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.

该气藏的造为造侵蚀而成的残丘山,储集为陶系碳酸盐岩溶蚀缝洞孔系,层状分布(集中分布于陶系峰峰组和上马家沟组上段)。