摘要
通过孔渗测定、电镜扫描、铸体薄片、阴极发光、高压与恒速压汞等测试手段,对鄂尔多斯盆地SMG探区长8段致密储层的孔渗关系、岩石学特征、孔喉结构及尺寸分布进行全面系统地剖析,结果表明:该区长8储层平均孔隙度为6.52%,平均渗透0.113×10-3μm^2,孔渗关系复杂,井间非均质性较强;储层碎屑组分以长石为主,属长石砂岩;发育粒间孔和长石等溶孔,绿泥石与泥质填隙物含量较高,使得孔渗条件进一步变差,属微孔-微喉型结构;依据压汞参数及毛管力曲线特征将长8储层分为3类:Ⅰ类为低门槛压力-高进汞饱和度型,Ⅱ类为低门槛压力-低进汞饱和度型,Ⅲ类为高门槛压力-低进汞饱和度型,Ⅰ类储层最好,属于"优质"储层,Ⅱ类次之,Ⅲ类最差。
The relationship between porosity and permeability,the petrological characteristics,the pore-throat structure and size distribution characteristics of the Chang 8 tight sandstone reservoir in SMG area of Ordos Basin are studied by means of porosity and permeability measurement,SEM,casting thin-section,cathodluminescence and high-pressure and constant-rate mercury injection. The results show that,the average porosity is 6. 52%,and the average permeability 0. 113 × 10^-3μm^2,the relationship between porosity and permeability is complex,and there is strong interwell heterogeneity. Feldspar is the main clastic component,so the Chang 8 reservoir is defined as feldspar sandstone. Intergranular pore and dissolution pore are developed,and the content of chlorite and shale fillings is high,which makes the physical property of the Chang 8 reservoir become poorer,so the Chang 8 reservoir is micropore-microthroat type. The Chang 8 reservoir is classified into three types according to mercury injection parameters and the features of capillary pressure curves：Type I has low threshold pressure and high maximum saturation of mercury; Type II has low threshold pressure and low maximum saturation of mercury; Type III has high threshold pressure and low maximum saturation of mercury.
出处
《西安石油大学学报（自然科学版）》
CAS
北大核心
2017年第2期40-45,75,共7页
Journal of Xi’an Shiyou University（Natural Science Edition）
基金
国家自然科学基金"低渗油藏低频振动辅助表面活性剂复合驱油机理研究"(编号:51274229)
国家自然科学基金"延时式可控高能气体压裂技术动力学机理研究"(编号:51104173)
关键词
储层特征
长8致密储层
SMG探区
鄂尔多斯盆地
reservoir characteristic
Chang 8 tight sandstone reservoir
SMG area
Ordos Basin
