【摘要】 辽河西部凹陷陈家洼陷具备形成良好隐蔽圈闭的石油地质条件。在综合分析地震、钻井、测井和岩芯等各种资料的基础上,对陈家洼陷沙三下亚段进行了高精度层序地层和沉积相研究,并结合区域构造和成藏地质条件分析,进行隐蔽圈闭预测。结果表明,陈家洼陷沙三下亚段可划分为3个四级层序,并在四级层序内部以最大水进面为界,识别出水进体系域和高位体系域;陈家洼陷沙三下亚段发育4种主要的沉积相类型:扇三角洲、近岸水下扇、湖泊及深水重力流沉积;受断裂体系和古地貌的控制,该区北部发育扇三角洲—浅湖—深湖(半深湖)沉积体系,南部主要发育近岸水下扇—深湖(半深湖)沉积体系;根据沉积相的平面展布及演化特征,结合隐蔽圈闭成藏地质条件分析,提出了1个发育扇三角洲前缘砂体上倾尖灭型隐蔽圈闭的有利勘探靶区。更多还原

【Abstract】 There is a good oil geological condition in the Sha 3 lower subinterval in Chenjia Depression,western Liaohe Sag.Based on seismic,drilling,logging and core data,combined with the distribution of depositional systems and oil geological condition analysis,the sequence stratigraphy and sedimentology characteristics of the Sha 3 lower subinterval are researched to predict favorable subtle traps.The conclusions are as the following,the Sha 3 lower subinterval can be divided into three four-order sequence,and fourth-order sequences are further divided into transgressive and highstand system tracts,there are four kinds of sedimentary systems identified in th target layers,including fan delta,nearshore subaqueous fan,lacustrine and deep lacustrine turbidity sedimentary systems,controlled by fault systems and palaeogeomorphy,there are two depositional systems,i.e.,fan delta-shallow lacustrine-deep(hemideep) lacustrine in northern area and nearshore subaqueous fan- deep(hemideep) lacustrine in Southern area,finally,according to the plane distribution,evolvolution features of sedimentary systems and the subtle pool-forming condition,a potential exploration prospect is proposed,which is formed by fan delta front updip pinchot.更多还原