应用扫描电镜技术对影响砂岩储层孔隙因素的研究

Analysis of the influence factors of the pore of sandstone reservoir by scanning electron microscopy

应用扫描电镜技术,镜下观察分析及大量资料整理,对影响大港油田砂岩储层孔隙因素进一步探讨。得出的结论是,受机械压实作用,压溶作用和石英的次生加大,溶解作用和溶解后的胶结,砂岩中的胶结物种种因素的影响。其不同的作用过程对砂岩孔隙度的影响也各不相同。机械压实作用,早期的胶结作用都是早期的成岩作用;压溶作用和石英的次生加大,都影响岩石物性变差,主要是由温度引起的;溶解后的孔隙再胶结,是决定砂岩储层最终孔隙度高低的关键;粘土矿物是砂岩填隙物的主要组成部分。

with the application of electron microscope scanning technique,through observation and analysis and a large amount of data processing,this paper further discussed the factors that influence the pore of sandstone reservoir in Dagang oilfield.The conclusion is that： with the effects of mechanical compaction,pressure solution and overgrowth of quartz,dissolution and re-cementation after dissolution,cement in the sandstone and other factors,effects of different processes on the porosity of sandstone are also not identical.Mechanical compaction and early cementation are early diagenesis,both pressure solution and overgrowth of quartz make the physical property of the rock become poor,mainly caused by the temperature; The re-cementation of dissolved pore is the crucial factor which determine the final porosity of sandstone reservoirs,and lay mineral is the main part of the sandstone fillings.