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依据钻井、测井资料,对岩心进行测试分析发现,潜西地区古近系储层主要成分为成熟度较低的岩屑长石砂岩和长石岩屑砂岩,次生溶蚀孔隙为储层的主要储集空间,包括溶蚀粒间孔、粒内溶孔及铸模孔等。该地区储层孔隙度平均为10.1%,渗透率平均为21.64mD,属低孔、低渗储层,且非均质性强。储层发育受沉积相和成岩作用的双重影响,前者对储层的发育起宏观控制作用,在辫状河河道所发育的储层物性相对较好;后者对储层的发育起决定性作用,压实作用和胶结作用破坏了储层的储集性能,溶蚀作用和破裂作用改善了储层的储集性能。
According to the drilling and well logging data, it is found that the main components of Paleogene reservoirs in Xiuxi area are lithic feldspar and feldspar lithic sandstone with lower maturity, and the secondary dissolution pores are reservoir The main reservoir space, including dissolved intergranular pores, intragranular dissolved pores and mold holes. The average reservoir porosity in this area is 10.1%, with an average permeability of 21.64mD, which is a low-porosity and low-permeability reservoir with strong heterogeneity. The reservoir development is affected by sedimentary facies and diagenesis. The former plays a macro-control role in the development of reservoirs and the reservoir in the braided river courses is relatively good. The latter plays a decisive role in reservoir development. Compaction and cementation disrupt the reservoir’s reservoir properties, and dissolution and fracturing improve reservoir performance.