潮水盆地金昌坳陷油气成藏条件分析与含油气远景评价

Oil-gas accumulation condition analysis and oil-gas prospect evaluation of Jinchang depression in Chaoshui basin.

通过重点解剖潮水盆地金昌坳陷青土井浅油藏 ,结合区域研究 ,对其油气成藏条件进行了系统分析。青土井浅油藏得以保存的主要原因是背斜控制、断层遮挡和岩性封闭 ,油藏规模小则是由于后期破坏严重、储集层物性较差、圈闭与油源条件配置不佳。金昌坳陷生储盖条件有由边缘向沉积中心由差变好的趋势 ,具备较好的圈闭条件 ,油气侧向运移距离短 ,有效烃源岩分布范围基本上控制了油气的平面分布。建议下步勘探要围绕生油中心 ,以早期构造 (如金川构造等 )作为钻探目标。潮水盆地勘探应主要立足于寻找中小型侏罗系油气藏。图 5表 1参 2(门相勇摘 )

Through dissecting Qingtujing shallow oil reservoir and combining this with regional studies, the condition of oil gas accumulation in Jinchang depression of Chaoshui is analyzed systematically, from this the authors suggest that the main reason that Qingtujing shallow oil reservoir could be preserved is due to anticline controlling, fault covering up and lithologic sealing, and that oil pools are small is because of severe destruction and bad reservoir physical property as well as lack of good collocation between trap condition and oil source condition. Regional study shows that the source reservoir sealing conditions lie the trend from bad to good from depression edge to depocenter, and trap condition is good. Finally, authors suggest that exploration in future should be done around the depocenter and early structure (e.g. Jinchuan structure) should be chosen to drill, and searching medium small size oil gas reservoirs should be taken as the key in basin exploration.