临南洼陷沙三段隐蔽油藏形成与分布的差异性

The Difference of Es3 Subtle Reservoir Distribution in Linnan Sag

研究了临南洼陷沙三段(Es3)沉积体系的展布特征,分析了Es3隐蔽油藏砂体分布的差异性。研究结果表明,临南洼陷Es3具有多旋回、多物源的沉积特点,发育了多种隐蔽砂体类型。纵向上,浊积岩主要分布在C2、C3层序中,三角洲砂体主要分布在C1、C4层序中;横向上,受控于沉积模式的不同,各物源体系的优势砂体类型有所差异;双丰三角洲以平原亚相河道砂体和前缘亚相席状砂体为主,江家店瓦屋和盘河三角洲以前缘亚相河口坝和水下分流河道砂体为主,基山三角洲介于2者之间;受不同级别断层切割遮挡的控制,形成了浊积岩与席状砂岩性油藏、断层切前缘砂体构造-岩性油藏和断层切河道砂体岩性-构造油藏3种隐蔽油藏类型。

Through systematic anatomy of the Es3sedimentary system in Linnan Sag,it analyzes the differences of the subtle reservoir sand.Vertically,the turbidites are mainly distributed in the C2,C3sequence,the delta sand is mainly distributed in C1,C4sequences.Laterally,it is controlled by different sedimentary models,the advanced types of sands in each provenance system are not the same.Shuangfeng Delta is mainly of the plain subfacies channel sand and delta front subfacies sheet sand.Jiangjiadian-Wawu Delta and Panhe Delta are mainly of the front subfacies distributary mouth bar and underwater distributary channel sand.The Jishan Delta is somewhere in between.According to the type of sand and fault superimposed relationship,it is point out that there are three types of subtle reservoirs of different levels of fault cutting and occlusion,such as the turbidite and sheet sand lithologic reservoir,fault cutting front sand structural lithologic reservoir and fault cutting channel sand lithologic structural reservoir.Turbidite reservoir is mainly distributed in the three deep water zones,Sheet sand reservoir is distribued in gentle slope belt,Fault cutting front sand structural lithologic reservoir is mainly distributed along the tertiary fault zone,Fault cutting channel sand lithologic structural reservoirs are controlled by the low-level sequence fault,mainly distributed between the gentle slope belt.