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储层特征是寻找油气富集有利区块和进行油田开发研究的一个重要基础。通过实验和数据分析的方法对研究区长4+5储层特征进行研究,寻找开发中存在的问题,指出开发潜力,为进行储量复算制定合理的油藏开发方案。通过研究发现,吴起地区W井区长4+5储层主要发育在水下分流河道砂体,以细砂岩为主。孔隙类型以剩余粒间孔和溶蚀孔为主,其中剩余粒间孔是本区砂岩储集层的主要孔隙类型。长4+5储层属小孔微细喉型孔隙结构。受沉积和成岩作用的双重影响,储层非均质性强,物性较差,属超低渗储层。
Reservoir characteristics are an important basis for the search for favorable oil and gas enrichment blocks and for oilfield development research. Through the experiment and data analysis, the paper studied the 4 + 5 reservoirs in the study area to find out the problems in development, pointed out the potential of development and worked out a reasonable reservoir development plan for reserve recalculation. It is found through research that the 4 + 5 reservoirs in Well W in Wuqi area mainly develop in submarine distributary channel sand bodies, mainly composed of fine sandstone. The pore types are dominated by the remaining intergranular pores and dissolution pores, of which the remaining intergranular pores are the major pore types of sandstone reservoirs in this area. Long 4 +5 reservoir is a microporous microporous pore structure. Due to the dual influence of sedimentation and diagenesis, the reservoirs have strong heterogeneity and poor physical properties, which are ultra-low permeability reservoirs.