Drilling in Sulige gas field shows that the distribution law of high-energy waterway in this field is the most important element to control effective reservoirdistribution. Sedimentary coarse sandstone of high-energy water way has highershear velocity, which has clear contrast to the shear velocity of shale, and makes the converted wave profile to show higher reflection amplitude. This is the most important basement to interpret gas reservoir with multiple and multicomponent.Utilizing model in this article proves that the converted wave reflection coefficient for gas-bearing sand and shale is about 4 times to the reflection coefficient for fine sand and shale. The model also shows that the longitudinal wave and converted wave have 180° phase difference at the area of Sulige. The phase for the converted wave profile should be consistent with that for the longitudinal wave profile during interpreting. Thus the consistent degree between the interpreting result and well is better.