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Transition element ratios in organic matter from Monterey Formation: transition element-lithofacies correlations

Conference · · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:5866787
; ;
A suite of four transition elements (Cr, Mo, Ni, and V) was analyzed in the organic matter (kerogen and extract) of cores from the Union Leroy 51-18 well, Santa Maria Valley field, California. Elemental concentrations in kerogens were found to vary systematically with depth when normalized to elemental carbon contents. This may suggest that these elements are bound to the organic matter of kerogen concentrates and may be useful in characterizing sedimentary organic matter from the Monterey Formation. Concentration ratios of these elements (e.g., V/(V + Ni); Mo/(Mo +Cr)) were used to divide the sedimentary organic matter into two populations. These populations correspond almost exactly to the siliceous and phosphatic lithofacies. These populations are valid for both soluble organic matter and kerogen concentrates. The observed pattern in these elements may be related to the Eh-pH conditions of the depositional environment. If these trace element zones are shown to be laterally recognizable, the transition element stratigraphy of sedimentary organic matter will be useful for subsurface correlations in the Monterey Formation in the Santa Maria basin.
Research Organization:
Unocal Corp., Brea, CA
OSTI ID:
5866787
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
BITUMINOUS MATERIALS
CALIFORNIA
CARBONACEOUS MATERIALS
CHEMISTRY
CHROMIUM
DRILL CORES
ELEMENTS
FEDERAL REGION IX
GEOCHEMISTRY
GEOLOGIC DEPOSITS
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
KEROGEN
MATERIALS
METALS
MINERAL RESOURCES
MOLYBDENUM
NICKEL
NORTH AMERICA
ORGANIC MATTER
PETROLEUM DEPOSITS
RESOURCES
SEDIMENTARY BASINS
TRANSITION ELEMENTS
USA
VANADIUM