Hydrocarbon-induced diagenetic aureole (HIDA) - mineralogical and isotopic models
The Permian red beds that overlie some giant oil fields in southwestern and south-central Oklahoma have undergone extensive mineralogical and chemical diagenesis. The diagenetic minerals occur within a distinctly zoned aureole that delineates the position of the oil field. The geometries of the aureoles strongly reflect the major structural elements that controlled emplacement of hydrocarbons in the underlying rocks. Calcite, ferroan calcite, manganese-rich calcite, dolomite, ankerite, pyrite, marcasite, and native sulfur are the major diagenetic minerals. The innermost zone of each aureole is characterized by abundant carbonate cementation and generally coincides with a major fault system. Pyrite and marcasite cements are commonly associated with carbonate-cemented zones; these minerals occur also in the bleached sandstones. deltaC/sup 13/ values of carbonate cements indicate 3 major sources of carbon: (1) an organic source with deltaC/sup 13/ values of approximately -32 per thousand vs. PDB, (2) a freshwater source with an average deltaC/sup 13/ value of -8.0 +/- 3 per thousand, and (3) a hybrid source (freshwater and organic). A mixing model was developed to calculate the proportion of organic carbon in carbonate cement. deltaS/sup 34/ values of pyrite and marcasite average 6.1 per thousand and range from -9 to +16 per thousand. The isotopic composition of sulfides is similar to that of oil in the underlying reservoirs. Formation of diagenetic pyrite and marcasite is explained by reduction of iron oxides in red beds by hydrogen sulfide, and by other organic material associated with hydrocarbons. The HIDA concept can be used in exploration for oil and gas, specifically in structurally controlled reservoirs.
- Research Organization:
- Oklahoma State Univ., Stillwater
- OSTI ID:
- 5848652
- Report Number(s):
- CONF-850322-
- Journal Information:
- Am. Assoc. Pet. Geol., Bull.; (United States), Vol. 69:2; Conference: American Association of Petroleum Geologists annual meeting, New Orleans, LA, USA, 25 Mar 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
OKLAHOMA
PETROLEUM DEPOSITS
DIAGENESIS
EXPLORATION
CALCITE
DOLOMITE
PYRITE
SANDSTONES
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
FEDERAL REGION VI
GEOLOGIC DEPOSITS
IRON COMPOUNDS
IRON SULFIDES
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MINERAL RESOURCES
MINERALS
NORTH AMERICA
OXYGEN COMPOUNDS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
USA
020200* - Petroleum- Reserves
Geology
& Exploration