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本文通过岩心观察、铸体薄片鉴定及样品分析、扫描电镜等分析资料,对川东北普光地区须家河组储层特征进行了研究,其结果表明:该套储层储集空间以次生孔隙为主,储层物性较差,为超低孔超低渗储层;储层主要受沉积微相、成岩作用和裂缝的综合影响,其中三角洲相中的分流河道是最有利储层发育的微相,但是成岩作用早期的压实作用和硅质胶结、碳酸盐胶结使孔渗变差的主要原因,但绿泥石衬边胶结物对于部分孔喉的保存起到了一定的作用,裂缝的发育改善了储层的储集空间和渗流能力。因此川东北地区陆相地层须家河组具有良好的勘探开发潜力。
In this paper, the reservoir characteristics of Xujiahe Formation in Puguang area, northeastern Sichuan were studied by core observation, identification of cast thin sections, sample analysis and scanning electron microscopy (SEM). The results show that the reservoirs in this reservoir are characterized by secondary porosity Mainly reservoir properties are poor ultra-low porosity and ultra-low permeability reservoirs. Reservoirs are mainly affected by sedimentary microfacies, diagenesis and fractures. The distributary channel in the delta facies is the most favorable reservoir development However, the early compaction of diagenesis and siliceous cementation and carbonate cementation are the main reasons for the poor permeability. However, the chlorite lining cement plays a part in the preservation of some pore throats. Development improves the reservoir’s reservoir space and seepage capacity. Therefore, the Xujiahe formation in the continental strata in northeastern Sichuan has a good exploration and development potential.