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<sup>*</sup>

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-Xu^1,², Yu Jian³, Zhou Jin-Gao^1,², Wu Xing-Ning^1,², Yu Zhou^1,², 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白云岩储集层岩石结构及孔隙特征 A—莲6井,4301.4 m,马四₁亚段,粉晶白云岩,发育粒间孔,见残余颗粒,红色铸体薄片,单偏光;B—察1井,3673.66m,马四₁亚段,残余颗粒白云岩,白云石半自形—自形,发育晶间孔,红色铸体薄片,单偏光;C—苏318井,5-12/13,马四₂亚段,藻砂屑粉晶白云岩,顺层溶蚀,被白云石半充填,蓝色铸体薄片,单偏光;D—定探1井,3930.30m,马四₁亚段,细晶—粉晶白云岩,晶间孔(溶孔)发育,蓝色铸体薄片,单偏光;E—靳6井,3688.43m,马四₂亚段,残余砂屑粉—细晶白云岩,发育晶间孔,部分被方解石充填,红色铸体薄片,单偏光;F—定探1井,3944.20m,马四₁亚段,粉—细晶白云岩,溶蚀孔洞发育,蓝色铸体薄片,单偏光;G—苏45井,3793.68m,马四₁亚段,粉晶白云岩,发育溶蚀孔洞,石英半充填,蓝色铸体薄片,单偏光;H—合探1井,3847.85m,马四₂亚段,粗粉晶白云岩,发育溶蚀孔洞,孔径约2cm,白云石半充填,岩心;I—苏32井,3639m,马四₁亚段,灰色粗粉晶白云岩,发育溶缝,宽0.2~2cm,白云石半充填,岩心