南翼山油田浅层颗粒灰岩孔隙类型及成岩作用分析

Analysis of pore type and diagenesis of shallow grain limestone in Nanyishan Oilfield

柴达木盆地南翼山油田浅层颗粒灰岩油藏为低孔、低渗油藏,为了更好地认识其低孔、低渗的原因,根据普通薄片、铸体薄片、扫描电镜等资料对其岩石类型及孔隙类型进行了研究,并以此为基础对其成岩作用进行了深入研究,确定主要成岩作用包括压实作用、早期胶结作用、溶蚀作用、晚期胶结作用等,并分析了各种成岩作用对孔隙发育与保存的影响。根据该浅层颗粒灰岩油藏储层低孔、低渗原因,即可实施有效地实施储层改造措施,从而实现对南翼山油田浅层颗粒灰岩油藏有效开发。

The shallow grain limestone reservoir in Nanyishan Oilfield of Qaidam Basin is low porosity and low permeability.This paper studies the rock and pore types based on common rock slice,casting lamella and scan- ning electron microscope data,and further studies the diagenesis which mainly includes compaction,early ce- mentation,denudation and late cementation.The impact of various diagenesis on pore development and preserva- tion is also analyzed.Therefore,proper reservoir stimulation measures can be implemented according to the cau- ses of low porosity and low permeability to effectively develop the shallow grain limestone reservoir in Nanyishan Oilfield.