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Natural Gas Exploration and Development >

2023 , Vol. 46 >Issue 2: 20 - 29

DOI: https://doi.org/10.12055/gaskk.issn.1673-3177.2023.02.003

RESOURCES EXPLORATION

Fine characterization for inner structure of shallow-sea gravity flow gas reservoirs in submarine fan

  • LI Jia ,
  • ZHOU Wei ,
  • YE Qing ,
  • WANG Yu ,
  • PENG Xiaodong ,
  • PENG Xuan
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  • Hainan Branch, CNOOC China Limited, Haikou, Hainan 570312, China

Accepted date: 2023-03-21

  Online published: 2023-06-16

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Abstract

Natural gas exploration in the South China Sea makes successive discoveries in shallow-sea gravity flow sedimentary reservoirs. However, the unique sedimentary type, complex sedimentary mechanism, and the HT/HP condition of the reservoirs led to superimposed gas-bearing sand bodies, and extremely complicated gas-water distribution. There is a lack of effective techniques and methods for accurately characterizing the inner structure of reservoir. Based on the study results of detailed sedimentary microfacies, multiple inversion techniques were developed, represented by combined forward and inverse methods, and waveform inversion. By integrating interpretation of seismic sedimentology, the superimposed pattern of sand body unit was established for the study area to achieve high-precision characterization for complex sedimentary reservoirs. The following results are obtained: (i) The distribution of sand bodies is controlled by changes in sedimentary facies. There develops four superimposed patterns of genetic unit sand body, including lateral erosion channel - distributary channel superimposing, lateral distributary channel - distributary channel superimposing, lateral distributary channel - channelized lobe contact, and lateral lobe-lobe superimposing. (ii) Three main distribution models of gas reservoir in the area are clarified, including the large-scale tectonic-lithologic monolithic edge-water gas reservoir with a unified gas-water contact, small-scale lithologic-trap gas reservoir with independent gas-water system formed by differential charging, and locally retained-water gas reservoir formed by physical shielding. (iii) The study achievements are applicable to finely characterizing the inner structure of complex sand-body reservoirs, and can effectively guide the exploration and development for China’s first offshore HT/HP basin.

Key words： Submarine fan; Seismic sedimentology; Sand-body description; Inner structure characteristics; Gas-water distribution; Gas reservoir model

Cite this article

LI Jia , ZHOU Wei , YE Qing , WANG Yu , PENG Xiaodong , PENG Xuan . Fine characterization for inner structure of shallow-sea gravity flow gas reservoirs in submarine fan[J]. Natural Gas Exploration and Development, 2023 , 46(2) : 20 -29 . DOI: 10.12055/gaskk.issn.1673-3177.2023.02.003

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