鄂尔多斯盆地苏里格气田西南部成岩矿物转化与储层物性
发布时间：2018-07-20 18:03
【摘要】：成岩矿物的转化是致密砂岩储层物性变化的主要因素之一。为了探索二者之间的关系以及储层致密化成因,采用薄片观测、扫描电镜分析、阴极发光分析等手段,结合成岩演化过程中的矿物热力学特征和体积变化,探讨了苏里格气田西南部山1段、盒8段砂岩的矿物组成、孔隙特征、矿物转化机制及其对储层孔隙的影响。结果表明:1胶结物以黏土矿物、方解石为主,硅质少量;2绿泥石薄膜可包裹高岭石和石英加大边,偶见放射状绿泥石且孔隙较好;3黏土矿物晶间孔占孔隙比重较高,高岭石伊利石化后的晶间孔隙较发育,其次为溶蚀孔隙;4嵌晶状方解石充填剩余粒间孔隙,并交代石英加大边和伊利石,破坏储层物性。认为中成岩A期的钾长石溶蚀、蒙脱石伊利石化、高岭石伊利石化、黑云母水化都会使得矿物体积变小,属于增孔反应,在一定程度上改善储层孔隙;且胶结作用增加储层的抗压实能力,在一定程度上保护了原生孔隙;故在分析胶结作用对物性的影响时,不能简单地归结为破坏性成岩作用。
[Abstract]:The transformation of diagenetic minerals is one of the main factors to change the physical properties of tight sandstone reservoirs. In order to explore the relationship between them and the formation of reservoir densification, thin slice observation, scanning electron microscope analysis and catholuminescence analysis were used to combine the thermodynamic characteristics and volume changes of minerals during diagenetic evolution. In this paper, the mineral composition, pore characteristics, mineral transformation mechanism and its effect on reservoir porosity of sandstones in the first and eighth member of Shan formation in southwestern Sulige gas field are discussed. The results show that the clay mineral and calcite are the main cementing materials, and a small amount of siliceous chlorite film can wrap the edge of kaolinite and quartz, and occasionally see radioactive chlorite and the pore size is better and the intergranular pore proportion of clay mineral is higher. The intergranular pores after kaolinite Illite are relatively developed, and the next is the dissolution pore, the intergranular calcite, filling the remaining intergranular pores, and replacing the quartz to enlarge the edge and the Illite, thus destroying the reservoir physical properties. It is considered that the dissolution of potassium feldspar, montmorillonite Illite, kaolinite Illite and biotite hydration in the A stage of the middle diagenetic rocks can make the mineral volume smaller, which is an increasing pore reaction and improves the reservoir porosity to a certain extent. The cementation increases the compaction resistance of the reservoir and protects the primary pores to a certain extent, so the analysis of the effect of cementation on physical properties cannot simply be attributed to destructive diagenesis.
【作者单位】： 山东科技大学地球科学与工程学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;中国石油长庆油田苏里格气田研究中心;中国石油集团测井有限公司长庆事业部;
【基金】：国家自然科学基金(编号:41402120) 山东科技大学科研创新团队计划(编号:2010KYTD103)联合资助
【分类号】：P618.13
本文编号：2134322
[Abstract]:The transformation of diagenetic minerals is one of the main factors to change the physical properties of tight sandstone reservoirs. In order to explore the relationship between them and the formation of reservoir densification, thin slice observation, scanning electron microscope analysis and catholuminescence analysis were used to combine the thermodynamic characteristics and volume changes of minerals during diagenetic evolution. In this paper, the mineral composition, pore characteristics, mineral transformation mechanism and its effect on reservoir porosity of sandstones in the first and eighth member of Shan formation in southwestern Sulige gas field are discussed. The results show that the clay mineral and calcite are the main cementing materials, and a small amount of siliceous chlorite film can wrap the edge of kaolinite and quartz, and occasionally see radioactive chlorite and the pore size is better and the intergranular pore proportion of clay mineral is higher. The intergranular pores after kaolinite Illite are relatively developed, and the next is the dissolution pore, the intergranular calcite, filling the remaining intergranular pores, and replacing the quartz to enlarge the edge and the Illite, thus destroying the reservoir physical properties. It is considered that the dissolution of potassium feldspar, montmorillonite Illite, kaolinite Illite and biotite hydration in the A stage of the middle diagenetic rocks can make the mineral volume smaller, which is an increasing pore reaction and improves the reservoir porosity to a certain extent. The cementation increases the compaction resistance of the reservoir and protects the primary pores to a certain extent, so the analysis of the effect of cementation on physical properties cannot simply be attributed to destructive diagenesis.
【作者单位】： 山东科技大学地球科学与工程学院;海洋国家实验室海洋矿产资源评价与探测技术功能实验室;中国石油长庆油田苏里格气田研究中心;中国石油集团测井有限公司长庆事业部;
【基金】：国家自然科学基金(编号:41402120) 山东科技大学科研创新团队计划(编号:2010KYTD103)联合资助
【分类号】：P618.13
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