Virtual Landscapes of Texas

Table of Contents

1. Stuart City trend, Lower Cretaceous, south Texas : a carbonate shelf-margin model for hydrocarbon exploration
   1. Summary
   
   
   2. Introduction
   
   
   3. General Remarks
   
   
   4. Objectives
   
   
   5. Paleogeographic Setting—South Texas
   
   
   6. General Geologic History
   
   
   7. Environments
   
   
   8. Facies
   
   
   9. General Remarks
   
   
   10. Facies Descriptions
   
   
   11. Miliolid wackestone
   
   
   12. Mollusk wackestone
   
   
   13. Toucasid wackestone
   
   
   14. Mollusk-miliolid grainstone
   
   
   15. Algae-encrusted miliolid-coral-caprinid packstone
   
   
   16. Rudist grainstone
   
   
   17. Requienid boundstone
   
   
   18. Coral-caprinid boundstone
   
   
   19. Caprinid-coral wackestone
   
   
   20. Coral-stromatoporoid boundstone
   
   
   21. Intraclast grainstone
   
   
   22. Echinoid packstone
   
   
   23. Echinoid-mollusk wackestone
   
   
   24. Planktonic foraminifer wackestone
   
   
   25. Distribution of Facies
   
   
   26. Dip section B-B'
   
   
   27. Dip section C-C'
   
   
   28. Dip section D-D'
   
   
   29. Dip section E-E'
   
   
   30. Diagenesis
   
   
   31. Cement from Direct Precipitation
   
   
   32. Dripstone (precipitated laminated crust)
   
   
   33. Isopachous cement (precipitated fibrous crust)
   
   
   34. Radiaxial cement (precipitated bladed crust)
   
   
   35. Precipitated equant calcite
   
   
   36. Neomorphic Calcite
   
   
   37. Neomorphic equant calcite
   
   
   38. Impure neomorphic calcite
   
   
   39. Timing of Diagenesis
   
   
   40. Porosity Types and Distribution
   
   
   41. Materials and Procedures
   
   
   42. Acknowledgments
   
   
   43. References
   
   
2. Illustrations
   1. Untitled
   
   
   2. Figure 1. Distribution of Lower Cretaceous shelf-margin facies around the Gulf of Mexico
   
   
   3. Figure 2. Paleogeography of the Lower Cretaceous of Texas
   
   
   4. Figure 3. Seismic section across the Stuart City and Sligo shelf margins in the southern part of the study area
   
   
   5. Figure 4. Correlation of Lower Cretaceous formations, western Gulf of Mexico
   
   
   6. Figure 5. Rudist types which are significant contributors to the sediments of the Lower Cretaceous of South Texas
   
   
   7. Figure 6. Facies sequence in the deep-penetrating wells along the Stuart City Trend
   
   
   8. Figure 7. Facies and interpreted depositional environments across the Stuart City Trend, South Texas
   
   
   9. Figure 8. Stuart City Trend, South Texas, showing locations of the wells from which cores were obtained for this study
   
   
   10. Figure 9. Induction-electrical log cross section along the Stuart City Trend, South Texas
   
   
   11. Figure 10. Miliolid wackestone
   
   
   12. Figure 11. a, b. Mollusk wackestone; c, d. Toucasid wackestone
   
   
   13. Figure 12. Mollusk-miliolid grainstone
   
   
   14. Figure 13. Mollusk-miliolid grainstone
   
   
   15. Figure 14. Mollusk-miliolid grainstone
   
   
   16. Figure 15. Algae-encrusted miliolid-coral-caprinid packstone
   
   
   17. Figure 16. Algae-encrusted miliolid-coral-caprinid packstone
   
   
   18. Figure 17. Algae-encrusted miliolid-coral-caprinid packstone
   
   
   19. Figure 18. Rudist grainstone
   
   
   20. Figure 19. Vertical sequence of internal structures in a single grainstone body.
   
   
   21. Figure 20. Rudist grainstone
   
   
   22. Figure 21. Requienid boundstone
   
   
   23. Figure 22. Coral-caprinid boundstone
   
   
   24. Figure 23. Caprinid-coral wackestone
   
   
   25. Figure 24. Coral-stromatoporoid boundstone
   
   
   26. Figure 25. a, b. Intraclast grainstone; c. Echinoid packstone; d, e. Echinoid-mollusk wackestone
   
   
   27. Figure 26. Planktonic foraminifer wackestone
   
   
   28. Figure 27. Facies cross section A-A'
   
   
   29. Figure 28. Facies cross section B-B'
   
   
   30. Figure 29. Facies cross section C-C'
   
   
   31. Figure 30. Facies cross section D-D'
   
   
   32. Figure 31. Facies cross section E-E'
   
   
   33. Figure 32. Micrite rims Dripstone cement.
   
   
   34. Figure 33. Meniscus and dripstone cement
   
   
   35. Figure 34. Dripstone cement
   
   
   36. Figure 35. Isopachous cement
   
   
   37. Figure 36. Radiaxial cement
   
   
   38. Figure 37. Radiaxial cement
   
   
   39. Figure 38. Radiaxial cement
   
   
   40. Figure 39. Neomorphic equant calcite
   
   
   41. Figure 40. Neomorphic impure calcite
   
   
   42. Figure 41. Sequence of cement types in the rudist grainstone
   
   
   43. Figure 42. Timing of diagenesis
   
   
   44. Figure 43. Primary intraparticle porosity
   
   
   45. Figure 44. Secondary porosity