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Research advances and exploration breakthrough directions of the Jurassic coal-measure whole petroleum system in the Junggar Basin, China
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DOI：10.1016/s1876-3804(26)60723-9.png)
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Abstract
En 中文
Under the guidance of the whole petroleum system (WPS) concept, the Jurassic coal-measure source rocks, source-reservoir- caprock conditions, and configurations of various hydrocarbon accumulations in the Junggar Basin were systematically investigated to reveal the hydrocarbon accumulation characteristics and exploration targets of the Jurassic coal-measure WPS. The following research insights are obtained. First, the coal rocks of the Jurassic Badaowan and Xishanyao formations, together with the mudstones of the Sangonghe Formation, constitute a unified source kitchen characterized by large thickness, high thermal evolution degree and sustained gas-generation capability. This kitchen provides an ample source for the orderly accumulation of conventional oil and gas, coal-rock gas and tight sandstone gas. Second, multi-phase fluvial–deltaic sedimentation has developed thick conventional sandstones, tight sandstones, and coal rocks as diverse types of reservoirs in the basin, offering various storage spaces for hydrocarbon accumulation, while regionally extensive thick mudstones ensure effective sealing of deep gas reservoirs. Third, within the unified petroleum accumulation, system, multi-phase detachment and superimposed structures control hydrocarbon migration pathways and accumulation units, resulting in a orderly distribution of reservoirs from structural highs to deep sags. Specifically, at the southern margin, deep conventional natural gas and deep coal-rock gas are endowed in the central segment, while oil and gas coexist in the eastern and western segments; in the basin hinterland, coal-rock gas generated from old strata and stored in young strata is confirmed in the Dinan–Baijiahai area, while coal-rock gas generated and stored in the same set of strata is discovered in the Qigu area; in the slope and structurally complex zones, tight sandstone gas of the Badaowan Formation is found.
Keywords:
coal-measure whole petroleum system
conventional oil and gas
coal-rock gas
tight sandstone gas
Jurassic
Junggar Basin
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