辽河清水洼陷东营组高分辨率层序格架下沉积演化特征及有利区带预测

根据地层基准面原理，通过对岩心、测井、地震资料的综合分析，将辽河清水洼陷东营组划分为4个3级地层旋回（层序）:东三下、东三上、东二和东一层序；识别出3种类型的沉积体系:较深水湖—水下扇、浅湖—三角洲以及河流—泛滥平原体系；并在层序格架内分析了各旋回的沉积体系构成和储层砂体的发育情况。综合分析生、储、盖条件后认为，在纵向上，东三下和东三上旋回为研究区最有利的储集层段；在平面上，研究区的油气勘探应主要寻找洼陷中部的水下扇砂体和洼陷北部、西部与构造及断层相配合的辫状三角洲或扇三角洲前缘砂体，主要储层砂体类型为前缘水下分支河道砂体、河口坝和席状砂。

Sedimentary Evolution in the Framework of High Resolution Sequences of Dongying Formation and Prediction of Favorable Zones in Qingshui Sag, Liaohe

On the principle of base-level cycling and through the integrated analysis of cores, well logs and 3D seismic data, we divided the Dongying Formation (Ed) in Qingshui Depression into 4 third-order sequences, namely Lower Ed3, Upper Ed3, Ed2 and Ed1, and recognized three types of sedimentary systems, i.e. the semi-deep lacustrine subaqueous fan system, the shallow lacustrine-delta system and the alluvial-floodplain system. On the basis of the sequence identification and the sedimentary system recognition, we then studied the configuration of sedimentary systems and the development of reservoir sand-bodies in the sequential context. Finally, after evaluating the oil-generation, preservation and seal conditions, we concluded that, Lower Ed3 and Upper Ed3 sequences are the most favorable sections vertically, and exploration targets are subwater fans and delta front sands, mainly channel sands, mouth bars and sheet sands.