长庆油田H区A3储层特征研究

Study on the characteristics of A3 reservoir in block H of Changqing oilfield

通过对H区A3储层进行分析化验和整体研究。结果表明:三角洲平原亚相是研究区A3储层的主要沉积亚相,沉积微相则表现为分流河道,储集空间类型大部分都被残余粒间孔与粒间溶孔所占据,储层砂岩中灰色、浅灰色岩屑质石英砂岩占据绝大部分,综合判断属于中孔高渗储层;影响储层物性特征的最主要原因为沉积作用及成岩作用,因为沉积微相不仅影响优势砂体的空间展布,同时控制着岩石碎屑的发育情况,包括岩屑成分和含量。而压实作用和胶结作用可以造成孔渗的下降,其中胶结作用对储层物性的改变不仅具有破坏性,在一定程度上对储层物性是有利的。

Through the analysis and overall study of A3 reservoir in block H.The results show that the delta plain subfacies is the main sedimentary subfacies of A3 in the study area,and the sedimentary microfacies are distributary channels.Most of the reservoir space types are occupied by residual intergranular pores and intergranular dissolved pores.The gray and light gray lithic quartz sandstones in the reservoir sandstones occupy the vast majority,so it is comprehensively judged to be a medium porosity and high permeability reservoir.The main factors that affect the physical properties of reservoirs are sedimentation and diagenesis,because sedimentary microfacies not only affect the spatial distribution of dominant sand bodies,but also control the development of rock debris,including the composition and content of rock debris.The compaction and cementation can cause the decrease of porosity and permeability,and the cementation is not only destructive to the physical properties of the reservoir,but also beneficial to the physical properties of the reservoir to a certain extent.