Characteristics of hydrocarbon generation and expulsion in matrix and stylolite of carbonate rocks |
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Authors: | Gang Gao Shisheng Hao Hui Wang |
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Institution: | (1) Petroleum University, 102200 Beijing, China |
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Abstract: | Characteristics of organic matter content, hydrocarbon generation and expulsion of carbonate rocks are discussed by analysis
of organic carbon and pyrolysis. There is a strong inhomogeneity in distribution of organic matter in carbonate rocks. The
organic matter abundance is higher in stylolites, carbonate varves or marls, while it is the lowest in matrixes (purer carbonate
rocks around stylolites). Because of stable thickness and broad area, marls and carbonate varves may become good source rocks.
At the same depth, stylolites, carbonate varves and matrixes generate and expel hydrocarbons almost at the same time. Expulsion
efficiency of carbonate varve is the highest; that of rnatrixes is the lowest and that of stylolites is between marl’s or
carbonate varve’s and matrix’s.
Project supported by the Science and Technology Research of the 9th Five-Year Plan from China National Petroleum & Gas Company. |
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Keywords: | carbonate rock matrix stylolite varve efficiency of hydrocarbon expulsion |
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