Earth Science Frontiers ›› 2023, Vol. 30 ›› Issue (6): 213-231.DOI: 10.13745/j.esf.sf.2023.2.24

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Hydrocarbon generation, residual hydrocarbon and petroleum expulsion characteristics of Ordovician carbonate source rocks in northern Tarim and its surrounding areas

PANG Hong1,2(), PANG Xiongqi1,2,*(), WU Song3, CHEN Junqing2,4, HU Tao1,2, JIANG Fujie1,2, CHEN Dongxia1,2   

  1. 1. College of Geosciences, China University of Petroleum (Beijing), Beijing 102249, China
    2. State Key Laboratory of Oil and Gas Resources and Exploration, China University of Petroleum (Beijing), Beijing 102249, China
    3. Shenzhen Branch of China National Offshore Oil Corporation (CNOOC) Limited, Shenzhen 518054, China
    4. College of Science, China University of Petroleum (Beijing), Beijing 102249, China
  • Received:2023-01-08 Revised:2023-02-11 Online:2023-11-25 Published:2023-11-25

Abstract:

The Ordovician carbonate rocks in northern Tarim Basin and its surrounding areas are considered effective source rocks, however, their hydrocarbon generation, residual hydrocarbon and petroleum expulsion characteristics and the relative contribution to petroleum accumulation are not well understood. Based on the logging data and thermal simulation parameters for 21 wells in the study area, combined with geological and geochemical statistical analysis and numerical simulation, this paper aims to address the above issues and reveal the hydrocarbon expulsion behavior o f source rocks in different evolutionary stages. The results show that the hydrocarbon generation center is located in the gentle slope area of Shuntuogol-Shunnan region. The hydrocarbon expulsion occur broadly in the water-soluble, oil-soluble, diffusive and free phases in proportion of 6.5%, 0.4%, 9.8% and 83.3%, respectively. Combined with the dominant migration channels and high-quality reservoir distribution in the study area, the fault zones of the Shuntuogol low uplift/Shunnan gentle slope and southern Shaxi uplift/Shunbei gentle slope zone are identified as the next key exploration areas.

Key words: effective source rock, hydrocarbon expulsion characteristics, evolution stage, hydrocarbon expulsion phase, hydrocarbon expulsion contribution

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