- journal_title：AAPG Bulletin
- Contributor：Jennifer R. Crews ; Paul Weimer ; Andrew J. Pulham ; Arthur S. Waterman
- Publisher：American Association of Petroleum Geologists (AAPG)
- Date：2000-
- Format：text/html
- Language：en
- Identifier：10.1306/8626BEE3-173B-11D7-8645000102C1865D
- journal_abbrev：AAPG Bulletin
- issn：0149-1423
- volume：84
- issue：10
- firstpage：1519
- section：E and P Notes
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 Pliocene-Pleistocene 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.