Abstract: This paper solves the wave equations by means of finite-difference method and studies the carbonate cave reservoir in Tazhong area, the corresponding position relations between the cave and the string bead-like reflectance, the tuning phenomenon between the top and bottom of the cave and the genetic mechanism of various string bead-like forms. The results indicate that the cave locates in the central position of string bead-like reflectance; the top of cave locates in wave trough, the bottom of it located in the wave peak shifts down with its height; the demarcation line of tuning phenomenon of the top-bottom reflectance is about 120 m; the various string bead-like forms is resulted from unsuitable migration aperture and migration velocity. The recognition can be instructive for exploration and development of carbonate cave- fractured reservoirs.

Key words: Tarim basin, carbonate reservoir, string bead-like reflectance, wave equation, forward modeling