Genesis of natural gas and genetic relationship between the gas and associated condensate in Bozhong 19-6 gas condensate field, Bohai Bay Basin

被引：0
|
作者：
Hu A. [1 ]
Wang D. [1 ]
Yu H. [1 ]
Jiang T. [1 ]
Sun Z. [1 ]
机构：
[1] Bohai Petroleum Research Institute, Tianjin Branch of CNOOC, Tianjin
来源：
Oil and Gas Geology | 2020年 / 41卷 / 05期
关键词：
Bohai Bay Basin; Bozhong 19-6 gas condensate field; Condensate; Gas-source correlation; Maturity; Natural gas;
D O I：
10.11743/ogg20200502
中图分类号：
学科分类号：
摘要：
The genesis of natural gas in the Bozhong 19-6 gas condensate field in the Bohai Bay Basin is analyzed by means of petroleum geochemical analyses, and the genetic relationship between condensate and natural gas is thereby determined. The results show that the natural gas in the Bozhong 19-6 gas condensate field is mainly composed of wet hydrocarbon gases with relatively low C1/(C2+C3) values ranging from 6.4 to 7.3, and carbon isotope values of methane and ethane ranging from -38.0‰ to -39.0‰ and from -25.4‰ to -27.0‰, respectively, indicating humic-prone kerogene-cracked gases probably derived from the source rocks of the third member of the Shahejie Formation. A number of condensate and gas maturity parameters show that both condensate and natural gas from the field are mature, with natural gas slightly maturer than condensate. Geological evidences also reveal that the field went through a hydrocarbon accumulation process of "early oil and late gas", with the main condensate accumulation stages (since 12 Ma) prior to those of natural gas (since 5 Ma). © 2020, OIL & GAS GEOLOGY Editorial Board. All right reserved.
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页码：903 / 912and984
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