准噶尔盆地侏罗系煤岩气成藏条件及勘探潜力

doi:10.3969/j.issn.1672-7703.2024.04.003

摘要/Abstract

摘要： 准噶尔盆地侏罗系西山窑组、八道湾组两套煤层广覆式分布，煤系地层气资源十分丰富。但作为一个全新的天然气领域，盆地煤岩气基础研究薄弱、成藏特征、富集规律及资源规模不清。为探索深部煤岩的含气性，2020年钻探风险探井CT1H井，测试获最高日产气5.7×10⁴m³，试采日产气量稳定在2×10⁴m³，证实煤岩气领域具备高产稳产能力。通过对深部煤岩岩石学特征、煤岩储集性能、演化特征、煤岩气成藏控制因素等系统研究，明确了盆地煤岩演化程度低，属于中—低阶煤，西山窑组煤岩以中—大孔为主，八道湾组煤岩以微—小孔为主；构建了盆地煤岩气古生中储与自生自储两类成藏模式；结合烃源岩、构造、煤岩储层特征及气测异常响应等多种控藏因素对盆地煤岩气潜在领域进行了分类评价，优选了滴南—白家海、齐古两大煤岩气勘探有利区，计算二者2000～4000m埋深煤岩气资源量超万亿立方米。

关键词: 准噶尔盆地；侏罗系；煤岩气, 成藏模式；勘探潜力

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.

中图分类号:

TE122.2

毛新军, 李艳平, 梁则亮, 朱明, 姚卫江, 李树博, 潘拓, 胡正舟, 汪洋. 准噶尔盆地侏罗系煤岩气成藏条件及勘探潜力[J]. 中国石油勘探, 2024, 29(4): 32-44.

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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