Geology of the fractured Austin and Buda formations in the subsurface of south Texas
Where the systems of fractures in the Austin chalk or Buda lime are numerous and extensive or when swarms of mirco-fractures or some matrix porosity is found containing oil, then not only will there be a good initial production, but the stabilized level of production will be established at a high and satisfying rate. When few fractures are penetrated and porosity or the very fine fractures are scarce then a poor well can be expected. There are interesting exceptions to these patterns. Deeper structural geology and seismology has indicated favorable areas of fracturing in the Austin. These areas which indicate buried ridges, old faults or salt pillows in the lower Cretaceous and Jurassic serve to make local differential compaction or strain fractures in the Austin chalk and Buda lime. Zones of weakness often are found in parallel pairs (or more) or alignments. There are cases of secondary sets of fractures running at 40 to 80 to prevailing alignments and running up-dip and down-dip to the strike of the Austin chalk. 30 references.
- OSTI ID:
- 5872044
- Journal Information:
- Trans., Gulf Coast Assoc. Geol. Soc.; (United States), Journal Name: Trans., Gulf Coast Assoc. Geol. Soc.; (United States) Vol. 27; ISSN TGCGA
- Country of Publication:
- United States
- Language:
- English
Similar Records
1974 Austin Cretaceous discovery opened new frontiers in south Texas
Horizontal exploitation of the Upper Cretaceous Austin Chalk of south Texas
Related Subjects
020200* -- Petroleum-- Reserves
Geology
& Exploration
CARBONATE ROCKS
CRETACEOUS PERIOD
FEDERAL REGION VI
FRACTURED RESERVOIRS
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGY
JURASSIC PERIOD
LIMESTONE
MESOZOIC ERA
MINERAL RESOURCES
NORTH AMERICA
OIL WELLS
PETROLEUM DEPOSITS
POROSITY
PRODUCTION
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SEDIMENTATION
SEISMOLOGY
STRATIGRAPHY
TESTING
TEXAS
USA
WELL COMPLETION
WELLS