鄂尔多斯盆地临兴区块太原组致密砂岩黏土矿物特征及其对储层物性的影响  

Clay minerals characteristics of tight sandstone and its impact on reservoir physical properties in Taiyuan Formation of Block Linxing in Ordos Basin

作　　者：刘玲[1] 汤达祯[2] 王烽[3] LIU Ling;TANG Dazhen;WANG Feng(Petroleum Exploration and Production Research Institute,SINOPEC,Beijing City,100083,China;School of Energy Resources,China Universtiy of Geosciences(Beijing),Beijing City,100083,China;Exploration and Production Department,SINOPEC,Beijing City,100728,China)

机构地区：[1]中国石化石油勘探开发研究院,北京100083 [2]中国地质大学(北京)能源学院,北京100083 [3]中国石化油田勘探开发事业部,北京100728

出　　处：《油气地质与采收率》2019年第6期28-35,共8页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金重点项目“深部煤层气系统及其能量动态平衡机理研究”（41530314）

摘　　要：鄂尔多斯盆地临兴区块太原组致密砂岩自生黏土矿物含量较高,是影响储层物性的重要因素之一,但对黏土矿物特征及成因尚未系统研究,影响了优质储层刻画。通过岩心观察、薄片鉴定、X射线衍射、物性分析,明确黏土矿物的含量及形态特征,剖析其成因及与储层物性之间的相关性。结果表明,临兴区块太原组致密砂岩黏土矿物相对含量由高到低依次为伊利石、高岭石、绿泥石及伊/蒙混层,均呈充填式分布于粒间溶蚀孔隙或晶间微孔隙中,为热水蚀变成因。紫金山岩体影响黏土矿物的含量及分布,岩体附近伊利石、绿泥石及伊/蒙混层含量较高,而高岭石含量较低。伊利石、绿泥石及伊/蒙混层与储层物性呈负相关关系,高岭石与储层物性呈正相关。受黏土矿物影响,太原组物性相对较好的致密砂岩储层分布于研究区的东北及西南部,为下一步油气勘探开发的有利目标区。The clay mineral content is high in tight sandstone of Taiyuan Formation in Block Linxing of Ordos Basin,and it is one of the important factors influencing reservoir properties. However,its characteristics and formation mechanism have not been systematically studied,affecting the description of high-quality reservoirs. According to core observation,thin section identification,X-ray diffraction and physical property analysis,the content and morphological characteristics of the clay minerals is clarified. Moreover,its formation mechanism and the relationships between the clay minerals and the reservoir physical properties are discussed. The results indicate that the relative contents of clay minerals in tight sandstone of Taiyuan Formation in Block Linxing from high to low are:illite,kaolinite,chlorite,and illite-montmorillonite mixed-layer.Most of them fill in the intergranular dissolution pores or intercrystalline micropores. Hot water erosion is the reason for the clay mineral formation. Zijinshan pluton affects the relative content and plane distribution of clay minerals. The relative contents of illite,kaolinite,chlorite,and illite-montmorillonite mixed-layer are high near Zijinshan pluton,while the relative content of kaolinite is low. There exists a negative correlation between reservoir physical properties and the three types of clay minerals,including illite,chlorite,and illite-montmorillonite mixed-layer,while there is a positive correlation between kaolinite and reservoir physical properties. Influenced by clay minerals,the high-quality reservoirs distribute in the northeast and southwest of the study area,and they are the favorable targets for the later exploration and development.

关 键 词：致密砂岩 黏土矿物 热水蚀变 紫金山岩体 临兴区块 鄂尔多斯盆地 

分 类 号：TE122.2[石油与天然气工程—油气勘探]