Similarity analysis of volcanic and karst landforms and the exploration revelation

Through the actual comparison of field outcrops, it is found that both lava tunnels and karst caves are horizontal strip spaces formed by corridors and halls, and their formation is related to the erosion of rock layers by fluids. In the later period, they mainly experience mechanical collapse and sedimentary filling failure.Both caldera and karst funnel are funnel-shaped depressions with steep pipes near the center. They are formed by rock collapse on the basis of lava ejection and flowing water infiltration channels, and mainly go through sedimentation and filling in the later period. Scoria lava and karst stone bud landform are zonal and sheet rock groups formed by the horizontal and vertical arrangement of broken rock blocks. They are caused by collapsed rock stratums surrounding tunnels of lava or water flows. Both are easily remolded by sedimentary filling.Scoria and clint are complex arranged bond-like and/or sheet-like broken rocks. Fractures and pores/caves are easily found and mainly filled by sediment and/or chemical minerals. The similar structural morphology and the post-reconstruction process make the type of reservoir space after burial similar to the distribution.Therefore, the existing research results of carbonate fracture-cavern reservoirs can be used for reference to guide the distribution prediction and evaluation of volcanic rock reservoirs.