Genetic classification of natural gases in the Bozhong Depression, Bohai Bay, China
- 44 Downloads
Abstract
The geochemical characteristics of natural gases discovered in the Bozhong Depression are systematically described in this paper. The natural gases are composed mainly of hydrocarbon gases. Natural gases occurring in the Paleogene and older reservoirs are wet gases, whereas those in the Neogene reservoirs are dry gases. Methane and ethane in the gases are significantly different in carbon isotopic composition. The methane carbon isotopic composition of the gases in structure BZ28-1 and the ethane carbon isotopic composition of the gases in structure QHD30-1 are characterized by the heaviest values, respectively. The natural gases are in the mature to highly mature stages. The hydrocarbon gases are of organic origin and can be classified as oil-type gases, coal-derived gases and mixed gases with the third one accounting for the major portion.
Key words
Bozhong Depression origin of natural gases carbon isotopic composition composition of natural gasesPreview
Unable to display preview. Download preview PDF.
References
- Dai Jinxing (2000) Selected Works of Natural Gas Geology and Geochemistry (Vol. 2) [M]. Petroleum Industry Press, Beijing (in Chinese).Google Scholar
- Gang Wenzhe, Gao Gang, Hao Shisheng et al. (1997) Carbon isotopes of ethane applied in the analyses of genetic types of natural gas [J]. Petroleum Geology & Experiment. 19, 164–167 (in Chinese with English abstract).Google Scholar
- Ge Jiandang and Zhu Weilin (2001) An analysis of offshore gas exploration potential in terms of comparison between offshore and onshore areas in the Bohai Bay Basin [J]. China Offshore Oil and Gas (Geology). 15, 93–98 (in Chinese with English abstract).Google Scholar
- Huang Zhengji and Li Xiufen (2001) Geochemical characteristics and natural gas sources of Bozhong Depression, Bohai Bay Basin [J]. Petroleum Exploration and Development. 28, 17–21 (in Chinese with English abstract).Google Scholar
- Li Xianqi and Dai Jinxing (1997) Geochemical characteristics and genetic analysis of CO2 fields (pools) in East China [J]. Petroleum Geology & Experiment. 19, 215–221 (in Chinese with English abstract).Google Scholar
- Su Aiguo, Zhao Wenzhi, Dang Yuqi et al. (2006) Generation and accumulation of Quaternary shallow gas in eastern Qaidam Basin, NW China [J]. Chinese Journal of Geochemistry. 25, 45–57.Google Scholar
- Wang Wanchun, Liu Wenhui, Xu Yongchang, Shen Ping, Kang Yan, and Ren Junhu (2005) Genetic identification of natural gases from shallow reservoirs in some oil-and gas-bearing basins of China [J]. Chinese Journal of Geochemistry. 24, 91–95.Google Scholar
- Wen Zhigang, Mi Lijun, Tang Youjun et al. (2004) Geochemical Research on Natural Gas in Bozhong Depression, Bohai Sea [M]. China University of Geosciences Press, Wuhan (in Chinese).Google Scholar
- Zhu Weilin and Ge Jiandang (2001) Gas exploration potential in offshore Bohai Bay Basin [J]. Acta Petrolei Sinica. 22, 8–13 (in Chinese with English abstract).Google Scholar