Burial dissolution and dolomitization relationships to moldic, stylolite and fracture porosity in the Cretaceous Sunniland Formation rudistid carbonate reservoir facies, Florida
- Florida State Univ., Tallahassee, FL (United States)
Cretaceous Sunniland Formation rudistid reservoir facies buried at 3,520 meters (92 C) between evaporite units contain marginally mature algal sapropelic carbonate source rock hydrocarbons. The closed system aids in identification of porosity redistribution related to hydrocarbon emplacement. Multiple dissolution and cementation events associated with hydrocarbon migration pulses are particularly evident along stylolites. Corrosion usually predates typically interparticle first generation saddle dolomite, and corroded saddle dolomite may be observed with two generations of optically continuous limpid overgrowths separated by a corrosive boundary. Dissolution or dedolomitization may provide a magnesium source for subsequent dolomite cements. Carbonic and organic acids are probable primary corrosive agents. Moldic, stylolite and fracture porosity, often reduced by dolomite cements, was generated. Moldic pores may develop from peloids by dissolution of peripheral micritized areas. If moldic pores fail to develop in such grains, then 0.05--0.01 mm diameter peripheral channels may be occluded by dolomite cement. Channels may interconnect grains, transecting interparticle saddle dolomite. Where late moldic porosity developed, limpid scalenohedral dolomite cement may be present. The presence of limpid dolomite, which is observed to postdate corrosion, aids in the recognition of late pores. Moldic pores lacking such cement may be attributed to eogenetic origin or artifacts of thin section preparation. Burial porosity is probably far more extensive than commonly recognized; and where identified it is certainly underestimated.
- OSTI ID:
- 6887693
- Report Number(s):
- CONF-9404221--
- Journal Information:
- Geological Society of America, Abstracts with Programs; (United States), Journal Name: Geological Society of America, Abstracts with Programs; (United States) Vol. 26:4; ISSN GAAPBC; ISSN 0016-7592
- Country of Publication:
- United States
- Language:
- English
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