The problem and countermeasure in seiamic survey in southern marine carbonate area of China

The marine carbonate petroliferous area is wide in south China.Complicated geologic condition and interference wave lead to low S/N ratio, so improving S/N ratio is very important. The paper is analyzed the problem and cause facing to seismic survey aimed to seismic geologic character, such as complicated surface including water system in plain,outcrop in carbonate area and outcrop in sand-shale area; the old stratum age, the reflection signal poorly; as well as complicated subsurface structures. Structure survey in surface geology, shot receiving factor, interference wave and observation system design are discussed. Finally, corresponding countermeasure and technology are proposed according to exploration practice.