Characteristics of hydrocarbon generation and expulsion in matrix and stylolite of carbonate rocks  

作　　者：高岗 郝石生 王晖 

出　　处：《Science China Earth Sciences》1999年第2期202-206,共5页中国科学（地球科学英文版）

基　　金：Project supported by the Science and Technology Research of the 9th Five-Year Plan from China National Petroleum & Gas Company.

摘　　要：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.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 matrixes is the lowest and that of stylolites is between marl’s or carbonate varve’s and matrix’ s.

关 键 词：CARBONATE ROCK MATRIX stylolite VARVE efficiency of HYDROCARBON expulsion. 

分 类 号：P588.245[天文地球—岩石学]