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为了研究吴堡地区长6储层的成岩作用和孔隙演化对储层物性的影响,采用普通薄片、铸体薄片、扫描电镜、X射线衍射等多种手段进行测试分析。研究结果认为:吴堡地区长6储层主要为长石砂岩,压实作用是长6储层原生孔隙减少的主要原因之一,胶结作用是原生孔隙进一步减小,尤其是碳酸盐胶结,但绿泥石膜胶结物的存在抑制了压实作用和胶结作用的进行,有利于原生孔隙保存;而溶蚀作用,尤其是长石的溶解,产生次孔隙,改变了储层物性;孔隙演化展现了储层孔隙在不同阶段的变化率和变化原因,再现了储层的演化历史,确定了储层致密化时间。长6储层总体处于晚成岩阶段,溶蚀型次生孔隙是这个时期的主要孔隙类型,其发育带往往是有利储层发育区。
In order to study the diagenesis of Chang6 reservoir in Wu-wu area and the influence of pore evolution on reservoir physical properties, several methods such as ordinary thin slice, cast thin slice, scanning electron microscope and X-ray diffraction were used for testing and analyzing. The results show that the Chang 6 reservoir is mainly feldspar sandstone in Wubao area, and the compaction is one of the main reasons for the decrease of primary porosity in Chang 6 reservoir. The cementation is a further reduction of primary porosity, especially carbonate cementation, However, the presence of chlorite film cements inhibits the compaction and cementation, which is favorable for the preservation of primary pores. The dissolution, especially the dissolution of feldspar, creates secondary pores and changes reservoir physical properties. The evolution of porosity The rate of change of pore in different stages and the reason of change of reservoir porosity are reproduced. The evolution history of reservoir is reproduced and the densification time of reservoir is determined. Chang 6 reservoirs are generally in the late diagenetic stage. Eroded secondary pores are the major pore types during this period, and their development zones are often favorable reservoir development areas.