鄂尔多斯盆地北岔沟砂岩沉积特征及其对天然气成藏的控制作用*
黄建松1,2,5, 郑杰1,2, 宋翔1,2,5, 刘磊5, 易刚3,4,5, 杨萍5

Sedimentary characteristics of Beichagou Sandstone in the Lower Permian Shanxi Formation in Ordos Basin and its effects on natural gas accumulation
HUANG Jiansong1,2,5, ZHENG Jie1,2, SONG Xiang1,2,5, LIU Lei5, YI Gang3,4,5, YANG Ping5
鄂尔多斯盆地北岔沟砂岩显微特征 A—陕211井,2920.73 m,铸体薄片,单偏光×20,粗粒石英砂岩,硅质胶结为主,局部可见高岭石胶结,颗粒间呈镶嵌接触,发育残余粒间孔、岩屑溶孔和高岭石晶间孔;B—榆38井,3105.89 m,铸体薄片,正交偏光,中粒石英砂岩,硅质连晶胶结,颗粒间呈镶嵌接触,岩性致密;C—苏77-27-1井,2971.12 m,扫描电镜,残余粒间孔中充填次生石英晶体,次生石英晶体表面附着毛发状伊利石;D—苏77-27-1井,2969.18 m,扫描电镜,岩屑溶蚀孔隙,毛发状伊利石、菱铁矿及次生石英晶体对溶孔部分充填;E—苏77-27-1井,2971.12 m,扫描电镜,化学沉淀书页状高岭石集合体充填于粒间孔隙中,颗粒表面附着片丝状伊利石,高岭石晶间孔发育;F—苏77-2-15井, 3037.25 m,扫描电镜,石英次生加大普遍且强烈,颗粒之间呈镶嵌接触