苏里格气田东区致密砂岩储层特征

发布时间：2018-03-31 22:18

本文选题：致密砂岩储层　切入点：地质成因　出处：《油气地质与采收率》2017年06期

【摘要】：鄂尔多斯盆地苏里格气田具有低孔低渗透特征,发育最为典型的致密砂岩储层。基于苏里格气田东区二叠系下石盒子组、山西组及太原组取心资料,结合电镜扫描、铸体薄片等技术手段对致密砂岩储层地质成因、岩石学特征、储集空间类型及储层物性特征进行实验和统计分析。研究结果表明:苏里格气田东区致密砂岩储层主要地质成因为埋深大导致强压实作用所致;孔隙演化过程主要受压实作用和矿物胶结作用影响;储层粘土矿物中高岭石含量较高,且易脱落并堵塞孔喉,片状伊利石和绿泥石充填孔隙形成分割喉道,其他矿物镶嵌胶结及蒙脱石强水敏性等因素使储层渗透性降低;另外,由于原生孔隙不发育,岩石颗粒分选差,粘土矿物充填粒间孔隙,也降低其渗透性;致密砂岩储层储集空间类型主要为岩屑溶孔、晶间孔及长石溶孔。
[Abstract]:Sulige gas field in Ordos Basin has the characteristics of low porosity and low permeability, and develops the most typical tight sandstone reservoir. Based on the core data of Lower Shihezi formation, Shanxi formation and Taiyuan formation of Permian in the eastern part of Sulige gas field, combined with scanning electron microscopy, The geological origin and petrological characteristics of tight sandstone reservoir by casting thin sheet and other technical means, The experimental and statistical analysis of reservoir space types and reservoir physical properties shows that the main geological formation of tight sandstone reservoirs in the eastern part of Sulige gas field is due to the strong compaction caused by the large buried depth. The process of pore evolution is mainly affected by compaction and mineral cementation. Other factors such as inlaid cementation of minerals and strong water sensitivity of montmorillonite reduce the permeability of reservoir, in addition, the permeability of reservoir is also reduced because the primary pores are not developed, the rock particles are poorly sorted, and the clay minerals are filled with intergranular pores. The reservoir space types of tight sandstone reservoir are mainly lithic dissolved pore, intergranular pore and feldspar dissolved pore.
【作者单位】：东北石油大学石油工程学院;中国石油长庆油田分公司第五采气厂;
【基金】：国家科技重大专项“大型油气田及煤层气开发”(2016ZX05010002-004)
【分类号】：P618.13

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