鄂尔多斯盆地西南部延长组储层砂岩主要成岩作用  

Reservoir Sandstone Diagenesis of Yanchang Formation,Southwest of Ordos Basin

作　　者：王庆东[1] 孙治雷[2] 孙致学[3] 

机构地区：[1]成都理工大学沉积地质研究院 [2]中国科学院广州地球化学研究所,广州510640 [3]成都理工大学能源学院,成都610051

出　　处：《内蒙古石油化工》2008年第3期66-68,共3页Inner Mongolia Petrochemical Industry

摘　　要：鄂尔多斯盆地西南部延长组储层主要由岩屑长石砂岩、长石岩屑砂岩和长石砂岩组成,富岩屑长石、相对贫石英、结构成熟度成份成熟度低是其骨架颗粒的主要特征。自生矿物主要有方解石、绿泥石、石英、高岭石等。储层经历了压实作用、胶结作用和溶解作用等成岩作用的改造,目前处于中成岩B期。受早期绿泥石膜保护而保存下来的原生孔隙和溶解作用形成的次生孔隙是研究区主要储集空间,绿泥石包膜的形成和溶解作用的发育在研究区孔隙保护和演化中起到了重要作用。The reservoir sandstone of Yanchang formation in southwest Ordos basin is mainly composed of lithic arkose ,feldspathic lithic sandstone and arkose. Riching felspar, lacking quartz and low of composition and structure is the character of sandstone in the aera. The main diagenetic minerals of the sandstone include calcite, chlorite, Quarta and kaolinite. The reservoir has experenced diagenesis, compaction,cenmentaion, dissolution,and is now in the middle diagnetic phase B. The primary pore which protected by the authigenic chlorite clay rims and the dissolution secondary pore are the mainly spaces in the sandstone. It play very important role that the completment of authigenic chlorite clay rim and the evolvement of secondary pore.

关 键 词：鄂尔多斯盆地 成岩作用 粘土矿物 次生孔隙 成岩序列 

分 类 号：P618.130.2[天文地球—矿床学] TE21[天文地球—地质学]