鄂尔多斯盆地镇川地区长3低渗储层特征及其控制因素  

Characteristics and control factors of Chang 3 reservoir with low permeability in Zhenchuan Area,Ordos Basin

作　　者：肖晖[1] 吴小斌[2] 何丹[1] 张忠新[1] 梁晓伟[3] 叶博[3] 

机构地区：[1]西安石油大学油气资源学院,陕西西安710065 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油长庆油田分公司勘探开发研究院,陕西西安710018

出　　处：《断块油气田》2011年第6期701-704,共4页Fault-Block Oil & Gas Field

基　　金：国家重点基础研究发展计划(973)项目"多种能源矿产共存成藏(矿)机理与富集分布规律"(2003CB214606)

摘　　要：为进一步研究鄂尔多斯盆地镇川地区长3低渗储层特征,文中利用大量岩矿分析、物性分析、铸体薄片、扫描电镜和压汞资料,分析了镇川地区长3油层组砂体的孔隙类型、孔隙结构特征,认为该区长石岩屑砂岩储层孔隙以粒间孔和粒间溶孔为主,具有胶结类型多样、平均喉道半径偏细、退汞效率偏低的特点。研究区形成低渗储层的原因为岩屑质量分数高、分选中等—差、沉积物颗粒粒度较细。后期成岩作用对储层孔隙的破坏改造作用导致储层孔隙度及渗透率进一步降低,是形成低渗储层的关键因素。In order to study the characteristics of Chang 3 reservoir with low permeability in Zhenehuan Area of Ordos Basin, the pore types and pore structure features of Chang 3 sands in the area are analyzed based on rock-mineral analysis, physical property analysis, cast thin section, scanning electron microscope and mercury penetration data in this paper. It is eonsidered that the reservoir pore of feldspar lithic sandstone is mainly intergranular pore and interparticle dissolution pore, which is characterized by various cementing types, fine average throat radius and low ejection efficiency in the area. The rocks of the area show high rock debris content, mediumpoor sorting and fine grain size of sediment, which is a material base of forming low permeability reservoir. Damage of later diagenesis to reservoir pore gives rise to the further decrease of reservoir porosity and permeability. That is a key factor of low permeability reservoir formation.

关 键 词：低渗储层 孔隙结构 控制因素 延长组 鄂尔多斯盆地 

分 类 号：TE112.2[石油与天然气工程—油气勘探]