松辽盆地长岭凹陷油气成藏规律研究

Study on oil and gas reservoir forming rule for Changling Sag in Songliao Basin

长岭凹陷位于松辽盆地中央坳陷区南部,其东西两侧分别为红岗阶地及华字井阶地,是纵贯松辽盆地南部中央坳陷区的大型凹陷。地层划分为三大构造层,即基底构造层、断陷构造层和坳陷构造层,构造演化史与松辽盆地相似,热演化的历史特征决定了盆地的构造和沉积演化特征,分为裂谷盆地的形成、断陷、断坳过渡、坳陷和挤压反转5个盆地演化阶段。长岭凹陷油气成藏受各种成藏要素及其有机配置关系所控制,通过研究认为油气成藏主要受烃源岩、有利储集相带和运移通道条件3种因素控制,主要有5种油气成藏模式：自生自储成藏模武、近源成藏模式、远源侧向成藏模式、阶梯成藏模式和垂向成藏模式。

Changling Sag is situated in the south of the center de- pression of Songliao Basin,its east and west sides are Honggang Bench and Huazijing Bench respectively,it is a huge sag which crosses south of the center depression in Songliao Basin.The strata is classified into 3 large structure zones of the basement,rift and depression structure,its structural evolution is similar to Songliao Basin,the feature of the thermal evolution history determined the characteris- tics of the basin structure and sedimentary evolution,the e- volution stages are divided into 5 sections of the forming of rifted basin,rift and depression transition,depression and compression overturn.Oil and gas reservoir forming in Changling Sag is controlled by the various essential factors of reservoir forming and the organic making up relation,it was considered by the research that the oil and gas reservoir forming was mainly controlled by 3 factors of hydrocarbon source rock,favorable storage phase belt and migration pathway conditions.There are 5 major oil and gas reservoir forming models of autogeny and auto-store,proximal,far lateral,bench and vertical way.