Chamosite: critical ingredient in diagenetic differentiation of sandstone reservoirs
Conference
·
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:6377269
Chamosite is a common constituent in several productive Pennsylvanian sandstones such as the Spiro and Sells sandstones in the Arkoma basin and Springer sandstones in the Anadarko basin. Chamosite is a penecontemporaneous to early diagenetic mineral that occurs in several distinct morphologies, including coated grains comprised of concentric laminae around detrital nuclei, granules/nodules, thick pore coatings, and pseudomorphous replacement of bioclastic debris. Under plane-polarized light, chamosite varies in color from light green to light brown. X-ray diffraction analysis shows that the 14A/degrees/-basal-spacing variety is very common; however, a 7A/degrees/-chlorite (berthierine) is also present in lesser quantity. The presence of chamosite in sandstone is very significant in determining both depositional environment and postdepositional diagenetic history, including reservoir preservation. In the Pennsylvanian sandstones studied, chamosite-rich facies exhibit very distinct diagenetic patterns compared to other facies with less clay. Preservation of primary porosity is the common denominator in all chamositic sandstones, whereas quartz overgrowths and/or other types of cements tend to occlude the pore space in the cleaner facies. Thus, differentiation of these Pennsylvanian sandstones into reservoir-quality and tightly cemented types is directly related to the presence of chamosite.
- Research Organization:
- Oklahoma State Univ., Stillwater (USA)
- OSTI ID:
- 6377269
- Report Number(s):
- CONF-890404-
- Conference Information:
- Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 73:3
- Country of Publication:
- United States
- Language:
- English
Similar Records
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Conference
·
Tue May 01 00:00:00 EDT 1990
· AAPG Bulletin (American Association of Petroleum Geologists); (USA)
·
OSTI ID:6755180
Chlorite grain coats and preservation of primary porosity in deeply buried Springer Formation and lower Morrowan sandstones, southeastern Anadarko basin, Oklahoma
Conference
·
Sat Aug 01 00:00:00 EDT 1987
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
·
OSTI ID:5905542
Red Oak gas field, Arkoma basin, Oklahoma
Conference
·
Thu Feb 28 23:00:00 EST 1991
· AAPG Bulletin (American Association of Petroleum Geologists); (United States)
·
OSTI ID:5569494
Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
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& Exploration
03 NATURAL GAS
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DIAGENESIS
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
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NORTH AMERICA
OKLAHOMA
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PENNSYLVANIAN PERIOD
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USA
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
DIAGENESIS
FEDERAL REGION VI
GEOLOGIC AGES
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
MINERAL RESOURCES
NATURAL GAS DEPOSITS
NORTH AMERICA
OKLAHOMA
PALEOZOIC ERA
PENNSYLVANIAN PERIOD
PETROLEUM DEPOSITS
POROSITY
RESERVOIR ROCK
RESOURCES
ROCKS
SANDSTONES
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USA