Abstract: Quantitative analysis on fracture?cave bodies’lateral minimum resolution range is a practical problem for the prospecting and development of fracture?cave carbonate reservoirs. This paper derives a spatial wavelet function using the double?focusing theory, analyzes the minimum lateral resolution range based on criteria of Rayleigh and Rickers theoretically. It is considered that the minimum lateral resolution range of point scatterer could be 1/2 of the main lobe width of the spatial wavelets approximately, whose value is proportional to seismic wave length and shows an inverse correlation with the sine value of the maximum emergence angle. Seismic forward modeling is performed from the perspective of practical application, which provides a precision basis of the minimum lateral resolution range of fracturecave bodies for actual production