Factors controlling porosity and permeability in geopressured Frio sandstone reservoirs, general crude oil/Department of Energy Pleasant Bayou test wells, Brazoria County, Texas
Reservoir characteristics of Frio sandstones in the GCO/DOE Pleasant Bayou No. 1 and No. 2 wells are influenced by depositional environment, sandstone composition, and diagenetic history. The sandstones and shales were deposited in deltaic and continental slope environments. Fluvial channel and distributary-mouth bar sandstones are most favorable for development and preservation of the porosity needed for a geothermal reservoir. Sandstones in the geopressured zone are lithic arkoses and feldspathic litharenites. Depositional matric (detrital material less than 20 micrometers in size) occluded most or all of the potential primary porosity between grains in many of the fine-grained sandstones at the time of deposition. Even if cements are present, dissolution of grains and development of secondary porosity do take place. Permeable geopressured sandstone reservoirs are characterized by porosity that is dominantly secondary. 12 references.
- OSTI ID:
- 6060550
- Journal Information:
- Texas Univ. Bureau Economics Geology, US Gulf Coast Geopressured-Geothermal Energy Research and Development Conference; (United States), Journal Name: Texas Univ. Bureau Economics Geology, US Gulf Coast Geopressured-Geothermal Energy Research and Development Conference; (United States) Vol. 1
- Country of Publication:
- United States
- Language:
- English
Similar Records
Fluid movement and diagenesis in fine-grained geopressured sediments of Frio Formation (Oligocene), Kaplan field, southwestern Louisiana
Saline fluid flow and hydrocarbon migration and maturation as related to geopressure, Frio Formation, Brazoria County, Texas
Related Subjects
150200* -- Geology & Hydrology of Geothermal Systems
DEPOSITION
DIAGENESIS
ENERGY SYSTEMS
EXPLORATORY WELLS
FEDERAL REGION VI
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
GEOPRESSURED SYSTEMS
GEOTHERMAL RESOURCES
GEOTHERMAL SYSTEMS
LITHOLOGY
NATIONAL ORGANIZATIONS
NORTH AMERICA
PERMEABILITY
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
TEXAS
US DOE
US ORGANIZATIONS
USA
WELLS