鄂尔多斯盆地上古生界致密砂岩气田储集层特征与成因*
付金华1,3, 魏新善2,3, 南珺祥2,3, 石小虎2,3

Characteristics and origin of reservoirs of gas fields in the Upper Paleozoic tight sandstone, Ordos Basin
Fu Jinhua1,3, Wei Xinshan2,3, Nan Junxiang2,3, Shi Xiaohu2,3
鄂尔多斯盆地上古生界致密砂岩储集层微观照片 1—莲7井,4012.10 m,假杂基充填孔隙的千枚岩屑,正交偏光;2—莲7井,4010.10 m,硅质加大发育,单偏光;3—陕255井,盒8下,3273.96 m,砾状巨粗粒石英砂岩,岩屑溶孔及粒间孔,孔隙度为8.4%,渗透率为1.8×10-3 μm2,单偏光;4—陕291井,盒8下,3650.45 m,中粒岩屑砂岩,塑性岩屑压嵌,无显孔,单偏光;5—陕375井,3392.00 m,绿泥石膜,粒间孔可见,单偏光;6—陕333井,盒8下,3780.90 m,火山岩岩屑含量7%,全部溶蚀,单偏光