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Abstract
Gomez-Cabrera, P. T., and M. P. A. Jackson,
DOI:10.1306/13191086M9037
2009 by The American Association of Petroleum Geologists.
Neogene Stratigraphy and Salt Tectonics of the Santa Ana Area, Offshore Salina del Istmo Basin, Southeastern Mexico
Pedro T. Gomez-Cabrera,1 Martin P. A. Jackson2
1Petroleos Mexicanos (PEMEX), Activo Integral Bellota-Jujo, Comalcalco, Tabasco, Mexico
2Bureau of Economic Geology, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas, U.S.A.
ACKNOWLEDGMENTS
We thank the following for their contributions: Petroleos Mexicanos provided the data and permitted publication. William L. Fisher cosupervised the Ph.D. dissertation (Gomez-Cabrera, 2003) on which this article was based and provided valuable stratigraphic insights. Peer reviewers Mark Rowan and Lou Liro provided a wealth of cogent suggestions for improving the article. Contributions by the second author (M.P.A.J.) were funded by the Applied Geodynamics Laboratory consortium of oil companies and by the Jackson School of Geosciences. Midland Valley supplied 2DMove restoration software, and Halliburton provided Landmark's SeisWorks interpretation software. Nancy Cottington drew the illustrations, and Lana Dieterich edited the manuscript. The chapter is published by permission of the director, Bureau of Economic Geology, Jackson School of Geosciences, the University of Texas at Austin.
ABSTRACT
The Santa Ana area in the Bay of Campeche features a complex Neogene interaction of sedimentation, salt-related deformation, and regional tectonics. We synthesized this interaction using three-dimensional seismic data and logs and paleontological data from six wells. These provide a tectonostratigraphic framework for seven Neogene sequence-stratigraphic boundaries between 12.5 and 1.4 Ma. We analyzed these data using seven isochore maps, two restored cross sections, and a geohistory plot. The Neogene history begins with the Agua Dulce fold belt, which formed between 8.0 and 6 Ma. As the Agua Dulce folding waned, at about 6 Ma, extrusive salt blanketed much of the late Miocene fold belt. Sediment loading began to redistribute this allochthonous salt immediately after the discontinuous canopy was emplaced. Thin overburden sags may have originated as synclines during the waning stages of regional buckling, which also gently deformed the base of the salt canopy. After 3.8 Ma, the mean sedimentation rate more than doubled to 0.7 mm/yr (0.03 in./yr) as sediments became trapped against extensional, mostly counterregional, faults. Between 2.6 and 2.4 Ma, mean aggradation rates increased as much as sixfold to 4 mm/yr (0.16 in./yr) as major extension continued. A north block remained partly starved of sediment whereas depocenters formed proximally because of underlying salt evacuation. After 2.4 Ma, mean aggradation rates fell to 1 mm/yr (0.04 in./yr), probably because the shelf break crossed the study area. The boundary between thick distal sediment and thin proximal sediment shifted northward as the shelf edge prograded. Some depocenters merged in depressions in counterregional hanging walls. After 1.4 Ma, the north and west blocks acted as one, tilting seaward and accommodating the thickest strata.
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