针对低(超低)渗储层的开发现状和长庆油田合水地区延安组的储层特征,在岩心观察的基础上,运用铸体薄片、扫描电镜、高压压汞等多种实验手段,全面、系统的对该区延安油层组沉积规律、储层物性、微观孔隙结构等进行了详细研究。研究结果表明,合水地区延10、延9储层物源来自南部;延8储层物源南部、北部均有;就沉积相而言,延10以辫状河亚相为主,延9、延8以三角洲平原亚相为主;岩石类型以岩屑质长石砂岩为主;孔隙类型以残余粒间孔为主,喉道类型以片状、缩颈型喉道为主;储层连通储集空间较小,渗流能力较差,储集能力一般。总而言之,合水地区延安组储层应具有可观的含油量,有一定的开发潜力,但也有一定的开采难度。 Aiming at the development status of low (ultra-low) seepage reservoirs and reservoir characteristics of Yan’an Formation in Heshui Oilfield of Changqing Oilfield, based on the observation of cores, a variety of experimental methods, such as casting thin slice, scanning electron microscopy and high pressure mercury intrusion, Comprehensively and systematically studied the deposition law, reservoir physical property and microscopic pore structure of Yan’an Formation in this area. The results show that the source rocks of the Yan 10 and Yan 9 reservoirs in the Heishui area are from the south, and the source rocks of the Yan 8 reservoir are both from the north and the north of the Yan 8 reservoir. In terms of sedimentary facies, , And Yan 8 is dominated by deltaic subfacies in the delta plain. The rock types are mainly lithic feldspathic sandstones. The pore types are dominated by residual intergranular pores, and the throat type is dominated by lamellar and necking throats. The reservoir Connected to the reservoir space is smaller, seepage capacity is poor, storage capacity in general. All in all, the Yan’an Formation reservoir in Heshui should have considerable oil content and some potential for exploitation, but there are also some difficulties in mining.