It's a residual mountain(unaka) which were a set of thrust blocks under the erosion unconformity.It's reservoir pore space is a fracture-vug-pore system of Ordovician carbonate karst.

该构造为道冲构造侵蚀而成残丘山,储体为陶系碳酸盐岩溶蚀缝洞孔体系,流体呈层状分(分于陶系峰峰组和上马家沟组上段)。