Comparison of porphyrin and hydrocarbon biomarker data with other indicators of maturity and oil generation
Conference
·
· AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:5866554
A single well in the San Joaquin Valley penetrates six Miocene shale formations through a depth interval of more than 10,000 ft. Eighty-three samples through the interval were analyzed by Rock-Eval to determine zones of maturity and oil generation. The maturity of select samples was also determined using porphyrins, steranes, and aromatic steroids. Rock-Eval T/sub max/ increases smoothly with depth through the interval, reaching 435/sup 0/C (the shallow limit of the oil window) at about 9500 ft. Increase in production index (S1/(S1 + S2)) and decrease in hydrogen index (S2/TOC x 100) indicate beginning of oil generation at about 10,000 ft and increasing generation with depth. The vanadyl porphyrin maturity parameter, C/sub 28/ETIO/(C/sub 28/ + C/sub 32/ DPEP) obtained by HPLC, shows a gradual increase with depth to about 10,000 ft and then a rapid increase to a maximum of 0.85 at 12,000 ft; the zone of rapid increase corresponds to the zones of maturity and of oil generation indicated by Rock-Eval parameters. The biomarker maturity parameters based on C/sub 29/ sterane isomerization and C/sub 29/ monoaromatic steroid aromatization showed a systematic increase through the interval. Isomerization and aromatization levels observed in these bitumens were comparable to local oils, thus confirming the top of the oil generation window.
- Research Organization:
- Chevron Oil Field Research Co., La Habra, CA
- OSTI ID:
- 5866554
- Report Number(s):
- CONF-870606-
- Conference Information:
- Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 71:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
CALIFORNIA
CARBOXYLIC ACIDS
CENOZOIC ERA
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC DEPOSITS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MATURATION
MINERAL RESOURCES
NORTH AMERICA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORIGIN
PETROLEUM DEPOSITS
PORPHYRINS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SHALES
SOURCE ROCKS
TERTIARY PERIOD
USA
020200* -- Petroleum-- Reserves
Geology
& Exploration
CALIFORNIA
CARBOXYLIC ACIDS
CENOZOIC ERA
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC DEPOSITS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
MATURATION
MINERAL RESOURCES
NORTH AMERICA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORIGIN
PETROLEUM DEPOSITS
PORPHYRINS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
SHALES
SOURCE ROCKS
TERTIARY PERIOD
USA