海拉尔盆地贝尔凹陷兴安岭群储层粘土矿物组成及特征研究  

Composition and Characteristics of Clay Minerals from the Hingganling Group in the Beier Depression of the Hailar Basin

作　　者：付正[1] 刘钦甫[1] 田威猛[1] 侯丽华[1] 

机构地区：[1]中国矿业大学资源与安全工程学院,北京100083

出　　处：《地球学报》2008年第2期174-178,共5页Acta Geoscientica Sinica

摘　　要：海拉尔盆地地质条件及其复杂,储层粘土矿物含量高,极大影响了油气资源的高效开发。通过对X-射线衍射,偏光显微镜观察和扫描电镜分析,确定贝尔凹陷贝16断块兴安岭群粘土类型及含量,阐明了其组合及纵向分布特征,并对水敏性极强的钠蒙脱石及其间层矿物进行了详细研究。研究表明,兴安岭群储层自上而下存在3种粘土矿物组合:S+K+(C)→K+I/S+I+(C)→I+C+S/C+I/S。由地层浅部到深部,粘土矿物含量呈现由高到低的变化规律。凝灰质的水解蚀变及长石和中、酸性岩屑在成岩过程中的次生变化是造成海拉尔地区粘土含量高的主要原因。Geological conditions of Hailaer Basin are very complex. It is difficult to develop its oil reservoirs because of high content of clay minerals. Using X-ray diffraction analysis and SEM observation, the authors studied the form, content, combination and vertical distribution of clay minerals from Hingganling Group, and also probed into the genesis of these clay minerals. The result shows that compositionally there are three types of clay minerals from top to bottom in Hingganling Group： S ＋ K ＋ （C）→K ＋ I/S ＋ I ＋ （C）→I ＋ C ＋ S/C ＋ I/S. With the increasing depth, the content of clay minerals decreases gradually. It is thought that hydrolysis of tuffaceous material and secondary alteration of feldspars and rock debris are two main factors responsible for the high content of clay minerals.

关 键 词：兴安岭群 粘土矿物 钠蒙脱石 地层伤害 

分 类 号：P575.5[天文地球—矿物学]