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Gas formation mechanism of marine carbonate source rocks in china

Science china Earth Sciences 2005年第4期48卷 441-453页

作者： zhao wenzhi1, wang zhaoyun1, {2. haiqing2. ZHANG mingjie3, wang hongjun1, wang yunpeng4 & qin yong5 1. research institute of petroleum exploration & development, petrochina, beijing 100083, china 2. petrochina exploration & Production, beijing 100011, china 3. Department of Geology, Lanzhou University, Lanzhou 730000, china 4. Guangzhou Geoc{2.mical institute, Chinese Academy of Sciences, Guangzhou 510640, china 5. china University of Mining and Technology, Xuzhou 2.1000, china research {1. of {2. exploration & development PetroChinaBeijin China petrochina {1. & Production Beijing China Department of Geology Lanzhou University Lanzhou China Guangzhou Geochemical {1. Chinese Academy of Sciences Guangzhou China china University of Mining and Technology Xuzhou China

By breaking through the conventional ideology on the study of gas-formation mechanism of source rocks which focused on merely the characteristics of source rocks them- selves, and based on the development and distribution characteristics of marine carbonate source rocks in the medium-to-bottom parts of the Chinese superimposed sedimentary basins as well as various processes in the course of gas generation and reservoir forming, the complex hydrocarbon-generating model of carbonates is established. Such a model concerns not only the “three-stage” gas formation characteristics of carbonates, but also the gas generation process due to a thermal cracking of oil and the re-generation process of gas from heated secondary organic matters during the gas-generation and reservoir-forming course. The high-quality hy- drocarbon generating matter of marine carbonate source rocks determined a high gas-oil ratio and tended to form paleo-oil-reservoirs, representing an enrichment process of organic matters. The thermal cracking of oil in palaeo-oil-reservoirs is an important means for the effective forma- tion of gas reservoirs. The secondary organic matters in carbonate reservoirs may regenerate gas after a secondary deep burial, thus becoming an effective gas source.

关键词： carbonate, three-stage hydrocarbon generation, inhibitive effect of maturity, oil-cracking gas, second-ary asphalt gas.

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