古老深层致密砂岩储集层孔隙形成与保存机制:以鄂尔多斯盆地长城系为例*
刘恒宇1,2, 刘明洁1,2, 郝志磊3, 任茵4, 吴恩郁1,2, 许晗1,2, 钟寿康1,2, 谭秀成1,2, 曾伟1,2, 连承波1,2, 戴鸿鸣1,2

Pore formation and preservation mechanisms of ancient deep tight sandstone reservoirs: a case study of the Mesoproterozoic Changcheng System in Ordos Basin
LIU Hengyu1,2, LIU Mingjie1,2, HAO Zhilei3, REN Yin4, WU Enyu1,2, XU Han1,2, ZHONG Shoukang1,2, TAN Xiucheng1,2, ZENG Wei1,2, LIAN Chengbo1,2, DAI Hongming1,2
鄂尔多斯盆地中东部长城系砂岩储集层成岩作用特征 A—颗粒呈线接触,米105井,3694.85 m,单偏光; B—颗粒呈线—凹凸接触,靖探1井,4170.55 m,单偏光; C—石英次生加大充填粒间,桃112井,3857.1 m,单偏光; D—2期自生石英晶体充填粒间,靖探1井,4179.36 m,扫描电镜; E—黏土矿物包膜、早期石英次生加大和晚期自生石英晶体充填粒间,靖探1井,4173.86 m,单偏光; F—伊利石薄膜,靖探1井,4179.58 m,扫描电镜; G—伊利石交代溶蚀石英颗粒和粒间充填伊利石,靖探1井,4170.21 m,扫描电镜; H—伊利石充填岩屑粒内溶孔,靖探1井,4176.75 m,单偏光; I—硬石膏充填砾石间,桃112井,3855.04 m,正交偏光; J—石盐充填粒间,靖探1井,4172.05 m,扫描电镜; K—粒间充填自生伊利石溶蚀交代石英次生加大边,靖探1井,4176.75 m,单偏光; L—石英颗粒被溶且溶孔内见少量石英晶体和黏土矿物充填,靖探1井,4170.21 m,单偏光。Q为石英颗粒; Qo为石英次生加大边; Qc为自生石英晶体; A为硬石膏; H为石盐晶体; I为伊利石; Qp为石英粒内溶孔