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  1. Sequence Stratigraphy of the South Texas Oligocene: Understanding the Relationship Between Shale Tectonism and Lowstand Deposition R. Treviño, L.F. Brown, R. Loucks, and U. Hammes Bureau of Economic Geology Jackson School of Geosciences The University of Texas at Austin

  2. A New Depositional Model for the Frio / Vicksburg

  3. Overview • Location • South Texas Growth-Faulted Subbasins • Stratigraphy – Structure Interplay • Dynamic Model • Exploration Potential

  4. Location Map

  5. Seismic Line in Corpus Christi Bay


  6. Schematic representation - successive growth-faulted intraslope subbasins Organization Repetition

  7. Organization of sands (after Mitchum and Van Wagoner, 1991)

  8. Origin of Growth-Faulted Subbasins Related to the interaction of: - gravity tectonics, - relative sea-level changes, - and sediment supply. Feedback

  9. Wireline-log sequence stratigraphy Basin-floor fans

  10. Wireline-log sequence stratigraphy Slope fans

  11. Wireline-log sequence stratigraphy Lowstand prograding wedge

  12. Wireline-log sequence stratigraphy Lowstand prograding wedge

  13. Organization of sands

  14. Early Lowstand Systems Tract Incised valleys commonly erode at fault intersections Lowstand systems tract Incised-valleys Slope upper - lower LST Prograding Wedges Pelagic deposition ~20 to 40 miles Depositional systems after Galloway et al., 1982

  15. Schematic representation of successive growth-faulted intraslope subbasins

  16. Dynamic Depositional Model

  17. Conclusions • Offshelf Lowstands overload slope • Growth-faulted subbasins younger basinward • Similar log facies, different subbasins = different time • Deep Potential

  18. Western Geco – Seismic Sabco IBC (now Boss Exploration) Acknowledgements

  19. STARR PROGRAM State of Texas Advanced Resource Recovery

  20. Organization of sands (after Mitchum, 1991)

  21. A n a h u a c H S T Organization: Seismic view

  22. Organization Schematic representation of successive growth-faulted intraslope subbasins

  23. Regional dip cross section using S5 logs Paleo control

  24. Isochron map of lowstand prograding wedges Sediment input (incised valleys) axes

  25. Incised valley feeder systems Isopach map of lowstand prograding wedges

  26. Isopach map of lowstand incised-valley fills

  27. Cross section of incised-valley fills (lowstand)

  28. Wireline-log sequence stratigraphy Lowstand incised-valley fill, transgressive, and highstand systems tracts

  29. Wireline-log sequence stratigraphy Lowstand incised-valley fill, transgressive, and highstand systems tracts

  30. Red Fish Bay S5-Benchmark Chart

  31. Section of Red Fish Bay S5-Benchmark Charts

  32. Regional correlations of sands So, how do you correlate between subbasins?

  33. Regional dip cross section using S5 logs

  34. Site-Specific Sequence-Stratigraphic Section Benchmark Charts (S5 Benchmark Charts) • Composite logs with • Sequence stratigraphy • additional data • summarize subbasin geology • Promote accurate correlations

  35. Shelf edge +/-1000ft ~3000-4000ft Stage in development and filling of growth-faulted intraslope subbasins: Stage 1

  36. Turbidity flow Stage in development and filling of growth-faulted intraslope subbasins: Stage 2

  37. Turbidity flow Stage in development and filling of growth-faulted intraslope subbasins: Stage 3

  38. Turbidity flow Mobilized basinal shales forming incipient shale ridge Stage in development and filling of growth-faulted intraslope subbasins: Stage 4

  39. Incised valleys Termination of slope fan deposition Stage in development and filling of growth-faulted intraslope subbasins: Stage 5

  40. ivf Stage in development and filling of growth-faulted intraslope subbasins: Stage 6

  41. Stage in development and filling of growth-faulted intraslope subbasins: Stage 7

  42. Schematic representation of successive shifting LST depocenters

  43. Schematic representation of successive shifting LST depocenters

  44. Schematic representation of successive shifting LST depocenters

  45. Schematic representation of successive shifting LST depocenters

  46. Schematic representation of successive shifting LST depocenters