Chen Jianfa, Chen Zhenyan, Ji Dongmin, Yu Sheng, Zhao Changhong, Wang Xianbin. Discussion about the Ethane and Propane Intensely Richin Heavy Carbon Isotopein Natural Gases from Liaohe Basin[J]. Acta Sedimentologica Sinica, 1998, 16(2): 5-8.
| Citation:
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Chen Jianfa, Chen Zhenyan, Ji Dongmin, Yu Sheng, Zhao Changhong, Wang Xianbin. Discussion about the Ethane and Propane Intensely Richin Heavy Carbon Isotopein Natural Gases from Liaohe Basin[J]. Acta Sedimentologica Sinica, 1998, 16(2): 5-8.
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Discussion about the Ethane and Propane Intensely Richin Heavy Carbon Isotopein Natural Gases from Liaohe Basin
- 1.
Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000;
- 2.
Liaohe research Institute for Petroleum exploration and Development, Liaoning Panjing 124010
- Received Date: 1998-03-06
- Publish Date:
1998-06-10
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Abstract
Stable isotope geochemistry provides some insight into the origin, correlation and secondary reformation of natural gases. Generally, the carbon isotope composition of methane is controlled by maturity and organic matter type of source rock, and that of C2+ gaseous components of natural gases is depended on the carbon isotopic composition of organic matter in source rock and also influenced by maturity. The bacterial gas has- 55‰ of <W13 C1 and - 30‰ of <W13 C2. The thermogenic gases, with W13 C1 from - 50‰～- 25‰, W13 C2 from - 45‰～ - 22‰ and W13 C3 from - 38‰～- 21‰, are rich in heavy isotope as the maturity increasing. The abiogenic gas, with W13 C1- 25‰, has a carbon isotope reverse distribution of C1 to C4. The measurement of chemical components and carbon isotopic composition of natural gases from Liaohe basin shows that the natural gases form this basin can be divided into three groups. The group I gases, with W13 C1 f rom- 59‰～ - 50‰ ,W13 C2 from -48‰～-36‰, W13 C3 from- 40‰～-24‰ and very low concentration of C2+ (< 1.0%), are bacterial gases. The group Ⅱ gases, with W13 C1 from -49‰～-38‰, W13 C2 from -31 to-26‰, W13 C3 from -29‰ to-26‰ and concentration of C2+>5%, are typical thermogenic gases. The group III gases, with W13 C1 from-40‰～-40‰ ,W13 C2 from-13.0‰～-6.6‰, W13 C3 from - 6.1‰～+3.3% and relative low content of C2+ (< 2%), are enigmatic. The depth of reservoirs of group III gases is relative shallow, ranging from 1270 m to 1330 m. The group III gases are considered to be secondary reformed by bacterial oxidation, according to geochemical characters and geological background.
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