Abstract:

In this paper，the mechanism of movable pressure—variable volume karst is provided for the study of the effect and characteristics of carbonate fissure—cavern system karst. The author thinks that horizontal stress field mainly controls the intensity and distribution of fissure—cavern system karst，and fissure—cavern system karst effect is one of the factors that bring about such geologic phenomena as the abnormal high pressure in gas reservoir and the wider distribution of gas concentration.

Key words: Horizontal telluric stress, Solution fissure, Fissure—cavern system, Corrosion effect, Fissure—cavern reservoir