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Natural gas formation conditions and resource potential in mid-deep strata of the Qikou Sag，Bohai Bay Basin

Xiao Dun-qing，Jiang Wen-ya，Pu Xiu-gang，Wang Na，Yue Yun-fu，Sun Chao-nan，Dai Kun，Hua Shuang-jun   

  1. PetroChina Dagang Oilfield Company，Tianjin 300280，China
  • Received:2018-07-27 Revised:2018-08-27 Online:2018-10-10

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Abstract: In recent years，as exploration targets have expanded to the mid-deep strata，large-scale oil resources have been discovered in the Qikou Sag of the Bohai Bay Basin，and more than 70 billion cubic meters of natural gas resources were discovered as well.The difference between the thermal evolution of deep source rocks and the physical properties of reservoirs determine the coexistence of conventional gas reservoirs and unconventional gas reservoirs in deep strata，and it is bounded by a depth of 4 700m.The main body below this depth is tight sandstone gas.Using the method of generative and analogy，the Paleogene conventional natural gas resources of the Qikou Sag are more than 350 billion cubic meters，mainly distributed in the Banqiao sub-sag，and the tight sandstone gas resources are 176 billion cubic meters，mainly distributed in the mid-deep strata of Qibei sub-sag.Through the comprehensive evaluation of natural gas accumulation conditions，it further reveals that the three factors of deep high-quality source rock，high evolution and large-scale sand body are conducive to the enrichment of natural gas，which is the main occurrence state of deep hydrocarbon resources.The deep strata of Banqiao and Qibei Slopes are favorable target areas for deep gas exploration，especially in the central area of gas source，in the second member of Shagejie Formation with a certain tectonic setting and sand body development，which is the most realistic area for deep gas exploration.

Key words: The natural gas of deep strata, Lithologic reservoir, Hydrocarbon accumulation, Paleogene, Qikou Sag

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  • Cite this article

    Xiao Dun-qing, Jiang Wen-ya, Pu Xiu-gang, Wang Na, Yue Yun-fu, Sun Chao-nan, Dai Kun, Hua Shuang-jun. Natural gas formation conditions and resource potential in mid-deep strata of the Qikou Sag，Bohai Bay Basin[J].Natural Gas Geoscience, 2018, 29(10): 1409-1421.

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