Geological characteristics and accumulation mode of Jurassic deep coal rock gas in the Junggar Basin

doi:10.3969/j.issn.1672-7703.2025.04.006

Abstract

Abstract: The Jurassic coal measures in the Junggar basin are well developed and can be used as a good source reservoir series.The CT1H well drilled in the Baijiahai uplift of the basin achieved high-yield gas flow in the coal rock reservoir of the Jurassic Xishanyao formation,breaking the traditional depth exclusion zone for coalbed methane exploration and development of over 2000 meters. It indicates that the deep coal rock gas is expected to become a new type of natural gas resource that can increase reserves and production on a large scale. Based on the exploration results of Jurassic coal rock gas in the Junggar basin, combined with cast thin section, scanning electron microscope, nuclear magnetic resonance and other experimental methods, this paper conducts a systematic study on the geological characteristics and resource potential of deep coal rock gas, and further defines the direction of coal rock gas exploration. According to the research, two sets of main coal rocks, namely, Xishanyao formation②and Badaowan formation⑤, are developed in the the Junggar basin. Xishanyao formation in the hinterland is low rank primary structural coal with an average porosity of 17.25% and poor gas generating capacity. The Xishanyao formation in the southern margin is composed of medium rank coal, with good reservoir pore connectivity and a high proportion of free coal rock gas.The Badaowan formation is a coal with a medium primary structure, with an average reservoir porosity of 3.12% and an adsorbed coal rock gas ratio of 89.75%. The Jurassic deep coal and rock gas in the basin mainly develop three types of reservoir formation models: deep non source structure type, deep self source extensive coverage type, and deep self source structure type. Combined with geological conditions and reservoir control factors, it is considered that the favorable area of various types of deep coal rock gas in the Junggar basin is 2385km² in total, and the predicted coal rock gas resource is 4260×10⁸m³. Xishanyao formation, Badaowan formation in Dinan-Baijiahai area and Xishanyao formation in the southern margin of the basin are favorable exploration directions for coal rock gas in the the Junggar Basin in the future.

Key words: the Junggar basin, Jurassic, Coal rock gas, Geological characteristics, accumulation mode, Resource potential, exploration direction

CLC Number:

TE122.2

He Wenjun, Pan Jin, Liu Chaowei, Wang Qiuyu, Li Hui, Chen Mengna, Li Peng, Wang Ning. Geological characteristics and accumulation mode of Jurassic deep coal rock gas in the Junggar Basin[J]. China Petroleum Exploration, 2025, 30(4): 77-89.

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