Abstract: The Peng-2 gas pool(Jp2) is believed to be highly prospective at present in the Majing Gas Field,western Sichuan.The reservoir rocks in general consist of the delta plain-delta front deposits including the disrtibutary channel and channel mouth bar microfacies,which have the geophysical logs with low gamma-ray logs,low density,low neutron logs,high acoustic logs and high electrical resistivity logs,and the seismic responses with low frequency,strong amplitude and low impedance.The research of reservoir characteristics may assist in the improvement of our knowledge of the reservoirs and further exploration in the study area.