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亚段膏云岩膏模孔的特征及充填情况(Ⅰ) a—陕225井3429.14 m$马五_{3}^{1}$小层,膏云岩硬石膏晶模孔被微亮晶和亮晶方解石全充填,岩性致密,10×4(-);b—桃35井3394.36 m$马五_{1}^{1}$小层,膏云岩的盐模孔被微亮晶和亮晶方解石全充填,岩性致密,10×4(-);c—桃53井3381.55 m$马五_{1}^{3}$小层,膏云岩的硬石膏结核模孔被渗滤白云石粉砂充填,呈假示底构造,残余膏模孔孔隙发育,红色铸体, 10×4(-);d—桃47井3427 m$马五_{1}^{3}$小层,膏云岩中膏模孔被渗滤白云石粉砂半充填,见残余膏模孔孔隙,蓝色铸体,10×10(-);e—桃38井3410.3 m$马五_{2}^{2}$小层,膏云岩中膏模孔被渗滤白云石粉砂和方解石半充填,残余膏模孔大量保存,茜素红染色,蓝色铸体,10×10(-);f—陕50井3490.2 m$马五_{4}^{1}$小层,膏云岩的膏模孔充填方解石和白云石粉砂,见残余膏模孔孔隙,茜素红染色,蓝色铸体,10×4(-);g—桃53井3381.55 m$马五_{1}^{3}$小层,膏云岩的石膏晶体模孔被自生石英和渗滤白云石粉砂充填,显示假示底构造,红色铸体,10×4(-);h—召88井3327.3 m$马五_{1}^{2}$小层,膏云岩中膏模孔被渗滤白云石粉砂、自生石英和方解石全充填,孔隙不发育,茜素红染色,蓝色铸体,10×4(-);j—召88井3329.3 m$马五_{1}^{2}$小层,膏云岩中膏模孔被渗滤白云石粉砂、自生石英和方解石全充填,岩性致密,茜素红染色,10×4(-)