合水地区长8超低渗透储层成因分析

合水地区长8超低渗透油藏是长庆油田一个重要勘探开发潜力区,不断有新的油气富集区发现,因此,需要对储层进行不断地追踪研究。在前人研究基础上,根据新的钻井岩心、砂岩薄片、铸体薄片、扫描电镜和X-衍射等资料,从沉积、成岩等方面对长8储层成因主控因素进行了分析,认为合水地区长8超低渗透储层的形成,主要受沉积微相、碎屑成分、碎屑粒度、压实作用、胶结作用和溶蚀作用等因素控制;压实及胶结作用是储层致密化的最主要控制因素,溶蚀作用是局部储层物性改善的关键因素。

Genetic analysis of Chang 8 ultra-low permeable reservoir of Heshui area

Chang 8 ultra-low permeable reservoir of Heshui area is an important potential exploration and development area in Changqing oilfield, with constant newly discovered hydrocarbon enrichment zones, and therefore, follow-up study should be carried out necessarily. Based on the existing research, in accordance with new drilling core, sandstone thin section, cast body thin section, scanning electron microscopy (sem) and X-diffraction data, the analysis has been carried out from the sedimentary and lithologic aspects. The results indicate the Chang 8 ultra-low permeable reservoir development is mainly affected by sedimentary microfacies, clastic composition, detrital grain size, compaction, cementation, dissolution and denudation action factors control, and among which, the compaction and cementation of reservoir densification are the main controlling factors, dissolution effect is a key factor to improve local reservoir physical property.