Using cathodoluminescence to map regionally zoned carbonate cements occurring in diagenetic aureoles above oil reservoirs, Velma Oil Field, Oklahoma

Conference · Fri Mar 01 00:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:5874955

Barker, C E; Daiziel, M C ^[1]

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1. Geological Survey, Denver, CO (United States)

Strongly reducing chemical conditions related to the microseepage of petroleum above oil reservoirs appear to cause mappable variations in the trace element content of resulting late-diagenetic carbonate cements. Published geochemical studies show that changes in Fe and Mn concentration in carbonate cements are a cause of chemical zonation in some diagenetic aureoles related to oil reservoirs. Thus, CL can be used as a sensitive detector of changes in Fe/Mn ratio, if other trace element CL sensitizers/quenchers have a negligible effect in the samples. Out samples seem to respond to changes in Fe/Mn suggesting that in this case CL can be used to make a quick visual estimate of Fe/Mn content in the carbonate cements. Application of the method of Velma oil field, Oklahoma, suggests that the cathodoluminescent properties form a regionally mappable zoned pattern seemingly related to the production field. The diagenetic aureole at Velma, Oklahoma, is particularly well developed. It consists of dark reddish-brown sandstone containing abundant iron sulfide and ferroan carbonate cements over the reservoir, surrounded by iron-poor country rock. The regional cathodoluminescence pattern observed in the carbonate cements roughly correlates with the observed changes in iron content with dull- or nonluminescent cement (high Fe/Mn) over the field and dull to bright luminescence (low Fe/Mn) on its flanks. The regional CL zonation is interpreted to be caused by vertical microseepage of petroleum producing reducing conditions over the reservoir.

• OSTI ID: 5874955
• Report Number(s): CONF-910403-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:3; Conference: Annual meeting of the American Association of Petroleum Geologists (AAPG), Dallas, TX (United States), 7-10 Apr 1991; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
58 GEOSCIENCES
OKLAHOMA
PETROLEUM DEPOSITS
GEOCHEMICAL SURVEYS
RESERVOIR ROCK
CATHODOLUMINESCENCE
DIAGENESIS
CARBONATE MINERALS
CEMENTS
GEOCHEMISTRY
IRON
MANGANESE
MAPPING
QUANTITY RATIO
BUILDING MATERIALS
CHEMISTRY
DEVELOPED COUNTRIES
ELEMENTS
FEDERAL REGION VI
GEOLOGIC DEPOSITS
LUMINESCENCE
MATERIALS
METALS
MINERAL RESOURCES
MINERALS
NORTH AMERICA
RESOURCES
SURVEYS
TRANSITION ELEMENTS
USA
020200* - Petroleum- Reserves
Geology
& Exploration
580000 - Geosciences