鄂尔多斯盆地西部下古生界风化壳优质储集层发育规律及成因机制: 以桃2区块马家沟组马五<sub>1-4</sub>亚段为例<sup>*</sup>

鄂尔多斯盆地西部下古生界风化壳优质储集层发育规律及成因机制: 以桃2区块马家沟组马五_1-4亚段为例^*

冯强汉¹, 许淑梅^2,^3,⁴, 池鑫琪^2,³, 舒鹏程^2,³, 孔家豪^2,³, 崔慧琪^2,³, 马慧磊^2,³

Development regularity and genetic mechanism of weathering crust reservoirs in the western Ordos Basin: take the sub-members 1-4 of Member 5 of Majiagou Formation in Tao 2 block as an example

Feng Qiang-Han¹, Xu Shu-Mei^2,^3,⁴, Chi Xin-Qi^2,³, Shu Peng-Cheng^2,³, Kong Jia-Hao^2,³, Cui Hui-Qi^2,³, Ma Hui-Lei^2,³

鄂尔多斯盆地桃2区块马五_1-4亚段角砾岩 a—陕50井3500.0 m马五$马五_{4}^{1}$小层,位于季节性变化带下部的砾状支撑角砾岩,白云石角砾之间被泥质充填;b—桃34井3386.3 m$马五_{1}^{2}$小层,垂直渗流带沿裂缝溶蚀形成的角砾岩,进而形成的网缝镶嵌角砾岩;c—桃34井3444.0 m$马五_{4}^{1}$小层,滞流带岩溶流体沿裂缝下渗溶蚀形成的原位无明显位移网缝镶嵌状角砾岩;d—桃53井3388.5 m$马五_{1}^{4}$小层,底部泥质支撑角砾岩,角砾在渗流带原地或者准原地被渗流泥质胶结充填;e—桃35井3403.8 m$马五_{1}^{3}$小层,方解石胶结角砾岩,渗流带溶蚀及后期方解石胶结形成的角砾状白云岩,砾间被方解石胶结充填。均为岩心照片