Petroleum Systems of Deep-Water Basins - Gulf Coast Section SEPM

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Determination of Paleogeography and Depositional Environment Within Phosphate Bearing Remnants of the San Pedro del Gallo Terrane in Northeastern Mexico Edgar K. Cross, Jr., Shell Exploration and Production Company One Shell Square, Poydras St. New Orleans, Louisiana Abstract Geochemical and sedimentological data obtained from outcrop localities examined during the present study are presented to explain the origin of bedded phosphatic limestones for selected San Pedro del Gallo terrane remnants (SPGTR) occurring southwest of the Walper Megashear in northeastern Mexico. Three “remnants” of the San Pedro del Gallo terrane (SPGT) (lower Oxfordian to upper Hauterivian) are examined, concentrating on the outer bathyal to upper abyssal La Caja Formation (lower Kimmeridgian to upper Tithonian). During the late Tithonian, a worldwide phosphorogenic episode is recorded from deposits occurring along the western margin of continental masses. In Mexico, a study of the upper Tithonian phosphorite interval (Unit D; Mazapil and Iturbide remnants) has revealed the presence of five phosphatic zones (MPL-1 to MPL-5) from the Mazapil remnant, and three phosphatic zones from the Iturbide remnant (IPL-3 to IPL-5). In addition, three “phosphatic realms” (PR-1, PR-2, and PR-3) occurring in the upper portion of the La Caja Formation within the Mazapil and Iturbide remnants of the SPGT have been assigned. In addition to the PR-zones, the sequence of phosphatic limestone deposition within Unit D from the Mazapil and Iturbide remnants displays geochemical signatures resulting in the identification of three phases or pulses of phosphatic limestone turbidite activity. The paleogeographic configuration of continental masses in the Northern Hemisphere and corresponding paleocurrent configurations, and the depth at which these currents encounter the zone of photosynthesis, along with the effects of nutrient-rich upwelling waters, are proposed as primary limiting factors to the initiation and subsequent termination of bedded phosphorite formation within the San Pedro del Gallo basin. 41
SEAMAGIC or How to SAMBA in South East Asia: Reservoir and Petroleum System Controls, a Tectonic Recompilation and Prospectivity Analysis William G. Dickson DIGs 12503 Exchange Drive, Suite 510A Stafford, Texas 77477 e-mail: info@digsgeo.com Janice M. Christ J-SEA Geoscience 3 Biscay Court The Woodlands, Texas 77381 e-mail: janchrist@usa.net James W. Granath Granath & Associates 14102 Langbourne Drive Houston, Texas 77077 e-mail: granath@attglobal.net Mark E. Odegard Getech (Geophysical Exploration Technology, Inc.) 12946 Dairy Ashford, Suite 250 Sugarland, Texas 77478 e-mail: meo@getech.com Abstract Remarkable correlations between gravity imagery and reservoir distribution have been documented in basins offshore Brasil and West Africa in a simple passive margin setting. The present group has tackled Southeast Asia, and its much more complicated plate history, placing the petroliferous basins in a clearer tectonic framework. We used a GIS environment to enable faster and more precise interpretation methods and digital presentation of results. First we correlated published geological features to gravity and magnetic anomalies displayed as geotiffs (geo-referenced images). We reinterpreted, realigned and extrapolated even long-recognized features not previously imaged in their entirety, due to inadequate data coverages. We refined the location and extents of many first-order tectonic features through their gravity/magnetic signatures, including the Red River, Three Pagodas and other faults, the outlines of most of the Tertiary basins, and various discovery trends. Our results contrast examples from the Campos and Lower Congo basins (showing sediment distribution controls by basement faulting and salt-involved compression respectively) with both extensional and compressional regimes in Southeast Asia. In each region, potential field signatures suggested relationships that explained reservoir distribution or controls on petroleum systems. While mapping terrane boundaries, we also reinterpreted extents of continental, oceanic and proto-oceanic crust and their depths, with natural consequences for hydrocarbon maturation modeling. Side benefits of a GIS approach are: (1) the ease with which multiple data sets from participants can be integrated and updated; and, (2) improved corporate memory as the project evolves. 42
Page 2 and 3:
Petroleum Systems of Deep-Water Bas
Page 4 and 5:
Foreword The search for petroleum t
Page 6 and 7: Gulf Coast Section Society of Econo
Page 8 and 9: Contributors to the Gulf Coast Sect
Page 10 and 11: Credits Book Layout, Cover Design,
Page 12 and 13: 10:00 a.m. Wood, Lesli J.: ........
Page 14 and 15: 3:30 p.m. Roberts, Harry H., Roger
Page 16 and 17: World-Wide Deep Water Exploration a
Page 18 and 19: Mesozoic Ultra-Deep Water Potential
Page 20 and 21: Regional Mapping and Maturity Model
Page 22 and 23: Basement Controls on Hydrocarbon Sy
Page 24 and 25: Kinematic Evolution of the Gulf of
Page 26 and 27: New Oceanographic Observations of t
Page 28 and 29: Examples of Deep-Water Salt Tectoni
Page 30 and 31: Exploration in Deep Water Basins…
Page 32 and 33: Stratigraphic and Tectonic Framewor
Page 34 and 35: Based on oil-to-seep correlations,
Page 36 and 37: Subsalt Exploration Trap Styles, Wa
Page 38 and 39: The Petroleum System of the Western
Page 40 and 41: The Northern Angolan Margin Imaged
Page 42 and 43: Mesozoic Carbonate Petroleum System
Page 44 and 45: Phase Changes: A Major Aspect of De
Page 46 and 47: The Past and Future Exploration Pot
Page 48 and 49: On the Importance of Understanding
Page 50 and 51: Obstacle and Sinks: Effects on Turb
Page 52 and 53: Potential Deep Water Petroleum Syst
Page 54 and 55: Capillary Seals as a Cause of Press
Page 58 and 59: Gas Capillary Inhibition to Oil Pro
Page 60 and 61: Processes Impacting Deep Water, Sub
Page 62 and 63: Transtension Along an Ancient Linea
Page 64 and 65: Economic Potential of the Yucatan B
Page 66 and 67: Gulf of Cadiz (Western Spain): Char
Page 68: Complex Petroleum Systems Developed
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Petroleum Systems of Deep-Water Basins - Gulf Coast Section SEPM

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