奥陶系

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.

该气藏的构为道冲构而成的残丘山,储集体为奥陶系碳酸盐岩溶缝洞孔体系,流体呈层状分(集中分于奥陶系峰峰组和上马家沟组上段)。