The latest survey and study in the Qiong Dongnan basin found a lot of seismic reflection interfaces with suspected BSR(bottom simulating reflector)features,but the BSR features aren't typical.Accurate identification of BSB is very important for evaluation of gas hydrates.To evaluate gas hydrates is a challenge where BSR features aren't obvious.We conducted the correlative analyses between the gas hydrate occurrence and tectonics,sedimentation,and origin gas.All evidences indicate that in the central depress...