准噶尔盆地侏罗系深层煤岩气地质特征与成藏模式

doi:10.3969/j.issn.1672-7703.2025.04.006

摘要/Abstract

摘要： 准噶尔盆地侏罗系煤系地层发育，可作为良好的生储层系。在盆地白家海凸起钻探的CT1H井在侏罗系西山窑组煤岩储层获高产气流，打破了2000m以深的传统煤层气勘探开发深度禁区，预示了深层煤岩气有望成为能够规模增储上产的新型天然气资源类型。基于准噶尔盆地侏罗系煤岩气勘探成果，结合铸体薄片、扫描电镜、核磁共振等实验方法对深层煤岩气地质特征、成藏模式展开系统研究，进一步明确煤岩气勘探方向。准噶尔盆地发育西山窑组②号和八道湾组⑤号两套主力煤岩，腹部地区西山窑组为低阶原生结构煤，煤岩储层孔隙度平均为17.25%，生气能力差，南缘西山窑组为中阶煤，储层孔隙连通性好，游离态煤岩气占比高；八道湾组为中阶原生结构煤，煤岩孔隙度平均为3.12%，吸附态煤岩气占比达89.75%。盆地内侏罗系深层煤岩气主要发育深层它源构造型、深层自源地层型和自源构造型三类成藏模式。结合地质条件及控藏要素进行综合分析认为，准噶尔盆地侏罗系深层煤岩气有利面积合计2385km²，预测煤岩气资源量4260×10⁸m³；盆腹区滴南- 白家海地区西山窑组、八道湾组和南缘地区西山窑组是准噶尔盆地煤岩气重要的有利勘探方向。

关键词: 准噶尔盆地, 侏罗系, 煤岩气, 地质特征, 成藏模式, 资源潜力, 勘探方向

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

中图分类号:

TE122.2

何文军, 潘进, 刘超威, 王秋玉, 李辉, 陈梦娜, 李鹏, 王宁. 准噶尔盆地侏罗系深层煤岩气地质特征与成藏模式[J]. 中国石油勘探, 2025, 30(4): 77-89.

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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