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-Mei2,3,4, Chi Xin-Qi2,3, Shu Peng-Cheng2,3, Kong Jia-Hao2,3, Cui Hui-Qi2,3, Ma Hui-Lei2,3
鄂尔多斯盆地桃2区块马五1-4亚段(含)膏云岩的膏模孔特征及与之伴生的胀缩微裂缝 a—陕225井3429.19 m$马五_{3}^{1}$小层,膏云岩的石膏晶体模孔被微亮晶和亮晶方解石全充填,岩性致密,紫色铸体,10×4(-);b—桃53井3381.3 m$马五_{1}^{2}$小层,粉晶膏云岩中膏模孔被白云石粉砂、石英、方解石局部充填形成残余膏模孔,显假示底结构,胀缩微裂缝发育,红色铸体,10×4(-);c—召88井3327.30 m$马五_{1}^{2}$小层,粉晶膏云岩中膏模孔局部被充填,胀缩微裂缝发育并连通膏模孔,蓝色铸体,10×4(-);d—桃53井3381.50 m$马五_{1}^{2}$小层,膏云岩的膏模孔被白云石粉砂和萤石局部充填,胀缩微裂缝与膏模孔伴生发育,蓝色铸体,10×4(-);e—桃47井3427.0 m$马五_{1}^{1}$小层,膏云岩中的胀缩微裂缝与膏模孔伴生发育并连通不同的膏模孔,后被有机质局部充填,蓝色铸体, 10×4(-);f—陕225井3455.90 m$马五_{4}^{1}$小层,粉晶膏云岩中未充填的膏模孔,胀缩微裂缝与之伴生发育,紫色铸体,10×4(-)