通过研究区内大量铸体薄片及物性资料分析, 对鄂尔多斯盆地吴旗地区长6 油层组储层的岩石学特征、孔渗特征、孔隙结构及孔隙类型等进行深入研究, 分析影响储层储集性能的主要因素。结果表明, 三角洲前缘亚相沉积的长6 储层具矿物成熟度低而结构成熟度高的岩石学特点, 储层以粒间孔和溶蚀孔最为发育, 中孔和小孔是主要的油气储集空间, 细喉和中喉则是长6 的基本渗流通道, 为典型中低孔、特低渗储集层。储层物性受沉积微相和成岩作用双重控制, 平面上储层物性受沉积相带的控制, 垂向上压实和胶结作用使储层物性明显变差, 而溶蚀作用产生的次生孔隙使储层物性得到改善。

Based on the analysis of cast slice and petrophysics, the petrology characteristics, porosity and permeability, pore structure and pore types of Chang 6 reservoir in Wuqi area are studied, and its influencing factors are analyzed. The result shows that Chang 6 reservoir is characterized by low mineral maturity and high structure maturity, medium porosity and low permeability with intergranular pore and solution pore developed well. Medium pore and small pore are the main reservoir space. Fine throat and middle throat are the basic seepage passage. The reservoir property is closely related to both sedimentary microfacies and diagenesis. It is affected by sedimentary facies belt on plane, and made poor by compaction and cementation in vertical direction, however, improved by secondary pores caused by dissolution.