Predicting diagenetic history and reservoir quality in the Frio Formation of Brazoria County, Texas and Pleasant Bayou test wells
Good-quality geothermal reservoirs displaying secondary porosity exist on the upper Texas coast (Brazoria County), site of the Pleasant Bayou No. 1 and No. 2 wells, and are attributed to a moderately stable mineral assemblage, normal geothermal gradients, and low in situ pH. Major authigenic minerals are calcite, quartz, and kaolinite. Detrital feldspar has been extensively albitized at depth. Major diagenetic events overlapped, occurring in the general order-precipitation of calcite, formation of quartz overgrowths, albitization, leaching of calcite to form secondary porosity, and precipitation of kaolinite. Seventeen Brazoria County water analyses including two from the Pleasant Bayou No. 2 well were thermodynamically tested. Predictions based on equilibrium thermodynamics add new insight on mineral stabilities and are consistent with the paragenetic sequence developed from petrographic data. Early precipitation of calcite at shallow depths of burial is predicted. Low temperture and low in situ pH explain the general absence of chlorite. The use of solution-mineral equilibria as a predictor of reservoir quality is inconclusive, but well-defined clustering of waters indicates that identification of regional trends will probably be possible. Shallow waters may be the key to predicting reservoir quality at depth.
- Research Organization:
- Texas Univ., Austin (USA). Bureau of Economic Geology; Radian Corp., Austin, TX (USA)
- DOE Contract Number:
- AC08-79ET27111
- OSTI ID:
- 6309176
- Report Number(s):
- CONF-811026-7; ON: DE81029771
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
152000* -- Geothermal Data & Theory
ALKALINE EARTH METAL COMPOUNDS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
DIAGENESIS
ENERGY SYSTEMS
GEOPRESSURED SYSTEMS
GULF COAST
Geothermal Legacy
MINERALOGY
NORTH AMERICA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRECIPITATION
RESERVOIR ROCK
ROCK-FLUID INTERACTIONS
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SOUTHWEST REGION
TEXAS
THERMAL WATERS
THERMODYNAMIC PROPERTIES
USA