鄂尔多斯盆地马家沟组准层状岩溶角砾岩特征及其成因*
张欣玥1,2, 李凌1,2, 张道锋3, 易刚4, 吴东旭5, 钟寿康1,2, 杨梦颖1,2, 熊鹰1,2, 肖笛1,2, 谭秀成1,2

Characteristics and genesis of quasi-stratified karst breccia of the Majiagou Formation in Ordos Basin
ZHANG Xinyue1,2, LI Ling1,2, ZHANG Daofeng3, YI Gang4, WU Dongxu5, ZHONG Shoukang1,2, YANG Mengying1,2, XIONG Ying1,2, XIAO Di1,2, TAN Xiucheng1,2
苏里格气田东北部马家沟组上组合B1(a-f)和B2(g-i)型角砾岩特征 a—浅灰色角砾与褐灰色填隙物,角砾内可见膏模孔,3307.55 m,马五4亚段,SD47-42井; b—灰色角砾与褐灰色填隙物,角砾具可拼合特征,3236.00 m,马五1亚段,T36井; c—膏模孔泥粉晶云岩,虚线部分勾绘的为不规则角砾雏形,3446.37 m,马五4亚段,Zh97井; d—大小、形态各异的角砾,邻近角砾可拼接,3445.06 m,马五3亚段,单偏光,T51井; e—具溶蚀港湾状边缘和示顶底构造的角砾,3309.28 m,马五4亚段,单偏光,SD47-42井; f—具港湾状溶蚀边(右下)和旋转位移(左上)的角砾,3659.81 m,马五4亚段,单偏光,T44井; g—高频暴露面,之上为后期高频海侵泥质沉积,之下为后期泥质填隙的不规则角砾,3126.65 m,马五3亚段,G1-13井; h—泥质角砾岩,见泥粉晶云岩(左下)、纹层状泥粉晶云岩(左上)及膏模孔泥粉晶云岩(右上)角砾,3400.70 m,马五4亚段,单偏光, T60井; i—泥粉晶灰岩角砾与粘结砂屑灰岩角砾,残余砾间孔被泥质充填,3599.41 m,马五4亚段,单偏光,T13井