China Petroleum Exploration ›› 2018, Vol. 23 ›› Issue (5): 37-46.DOI: 10.3969/j.issn.1672-7703.2018.05.005

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Reservoir controlling mechanism by combined faulting-magmatic activities and exploration practice in the volcanic rock zone, South Bohai Sea

Li Guoying, Yang Bo, Han Zijun, Yang Haifeng, Hu Zhiwei, Su Wen, Deng Hui, Gao Yanfei   

  1. Tianjin Branch of CNOOC Ltd.
  • Received:2017-07-21 Revised:2018-07-24 Online:2018-09-15 Published:2018-09-15
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Abstract: Exploration in the volcanic rock zone in South Bohai Sea has been facing many challenges:poor seismic data, difficult characterization of target traps, deeply buried reservoirs, less researches on the development mechanism of high-quality reservoirs, complex geological conditions, and unclear hydrocarbon accumulation mechanism. Systematical 3D quantitative description of the Cenozoic volcanic rock and structural correction imaging with variable interval velocity have restored the original structure under the volcanic rock and provided a reliable basis for fine structural interpretation. Based on fine delineation of the hydrocarbon accumulation conditions in the volcanic rock zone, it is proposed that the combined control of faulting and magmatic activities determines the formation of the slope-bulge belt and the development of large-scale traps; the orderly spatial-temporal distribution of magmatic activities is conducive to the development of deep reservoirs; and the orderly spatial-temporal configuration of "fault and magma" controls the differential hydrocarbon accumulation. Guided by these understandings, the first large-scale high-quality oilfield, BZ34-X, was discovered in the volcanic rock zone of the southern slope in the Huanghekou sag.

 

Key words: South Bohai Sea, volcanic rock zone, slope-bulge belt, reservoir controlling mechanism, exploration practice

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