松辽盆地东部榆树断陷下白垩统岩相展布特征及有利勘探区带预测  

Lithofacies distribution and prediction of favorable exploration play of Lower Cretacous in Yushu Fault Depression,eastern Songliao Basin

作　　者：任燕宁 崔桐[2] 刘杨[3] 朱莹[1] 张航[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林大学东北亚国际地学研究与教学中心,长春130026 [3]中国石油吉林油田分公司勘探开发研究院,吉林松原138000

出　　处：《世界地质》2017年第1期174-181,共8页World Geology

基　　金：中国地质调查局(DD20160165-2);吉林油田项目(JS12-W-13-JZ-7-40)联合资助

摘　　要：根据榆树断陷钻井、测井及地震资料,建立了榆树断陷地层-构造格架,恢复了主要地层单元岩相展布特征,剖析了生储盖发育特征,预测了有利勘探区带。研究结果表明:榆树断陷的榆东、榆西两个次级断陷均为雁行式组合断裂控制的半地堑式复合体,二者以中部榆树凸起为中线,构成了镜像次级断陷组合;其内发育了湖泊-扇三角洲-近岸水下扇沉积体系,并在火石岭组时期形成了较大规模的火山溢流相和爆发相,构成了自生自储、下生上储及上生下储型有利生储盖组合;预测榆东次级断陷内位于中部凸起区邻接两侧次洼区烃源岩的火山穹窿带,是油气有利勘探区带。Integrating drilling,well-logging and seismic data,in this study,we established the stratigraphicstructural framework,restored the lithofacies distribution of main stratigraphic units,analyzed the source-reservoirtrap assemblage and predicted favorable exploration play in Yushu Fault Depression. The results showed that the Yushu Fault Depression consists of Yudong and Yuxi sub-depressions,of which both are half-grabens controlled by the echelon fault combination. The two sub-depressions are separated by the Yushu uplift in the middle and mirrored each other. The depressions are mainly composed of lacustrine-fan delta-nearshore subaqueous fan systems,with large scale volcanic explosive and effusive facies occurred in Huoshiling Formation. This forms self-sourcing and self-reservoiring,lower-sourcing and upper-reservoiring,upper-sourcing and lower-reservoiring assemblages.The volcanic domes belt of central uplift adjacent to the source rocks in the Yudong sub-depression is the favorable exploration play in the study area.

关 键 词：地层-构造格架 岩相展布特征 有利勘探区带 榆树断陷 松辽盆地 

分 类 号：P534.53[天文地球—古生物学与地层学]