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Volume 44 Issue 2
Mar.  2022
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2022  >  44(2): 262-269
FAN Qi, LI Qingping, WU Tao, LI Lixia, PANG Weixin, ZHU Zhenyu. Accumulation of natural gas hydrate based on migrating system: a case study of H zone of Qiongdongnan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(2): 262-269. doi: 10.11781/sysydz202202262
Citation: FAN Qi, LI Qingping, WU Tao, LI Lixia, PANG Weixin, ZHU Zhenyu. Accumulation of natural gas hydrate based on migrating system: a case study of H zone of Qiongdongnan Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2022, 44(2): 262-269. doi: 10.11781/sysydz202202262
shu

Accumulation of natural gas hydrate based on migrating system: a case study of H zone of Qiongdongnan Basin

doi: 10.11781/sysydz202202262
  • 1.

    CNOOC Research Institute Company Limited, Beijing 100028, China

  • 2.

    State Key Laboratory of Natural Gas Hydrates, Beijing 100028, China

  • 3.

    CNOOC Hainan Company, Haikou, Hainan 570100, China

  • Received Date: 2021-02-21
  • Rev Recd Date: 2022-02-28
  • Publish Date: 2022-03-28
    Abstract
  • Gas hydrate is greatly developed in the Qiongdongnan Basin which is one of the key exploration targets in the South China Sea, but the geological study of gas hydrate is insufficient. With 3D seismic data interpretation, geochemical data analysis and a large number of investigations, a related research work of H zone in the Qiongdongnan Basin was carried out in this paper, with accumulation system as the main line and focused on migration and transportation system. According to the analysis of 48 sets of geochemical data, the hydrate decomposition gas in H zone has a methane carbon isotope value (δ13C1) of -48.2‰ and a higher content of ethane and propane (C2+=21%), indicating that the gas is mainly thermogenic, and some are mixed gas. Seismic interpretation showed that the Quaternary tectonic activity in H zone was weak, and the NNE-trending gas chimney structure group, polygonal fault-silt complex and submarine slump body constituted the main migrating system and high-quality reservoir in the study area. Based on the gas source characteristics and migrating system of natural gas hydrate in H zone, three accumulation types were proposed, including the gas chimney type hydrate rich in thermogenic gas, the polygonal fracture-silt composite hydrate rich in thermogenic gas, and the submarine slump hydrate rich in thermogenic gas and mixed genetic gas.

     

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