Hydrocarbon accumulation conditions and exploration potential of the Jurassic coal measure gas in Junggar Basin

doi:10.3969/j.issn.1672-7703.2024.04.003

Abstract

Abstract: Two sets of coal seams are widely distributed in the Jurassic Xishanyao and Badaowan formations in Junggar Basin, and there are abundant coal measure gas resources. However, as a completely new field of natural gas, the level of basic research is low, and gas accumulation characteristics, enrichment laws and resource scale in the basin are unclear. In 2020, a risk exploration well CT1H was drilled to explore gas bearing property of deep coal rocks, and a maximum daily gas rate of 5.7×10⁴ m³/d was tested, as well as a steady gas rate of 2×10⁴ m³/d in trial production, confirming the high and steady production capacity of coal measure gas. A systematic study on coal rock petrological characteristics, reservoir performance, evolution characteristics and control factors for gas accumulation in coal measure strata has been conducted, which indicates that the thermal evolution degree of coal rocks is low, with a medium-low coal rank, and the coal reservoir in Xishanyao Formation is dominated by meso-macro pores, while that in Badaowan Formation is mainly micro-small pores; By combining with multiple factors controlling gas accumulation in coal measure strata, such as source rock, structure, coal reservoir, and abnormal gas logging shows, the potential fields of coal measure gas in the basin have been classified and evaluated. Two favorable exploration areas including Dinan-Baijiahai and Qigu areas have optimally been selected, and coal measure gas resources are more than 1×10¹² m³ with a burial depth of 2000-4000 m.

CLC Number:

TE122.2

Mao Xinjun, Li Yanping, Liang Zeliang, Zhu Ming, Yao Weijiang, Li Shubo, Pan Tuo, Hu Zhengzhou, Wang Yang. Hydrocarbon accumulation conditions and exploration potential of the Jurassic coal measure gas in Junggar Basin[J]. China Petroleum Exploration, 2024, 29(4): 32-44.

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