柴达木盆地基岩油气藏特征与有利区带研究

Bedrock Reservoir Characterization and Favorable Zones in Qaidam Basin

基岩油气藏是柴达木盆地目前油气勘探的重点领域,前期由于勘探程度低,成藏特征认识不清,影响了盆地基岩油气藏的勘探进展。为了更好地指导勘探部署,全面分析了盆地基岩油气藏在烃源岩、储层以及盖层三方面的基本特征,对柴达木盆地基岩油气成藏规律进行了系统总结。研究表明:盆地基岩具有2套优质烃源岩,储层岩性多样,储集空间包括裂缝和孔隙,存在广泛发育的优质盖层,储盖组合良好,具备断隆控聚、储盖控藏的成藏模式;在成藏研究基础上,指出盆缘山前带是基岩油气藏勘探的有利区带。该研究有效指导了柴达木盆地坪西、尖北等规模基岩气藏的发现,对今后盆地基岩油气藏勘探领域的研究也有很好的借鉴意义。

The bedrock reservoir is considered as the major hydrocarbon exploration area in Qaidam Basin. The relatively low exploration level and unclear hydrocarbon accumulation pattern limited the exploration progress of bedrock reservoir in the basin. In order to provide effective guidance for the hydrocarbon exploration deployment of bedrock reservoir,the essential properties of source-rock,reservoir and caprock are comprehensively analyzed to systematically summarize the hydrocarbon accumulation patterns of bedrock reservoir in Qaidam Basin. Research indicates that There are two sets of high-quality source-rocks with multiple lithology. The reservoir space consists of fracture and pore. The widely developed high-quality caprock and favorable reservoir-caprock combination leads to a hydrocarbon accumulation pattern of hydrocarbon gathering by fault-uplift and accumulation by reservoir-caprock.The piedmont belt of basin edge is the favorable zone for bedrock reservoir exploration according to the hydrocarbon accumulation analysis. This research effectively guides the discovery of large-scale bedrock gas reservoirs such as Pingxi and Jianbei and could also provide certain reference for the further research of bedrock reservoir exploration in Qaidam Basin.