Discovery and significance of coal measure gas in Junggar Basin

doi:10.3969/j.issn.1672-7703.2021.06.003

Abstract

Abstract: Based on the analysis of reservoir in coal measure strata, geochemical characteristics of natural gas, as well as the test results of CBM wells, a new type of natural gas – coal measure gas of the Jurassic Badaowan Formation and Xishanyao Formation is proposed in this study,which is different from both coalbed methane and conventional gas, and characterized by coexistence of conventional and unconventional reservoirs, symbiosis of free gas and adsorbed gas, complementary accumulation and orderly distribution of self-generated and other-source gas. Aiming at this new exploration field, Well Caitan 1H has been deployed in Cai 31 faulted anticline structure in Baijiahai Bulge with the target layer of coal seam of the Jurassic Xishanyao Formation and great discovery of coal measure gas been achieved with the highest gas production of 5.7×104 m3/d and stable gas production of 2×104 m3/d during the well test, which enables a new breakthrough in geology understanding of natural gas, opens up a new field of natural gas exploration, guides a new direction of natural gas exploration, and has a major and far-reaching significance on gas exploration in coal bearing basins.

CLC Number:

TE112.111

Guo Xujie, Zhi Dongming, Mao Xinjun, Wang Xiaojun, Yi Shiwei, Zhu Ming, Gan Renzhong, Wu Xueqiong. Discovery and significance of coal measure gas in Junggar Basin[J]. China Petroleum Exploration, 2021, 26(6): 38-49.

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