History of burial diagenesis determined from isotopic geochemistry, Frio Formation, Brazoria County, Texas
- Univ. of Texas, Austin
Progressive burial diagenesis of the Oligocene Frio Formation in Brazoria County, Texas, has resulted in extensive reaction between pore fluids and sediment in a major shift toward water/rock equilibrium. Carbon and oxygen isotopic data, combined with fluid isotopic data from the literature, indicate that quartz cement formed at 75 to 80/sup 0/C and kaolinite at approximately 100/sup 0/C. The zone of most rapid albitization is near 150/sup 0/C. Authigenic carbonates formed over a wide range of temperatures, and those within the peak zone of hydrocarbon generation are depleted in /sup 13/C. At depths shallower than approximately 2600 m, quartz and carbonate cementation in primary intergranular pore spaces (passive diagenesis) dominated. Below 2600 m, within the geopressured zone, reaction of detrital components (active diagenesis) is the major process. Organic maturation, albitization, and the transition of smectite to illite are the processes that contribute most of the components required for precipitation of cements. Quartz cementation occurred quite early in the burial history of the Frio (beginning at approximately 1500 m of burial), when the rates of fluid expulsion were at a maximum and when little of the Frio sandstone section had reached the zone of albitization.
- DOE Contract Number:
- AC08-79ET27111
- OSTI ID:
- 5626939
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Vol. 65-8; ISSN AAPGB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580100* -- Geology & Hydrology-- (-1989)
580400 -- Geochemistry-- (-1989)
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CARBON 13
CARBON ISOTOPES
CHALCOGENIDES
CHEMISTRY
DEPTH
DEPTH 1-3 KM
DIAGENESIS
DIMENSIONS
EVEN-ODD NUCLEI
GEOCHEMISTRY
GEOLOGIC HISTORY
ISOTOPE RATIO
ISOTOPES
KAOLINITE
LIGHT NUCLEI
MINERALS
NORTH AMERICA
NUCLEI
OXIDES
OXYGEN COMPOUNDS
QUARTZ
ROCKS
SANDSTONES
SEDIMENTARY ROCKS
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
SOUTHWEST REGION
STABLE ISOTOPES
TEXAS
USA