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|Authors:||Shi Jianglong; Li Jian; Li Zhisheng; Hao Aisheng|
|Author Affiliations:||Primary: |
University of Chinese Academy of Sciences, Institute of Porous Flow Fluid Mechanics, China
Research Institute of Petroleum Exploration and Development-Langfang, Petro China
|Volume Title:||Shiyou yu Tianranqi Dizhi Oil & Gas Geology|
|Source:||Shiyou yu Tianranqi Dizhi = Oil & Gas Geology, 38(2), p.302-310. Publisher: Zhongquo Dizhi Xuehui, Shiyou Dizhi Zhuanye Weiyuanhui, Dizhi Pucha Kantan Zhu, Beijing, China. ISSN: 0253-9985|
|Note:||In Chinese with English summary|
|Summary:||The Cambrian carbonate reservoirs of Tazhong uplift is rich in oil and gas. However, there are different opinions on the origin and genetic types of oil and gas in this area due to the complex tectonic setting. In this paper, we studied the origin and genetic types of oil and gas through a detailed analysis of the composition and carbon isotope data of condensate oil and gas in different intervals of the Cambrian in ZS1, ZS1 C and ZS5 wells and the geochemical characteristics of the Cambrian-Lower Ordovician and Middle-Upper Ordovician source rocks. The results indicate that the Cambrian gas in the Tazhong uplift is typical cracking gas of sapropelic kerogen. Gas in the Xiaoerbulake Formation is typical over-mature dry gas with a drying coefficient of higher than 0. 98 and N2 content of 2.5% ∼4.0%. The carbon isotopes of group composition and individual n-alkanes of condensate in the Xiaoerbulake Formation are relatively heavy. The carbon isotope of C9-C20 n-alkane are -28.8per mill ∼-26.3per mill. These geochemistry characteristics indicate that the condensate oil and gas in the Xiaoerbulake Formation originated from the Cambrian-Lower Ordovician source rocks. While the natural gas in the Awatage and Wusonggeer Formations is low-mature wet gas with a drying coefficient of 0.63∼0.78 and N2 content of 0.2%∼0.8%. The carbon isotope of group composition and individual n-alkanes of condensate in the Awatage and Wusonggeer Formations are relatively light. The carbon isotopes of C9-C23 n-alkane are -37.25per mill∼-32.56per mill. Thesegeochemistry characteristics indicate that the condensate oil and gas in the Awatage and Wusonggeer Formations originated from the Middle-Upper Ordovician source rocks.|
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