An Approach to the Evolution of TOC Value for Source Rock and Its Relation to Efficiencies of Hydrocarbon Generation and Expulsion

ZHONG Ning-ning; LU Shuang-fang; HUANG Zhi-long; ZHANG You-sheng; XUE Hai-tao

Pyrolysis and numeric modeling techniques were adopted to reveal the loss rate of total organic carbon content (TOO with source rock maturation process. The TOC loss rate was presented as DTOC = (TOC°-TOC/TOC°. While source rock is of lower efficiencies of hydrocarbon generation and exclusion, the DTOC is a negative value, i. e. in this case the TOC value mount up with maturation progress. With increase in efficiencies of hydrocarbon generation and exclusion, DTOC goes up gradually, i. e. TOC loss rate increases and source rock therefore change its TOC evolution path from a "carbon adding" process to a "carbon reduction" process. There is only the type I kerogen source rock that under the ideal condition of extremely high efficiencies of hydrocarbon generation and exclusion the range of DTOC increase ("carbon adding" process) could be significant. It is evident that the criteria of carbonate source rock which bases on the recovery of original TOC value is likely an overestimate of "carbon reduction" process. Thus, in many cases, it would sugar up originally poor source rock.

1. The Key Lab for Mechanism of Petroleum Accumulation of the State Education Ministry, Petroleum University, Beijing 102249;

2. Department of Geoscience, Daqing Petroleum Institute, Daqing Heilongjiang 163000

Received Date: 2003-11-15

Publish Date: 2004-12-10

Key words:

source rock appraisal /
organic matter abundance /
TOC value /
efficiencies of hydrocarbongeneration and expulsion

Abstract: Pyrolysis and numeric modeling techniques were adopted to reveal the loss rate of total organic carbon content (TOO with source rock maturation process. The TOC loss rate was presented as DTOC = (TOC°-TOC/TOC°. While source rock is of lower efficiencies of hydrocarbon generation and exclusion, the DTOC is a negative value, i. e. in this case the TOC value mount up with maturation progress. With increase in efficiencies of hydrocarbon generation and exclusion, DTOC goes up gradually, i. e. TOC loss rate increases and source rock therefore change its TOC evolution path from a "carbon adding" process to a "carbon reduction" process. There is only the type I kerogen source rock that under the ideal condition of extremely high efficiencies of hydrocarbon generation and exclusion the range of DTOC increase ("carbon adding" process) could be significant. It is evident that the criteria of carbonate source rock which bases on the recovery of original TOC value is likely an overestimate of "carbon reduction" process. Thus, in many cases, it would sugar up originally poor source rock.

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Reference (21)

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An Approach to the Evolution of TOC Value for Source Rock and Its Relation to Efficiencies of Hydrocarbon Generation and Expulsion

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