Determination of kinetic parameters for kerogen degradation from rock-eval data
- Japan Petroleum Exploration Co. Ltd., Tokyo (Japan)
As mathematical modeling for basin analysis becomes popular, the quality of input parameters, especially for hydrocarbon generation models, is important. A mathematical model usually assumes a number of parallel chemical reactions for the process. The number of reactions nowadays is set to 12 or more for smooth generation curves. For each reaction, activation energy, frequency factor, and initial concentration of kerogen convertible to hydrocarbons are the kinetic parameters to be assigned. A special pyrolysis must be undertaken for determination of these parameters; however, the authors try to develop here a method to estimate kinetic parameters from S{sub 2} values provided by routinely processed Rock-Eval analysis. S{sub 2} value is thought to be residual potential for hydrocarbon generation of the sediment. If they assume kinetic parameters of the kerogen for a certain geologic formation, they can easily calculate the amount of hydrocarbon that had been already generated knowing the temperature history of this buried formation. Comparing the calculated amount of remaining hydrocarbon potential with the observation from pyrolysis, they are supposed to solve an inverse problem minimizing least squares residual between the two. The kinetic parameters thus can be determined by plenty of routinely analyzed Rock-Eval data. The method is applied to the data from the petroleum province in Japan, and the estimated values are found to differ from typical kerogens already proposed. Kinetic parameters are dependent on local geochemical environment as well as on the composition of kerogen types. For exploration purposes there is a general absence of good depositional models for marine sandstones that formed in the North American epicontinent at seas during the Paleozoic.
- OSTI ID:
- 6916908
- Report Number(s):
- CONF-900605-; CODEN: AABUD
- Journal Information:
- AAPG Bulletin (American Association of Petroleum Geologists); (USA), Vol. 74:5; Conference: Annual convention and exposition of the American Association of Petroleum Geologists, San Francisco, CA (USA), 3-6 Jun 1990; ISSN 0149-1423
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
58 GEOSCIENCES
PETROLEUM DEPOSITS
SOURCE ROCKS
MATURATION
GEOLOGIC FORMATIONS
GEOLOGIC MODELS
KEROGEN
MATHEMATICAL MODELS
PYROLYSIS
SANDSTONES
SEDIMENTARY BASINS
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
DECOMPOSITION
GEOLOGIC DEPOSITS
GEOLOGIC STRUCTURES
MATERIALS
MINERAL RESOURCES
ORGANIC MATTER
RESOURCES
ROCKS
SEDIMENTARY ROCKS
THERMOCHEMICAL PROCESSES
020200* - Petroleum- Reserves
Geology
& Exploration
580000 - Geosciences