Structure and seismic stratigraphy of west and east Cameron and neighboring OCS areas, offshore western Louisiana, Gulf of Mexico /
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| Other Authors: | , , |
| Format: | Thesis Book |
| Language: | English |
| Published: |
1991.
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| Subjects: | |
| Online Access: | ProQuest, Abstract Link to OAKTrust copy |
| Abstract: | This study reports an investigation of the structure and sequence stratigraphy of the Miocene section of offshore western Louisiana in the Gulf of Mexico, based on 2400 miles of seismic data, nannofossil abundance counts from 9 wells, 91 paleontological reports, well logs from 73 wells, 39 check-shot velocity surveys and 8 synthetic seismograms. To the north of 29° 15'N, the area is characterized by west-southwest-trending fault systems in which long, interconnected growth faults with large expansion coincide with paleo-shelfbreaks. Complex salt structures, accompanied by small isolated faults, dominate the area south of 29°15'N. The northern half of the area is free of shallow salt; only a deep salt diapir and a salt anticline occur. Identification of unconformable sequence boundaries using seismic discontinuities is not possible in this area because of the lack of identifiable baselap and expansion at the growth faults. Condensed sections, which usually occur at the top of the transgressive systems tracts and are easily identifiable in nannofossil, well-log, and seismic data, provided an alternative basis for sequence stratigraphic analysis. I recognized eight condensed sections from the late early Miocene through the early Pliocene. Then, I defined stratigraphic sequences, bounded by condensed sections, and their corresponding systems tracts. The highstand systems tracts deposited on the shelf are characterized by variable-to-low amplitudes during high sediment influx and moderate-to-low amplitudes during low sediment influx. The highstand systems tracts are characterized by high amplitude and high continuity downdip of the growth faults, indicating the deposition of turbidites in deep-water environments. Seismic facies of transgressive systems tracts are characterized by high amplitude, high frequency, and moderate continuity... |
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| Item Description: | Typescript (photocopy). Vita. "Major subject: Geophysics." |
| Physical Description: | x, 111 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |