Anyue gas field of the Lower Cambrian Longwangmiao Formation in Sichuan Basin is the largest carbonate gas reservoir discovered so far in China. With the promotion of gas exploration, many gas wells with daily production capacity of million cubic meters have appeared in Moxi-Gaoshiti area in Central Sichuan. However, the reservoir development of Longwangmiao Formation in the adjacent Longnvsi structure is quite different from that in Moxi-Gaoshiti area, and the logging response characteristics of different karst facies zones in carbonate karst strata of Longwangmiao Formation in Longnvsi area are not clear. Taking the carbonate karst formation of Longwangmiao Formation in Longnvsi structure as an example, based on core calibration imaging logging and conventional logging curves, the identification mode of dissolution vugs and fractures is established to identify the karst formation. The karst reservoir of Longwangmiao Formation in Longnvsi area is divided into three types, including fracture-vug, fracture-pore and pore. The logging response characteristics of carbonate karst strata of Longwangmiao Formation in Longnvsi area are further studied. The results show that the carbonate karst facies zones of Longwangmiao Formation in Longnvsi area can be divided into superficial karst zone, vadose karst zone and underflow karst zone. The superficial karst zone is sporadically distributed with thin thickness, and all karst vugs are filled. The logging data show high gamma and low resistivity, and breccia mixed accumulation can be seen on the electrical imaging. Dendritic karst caves and fractures are developed in the vadose karst zone, most of the karst vugs are filled. The logging data show low gamma and high resistivity，and irregular dark spots and sinusoidal black bands are seen in electrical imaging. Medium-large karst vugs are developed in the underflow karst zone, and the dissolution vugs are commonly distributed along the layer. The logging data show low gamma and low resistivity, and irregular patches or spots and sinusoidal black strips are seen on the electrical imaging.