2Energy and Minerals Applied Research Center, Department of Geological
Sciences, University of Colorado, Boulder, Colorado 803090399; email: [email protected]
3Energy and Minerals Applied Research Center, Department of Geological
Sciences, University of Colorado, Boulder, Colorado 803090399; email: [email protected]
4Paleo-Data, Inc., 6619 Fleur de Lis Drive, New Orleans, Louisiana 70124;
email: [email protected]
AUTHORS
Jennifer Crews is currently working as an exploration geologist
in the Deepwater Gulf of Mexico Business Unit at Texaco Exploration, Bellaire, Texas. She
received her B.A. degree in 1995 and her M.S. degree in geology in 1998 from the
University of Colorado at Boulder. Her research interests include applied biostratigraphic
methods and sequence
analysis
.
Paul Weimer holds the Bruce D. Benson Endowed Chair in Petroleum
Geology in the Department of Geological Sciences at the University of Colorado at Boulder
and is director of the Energy and Minerals Applied Research Center. His research interests
are in sequence
stratigraphy, reservoir geology, and petroleum systems of deep-water
continental margins.
Andy Pulham has a B.Sc. in physical geography and geology from Liverpool University, United Kingdom, and a Ph.D. in geology from the University of Wales, United Kingdom. After graduating, he spent 12 years as an international petroleum sedimentologist for British Petroleum. He has worked in the North Sea and South America and spent over three years in Houston working the deep-water Gulf of Mexico. Currently, Pulham is leading a reservoir geology research consortium within the Energy and Minerals Applied Research Center in Boulder, Colorado. Andy will be an AAPG Distinguished Lecturer for 20002001.
Art Waterman is executive vice president of Paleo-Data, Inc., a biostratigraphic consulting firm in New Orleans. Previously, Art worked as a development geologist and paleontologist for Texaco. Since 1985 Art has specialized in Cenozoic calcareous nannoplankton biostratigraphy. He received his B.S. degree from St. Lawrence University and his M.S. degree in geology from Indiana University in 1975.
ACKNOWLEDGMENTS
We thank the following people for their help and input with this project: George Clemenceau (BP-Amoco), Anthony C. Gary (EGI, University of Utah), Garry D. Jones (Spirit Energy), and Jim Ragsdale (Agip). We thank the University of Colorado Gulf of Mexico consortium sponsors for their support and input: Agip, Amerada Hess, Amoco, Anadarko, Baker-Hughes E and P Solutions, BHP, BP, Burlington, Conoco, CXY, Enterprise, Exxon, Landmark, LLE, Marathon, Maxus, Midland Valley, Mobil, Occidental, Paleo-Data, Paradigm Geophysical, Phillips, Platte River Associates, Shell, Texaco, Unocal, Union Pacific, and Vastar. We thank Halliburton (now Western Geophysical) for use of their seismic data, and Davis Ratcliff and Diamond Geophysical for permission to reproduce a seismic profile. David Knapp and John Roesink provided invaluable input on computer matters. We thank AAPG reviewers Garry Jones, Brian O'Neill, and elected editor Neil Hurley for their careful reviews that improved the manuscript.
ABSTRACT
In this article we present a series of techniques for identifying
condensed sections on wire-line logs for sediments deposited in intraslope basins. A
sequence
stratigraphic framework can be developed quickly by integrating high-resolution
biostratigraphic data from wells having wire-line logs, mud logs, and seismic data. We
developed these techniques from working with PliocenePleistocene sediments of the
northern Gulf of Mexico.
We recognize two major types of condensed sections: carbonate-rich
condensed sections (CRCS) and shale-rich condensed sections (SRCS). Paleontologically,
both CRCS and SRCS are characterized by high calcareous nannofossil and foraminiferal
relative abundance and an increase in diversity. The CRCS have a low gamma-ray
(siliciclastic sand) signature and high spontaneous potential (SP) (at or near shale
baseline) wire-line log
response. The SRCS are characterized by gamma-ray and SP responses
that are approximately at the shale baseline or slightly higher on wire-line logs. These
two types of condensed sections can occur within the same depositional
sequence
,
suggesting multiple factors controlling the kinds of sediments deposited within a
condensed section.
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