西湖凹陷K构造平湖组储层特征及影响因素

基于岩心、测井资料及岩石薄片、铸体薄片、扫描电镜和物性等分析化验资料，开展了西湖凹陷K构造平湖组砂岩储层特征研究。结果表明:平湖组砂岩主要经历了压实（压溶）、胶结、溶蚀等多种成岩作用，已达成岩后期；储层储集空间以原生粒间孔和长石溶孔为主，次生溶蚀现象常见；沉积环境是影响储层储集性能的基本因素，压实（压溶）作用是导致储层致密化的主要原因，石英次生加大和碳酸盐胶结使储层储集空间被进一步压缩；次生孔隙发育和异常高压的存在是深部储层物性得以改善的主要原因。

Reservoir Characteristics and Influencing Factors of Pinghu Formation in the K Structure of Xihu Sag

Based on the analytical data of cores, logging, common thin section, casting thin section, scanning electron microscope and physical properties, the author studied the reservoir characteristics of Pinghu Formation sandstones in the K structure of Xihu Sag. The results show that the Pinghu Formation sandstones have experienced multiple stages of diagenesis, mainly including compaction (pressolution), cementation, dissolution and reached the late stage of diagenesis. Reservoir pore space includes mainly primary residual intergranular pore and feldspar dissolved pore, and the secondary dissolution is common. Sedimentary environment is the basic factor affecting the reservoir properties. Compaction (pressolution) is the main cause of reservoir densification. The quartz overgrowth and carbonate cementation make the reservoir space further compressed. The development of secondary pores and the abnormal high pressure are the main reasons for the improvement of the physical properties of the deep reservoirs.