鄂尔多斯盆地奥陶系马家沟组四段沉积特征及其控储效应*
吴东旭1,2, 喻建3, 周进高1,2, 吴兴宁1,2, 于洲1,2, 丁振纯1, 王少依1, 李维岭1, 蔡君1

Sedimentary characteristics and reservoir controlling effect of the Member 4 of Ordovician Majiagou Formation in Ordos Basin
Wu Dong-Xu1,2, Yu Jian3, Zhou Jin-Gao1,2, Wu Xing-Ning1,2, Yu Zhou1,2, Ding Zhen-Chun1, Wang Shao-Yi1, Li Wei-Ling1, Cai Jun1
鄂尔多斯盆地奥陶系马家沟组四段典型沉积微相宏观及微观特征 A—桃112井,3714.35m,马四2亚段,粉、细晶白云岩,残余颗粒结构(砂屑、鲕粒等),发育晶间孔,蓝色铸体薄片,单偏光;B—双168井,7-3/61,马四1亚段,灰色生屑云岩,生屑以腕足类、介壳类为主,发育溶孔,岩心照片;C—桃112井,3624.05m,马四2亚段,粉晶白云岩,发育白云石晶间孔(微孔),蓝色铸体薄片,单偏光;D—鸭子坪露头,马四1亚段,灰褐色薄层膏结核泥粉晶白云岩(膏模孔大小1~3mm);E—西磑口露头,马四3亚段,褐灰色厚层云斑灰岩,生物扰动作用形成;F—米76井,7-9/62,马四2亚段,含云泥晶灰岩,近水平含泥纹层发育,普通薄片,单偏光;G—苏377井,7-5/37,马四1亚段,残余砂屑细晶白云岩,发育晶间孔,蓝色铸体薄片,单偏光;H—苏318井,5-12/13,马四2亚段,藻砂屑粉晶白云岩,溶孔发育,蓝色铸体薄片,单偏光;I—苏51井,3617.39m,马四1亚段,粉晶白云岩,普通薄片,单偏光