关中地区中深层热储岩石学特征及潜在损害因素分析  

Petrological characteristics and potential damage factors of mid-deep geothermal reservoirs in Guanzhong Area

作　　者：罗向荣[1,2] 赵智强 郭鸿 王璐 张乐 刘建强 任晓娟[1,2] 平婉卓 LUO Xiangrong;ZHAO Zhiqiang;GUO Hong;WANG Lu;ZHANG Le;LIU Jianqiang;REN Xiaojuan;PING Wanzhuo(Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil&Gas Reservoirs in West China,Ministry of Education,Xi’an Shiyou University,Xi’an 710065,China;School of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China;Shaanxi Hygrogeology Engineering Geology and Environment Geology Survey Center,Xi’an 710068,China;Shaanxi Engineering Technology Research Center for Urban Geology and Underground Space,Xi’an 710068,China)

机构地区：[1]西安石油大学西部低渗-特低渗油藏开发与治理教育部工程研究中心,陕西西安710065 [2]西安石油大学石油工程学院,陕西西安710065 [3]陕西省水工环地质调查中心,陕西西安710068 [4]陕西省城市地质与地下空间工程技术研究中心,陕西西安710068

出　　处：《西北大学学报（自然科学版）》2023年第1期128-142,共15页Journal of Northwest University（Natural Science Edition）

基　　金：陕西省自然科学基础研究计划项目(2021JQ-599);陕西省地质勘查基金项目(61201908332)。

摘　　要：为搞清关中地区中深层热储的潜在损害因素,以区内蓝田灞河组热储岩样为研究对象,采用铸体薄片、粒度分析、扫描电镜、CT扫描及X衍射等手段,在岩性分类的基础上,开展填隙物、物性及孔隙结构的研究,着重分析敏感性矿物、储渗空间与热储损害的关系。结果表明,各类热储岩石的黏土矿物质量分数从高到低依次为:粉砂岩>细砂岩>中砂岩>砂砾岩。热储层岩石物性分布范围较宽,渗透率与孔隙度存在一定的正相关关系。热储岩石的物性按岩性从好到差依次为:砂砾岩>中砂岩>细砂岩。杂基质量分数越高,热储岩石的物性越差。各类热储岩石中较大尺寸的孔喉对渗透率的贡献大,热储岩石中的地层微粒尤其是黏土矿物,在与外界流体接触或所处环境改变时,很容易发生分散、运移,对储层造成损害;热储岩石胶结疏松的特征加剧了热储岩石自身的微粒运移。To get clear about potential damage factors of mid-deep geothermal reservoirs in Guanzhong area, the rock sample from geothermal reservoirs of Lantian-Bahe formation is taken as the research object. By means of casting thin sections, granularity analysis, scanning electron microscopy, CT scan and X-ray diffraction method, the studies on interstitial material, physical properties and pore structure are carried out based on the lithology classification, the relationships between sensitivity minerals, permeable-storage space and geothermal reservoirs damage are analyzed. The results showed that the order of clay mineral content of all kinds of geothermal reservoir rocks from the highest to the lowest was below: siltstone, fine sandstone, medium sandstone, glutenite. There was a positive correlation between permeability and porosity. According to lithology, the physical properties of geothermal reservoir rocks were in the order of glutenite, medium sandstone, fine sandstone. The higher the matrix content, the worse the physical properties of the geothermal reservoir rocks. The large-size pore throat in various types of geothermal reservoir rocks contributes greatly to permeability. When the formation particles in the rocks, especially clay minerals, contact with external fluids or their environment is changed, it is easy to disperse and migrate, causing damage to the reservoir. The characteristics of loose cementation of geothermal reservoir rocks aggravate its particle migration.

关 键 词：关中地区 热储岩石 损害 黏土矿物 物性 微粒运移 

分 类 号：P314[天文地球—固体地球物理学]