Characteristics and Origins of the Natural Gas and Implications for Gas-Source Correlation in Deep Formations of the Songliao Basin, NE China

Zhengjian Xu, Biao Peng, Yanjun Feng, Luofu Liu, Chao Fang, Mingli Shao, Kexin Jia, Kangjun Wu and Yingying Chen
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Zhengjian Xu: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Biao Peng: Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Xi’an 710000, China
Yanjun Feng: Energy & Geoscience Institute, University of Utah, Salt Lake City, UT 84108, USA
Luofu Liu: State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China
Chao Fang: CNPC Engineering Technology R&D Co., Ltd., Beijing 102206, China
Mingli Shao: Research Institute of Petroleum Exploration and Development, Jilin Oilfield Branch, CNPC, Songyuan 138000, China
Kexin Jia: Research Institute of Petroleum Exploration and Development, Jilin Oilfield Branch, CNPC, Songyuan 138000, China
Kangjun Wu: School of Petroleum Engineering, Chongqing University of Science and Technology, Chongqing 401331, China
Yingying Chen: Henan Provincial Information Center of Geology and Minerals, Zhengzhou 450003, China

Energies, 2019, vol. 12, issue 24, 1-27

Abstract: The Songliao Basin is the most productive petroliferous lacustrine basin in NE China, and numerous large gas fields with large proven reserves occur in its deep formations. However, considerable challenges remain: (1) the origins and genetic types of the natural gases are controversial; (2) the gas-source correlations are poorly studied; and (3) the migration distance is vague. In this study, these problems are addressed by the study of the gas compositions, light hydrocarbons, and stable hydrogen and carbon isotopes. The gases are predominantly of organic and thermogenic origins. The Huoshiling (J 3 h) and Shahezi (K 1 sh) gases are mainly mixtures of coal-derived and oil-associated gases and the mixed-sources of primary kerogen degradation and secondary oil cracking, while the Yingcheng (K 1 yc) gases are mainly coal-derived gases and predominantly derived from primary kerogen degradation. The gases in different sags are derived from the source rocks developed in the same sags where the gases accumulated, characterized by the proximal-source accumulation. Vertically, the gases in the J 3 h and K 1 sh are predominantly sourced by the proximal J 3 h and K 1 sh mudstones, while the gases in the K 1 yc are mainly derived from either the J 3 h or the K 1 sh source rocks, suggesting the gas migration with short distances.

Keywords: gas origin; gas-source correlation; stable carbon isotope; light hydrocarbon; deep formation; Songliao Basin (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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