Comparison of maturity based on steroid and vanadyl porphyrin parameters: A new vanadyl porphyrin maturity parameter for higher maturities

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Geochimica et Cosmochimica Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(93)90079-C· OSTI ID:6422350

Sundararaman, P ^[1]; Moldowan, J M ^[2]

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1. Chevron Oil Field Research Co., La Habra, CA (United States)
2. Chevron Oil Field Research Co., Richmond, CA (United States)

Correlations are demonstrated between steriod maturity parameters and the porphyrin maturity parameter (PMP) which is based on the ratio of specific vanadyl porphyrins C[sub 28]E/(C[sub 28]E + C[sub 32]D) measured by HPLC. Measurements from a global selection of >100 rock extracts and oils show that PMP parallels changes in the C[sub 29]-sterane 20S/(20S + 20R) and tri/(tri + mono) aromatic steroid ratios, and that all three parameters appear to attain their maximum values at similar maturity levels. The triaromatic steroid side chain cracking parameter, TA I/(I + II), reaches approximately 20% of its maximum value when PMP has reached 100%. These results suggest that PMP is effective in the early to peak portion of the oil window. A new parameter, PMP-2, based on changes in the relative concentrations of two peaks in the HPLC fingerprint (vanadyl [open quotes]etio[close quotes] porphyrins), appears effective in assessing the maturity of source rocks beyond peak oil generation. In combination with PMP this parameter extends the effective range of vanadyl porphyrins parameters to higher maturities as demonstrated by a suite of oils from the Oriente Basin, Ecuador, South America. 22 refs., 6 figs., 1 tab.

• OSTI ID: 6422350
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Journal Name: Geochimica et Cosmochimica Acta; (United States) Vol. 57:6; ISSN GCACAK; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
023000* -- Petroleum-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
BIOLOGICAL MARKERS
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
CHROMATOGRAPHY
COMPLEXES
DEVELOPING COUNTRIES
ECUADOR
GEOLOGIC DEPOSITS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
LATIN AMERICA
LIQUID COLUMN CHROMATOGRAPHY
MATURATION
MINERAL RESOURCES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PETROLEUM DEPOSITS
PORPHYRINS
QUANTITATIVE CHEMICAL ANALYSIS
RESOURCES
SEPARATION PROCESSES
SOUTH AMERICA
STEROIDS
TRANSITION ELEMENT COMPLEXES
VANADIUM COMPLEXES