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Geologic Note |
1 Bureau of Economic Geology, John A. and Katherine G. Jackson School of Geosciences, University of Texas at Austin, University Station, Box X, Austin, Texas 78713-8924; frank.brown{at}beg.utexas.edu
2 Bureau of Economic Geology, John A. and Katherine G. Jackson School of Geosciences, University of Texas at Austin, University Station, Box X, Austin, Texas 78713-8924; bob.loucks{at}beg.utexas.edu
3 Bureau of Economic Geology, John A. and Katherine G. Jackson School of Geosciences, University of Texas at Austin, University Station, Box X, Austin, Texas 78713-8924; ramon.trevino{at}beg.utexas.edu
Frank Brown received his B.S. degree in geology and chemistry from Baylor University in 1951 and his M.S. degree and his Ph.D. from the University of Wisconsin, Madison, in 1953 and 1955, respectively. Frank has worked for Standard Oil of Texas (Chevron) (1955–1957), the Bureau of Economic Geology (BEG) (1957–1960 and 1966–1989), and as an international consultant (1989–1999). From 1960 to 1966, he was associate professor at Baylor University. He was professor of geological sciences at the University of Texas at Austin (1971–1989) and emeritus professor (1989–2005). Since 1999, he has been a research professor at BEG, where he continues his studies of the sequence stratigraphy of the Gulf Coast of Texas and Mexico.Robert Loucks is a senior research scientist at the Bureau of Economic Geology, working on siliciclastic and carbonate reservoir characterization. He was the recipient of the 1999 AAPG Wallace E. Pratt Memorial Award for Best Paper, the 1982 SEPM Excellence of Presentation Award, and the 1991 SEPM Excellence of Poster Presentation Award. Bob served as the Mideast AAPG Dean A. McGee International Distinguished Lecturer in 1999.
Ramón Treviño received his B.S. degree in geology (Texas A&I University, 1983) and his M.S. degree in geology (University of Texas at Arlington, 1988). He worked for Mobil from 1988 to 1992 and received an M.B.A. from the University of Oklahoma in 1994. Since 1995, he has worked on sequence-stratigraphic reservoir characterization at the Bureau of Economic Geology.
Subbasins composing a larger basin can have similar appearing sediment fills that are diachronous. It is important to construct a chronostratigraphic section for each subbasin to correctly correlate between subbasins. A methodology is presented that incorporates the sequence-stratigraphic interpretation of each subbasin, which improves correlation of systems tracts between adjacent and widely separated subbasins. The growth-faulted subbasins in the Corpus Christi Bay area along the western margin of the Gulf of Mexico are used to demonstrate this methodology.
A composite wire-line log created by splicing unfaulted and relatively conformable log segments from the deepest wells in an area provides a stratigraphic record that captures a complete succession of depositional and cyclic history. Site-specific sequence-stratigraphic section (S5) benchmark charts are composite logs containing additional data that summarize available geologic information for a subbasin, site-specific area. Color-coded sequences and component systems tracts are basic information displayed on S5 benchmark charts. This physical framework can then be calibrated with ages (Ma) of sequences and bounding surfaces. Ages are based on geologic time charts representing latest consensus from isotopic, polarity, and microfossil integration. Sequence-bounding unconformities and internal maximum flooding surfaces delineated on S5 benchmark charts, when correlated with other wire-line logs and placed into the seismic time domain, produce a chronostratigraphic framework for an area. Comparison of S5 benchmark charts among adjacent, widely spaced, or isolated sites facilitates correlation of diachronous lithostratigraphic units.
This article has been cited by other articles:
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  R. H. Trevino and B. C. Vendeville Origin of coast-perpendicular extensional faults, western Gulf of Mexico: The relationship between an early-stage ridge and a late-stage fault AAPG Bulletin, July 1, 2008; 92(7): 951 - 964. [Abstract] [Full Text] [PDF]
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H. Zeng, R. G. Loucks, and L. Frank Brown Jr. Mapping sediment-dispersal patterns and associated systems tracts in fourth- and fifth-order sequences using seismic sedimentology: Example from Corpus Christi Bay, Texas AAPG Bulletin, July 1, 2007; 91(7): 981 - 1003. [Abstract] [Full Text] [PDF]
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L. F. Brown Jr., R. G. Loucks, R. H. Trevino, and U. Hammes Understanding growth-faulted, intraslope subbasins by applying sequence-stratigraphic principles: Examples from the south Texas Oligocene Frio Formation: Reply AAPG Bulletin, May 1, 2006; 90(5): 799 - 805. [Full Text] [PDF]
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