中基性火山岩对查干凹陷油气成藏条件的影响

查干凹陷为一白垩纪断陷湖盆，发育白垩纪含油气系统。经多年勘探与研究，一致认为查干凹陷具有良好的勘探前景，但至今尚未找到工业油流，认真分析了前人研究成果及勘探成果，认为中基性岩浆的活动对查干凹陷油气成藏起着重要的控制作用。在早白垩世早期板内拉张凹陷发育阶段。深部物质上涌，造成大陆溢流型中基性岩浆喷发，导致生烃凹陷与构造高部位隔断，油气的生成，运移，富集都受到火山岩的影响。

Mid-basic Igneous Rock Influence on Reservoir Forming in Chagan Depression

Chagan Depression is a rift subsidence lake basin, which has developed cretaceous hydrocarbon. After many years of exploration and studying, we think this depression has favorable prospect for exploration. But no commercial oil flow has been discovered.With careful analysis on previous studying and exploration, I have drawn such a conclusion: it's mid basic igneous rock that controls reservoir forming. During early cretaceous period, deep material flowed upwards by internal plate tension, which caused continental effusive eruption of mid basic igneous rock; Hydrocarbon bearing depression was also separated from the top of the structure. So generation, migration and accumulation of oil and gas were also under the influence of igneous rock.