叠前时间偏移技术在南海水合物地震资料处理中的应用

叠前时间偏移处理技术是复杂地区地震资料高精度成像处理的有效手段。从偏移技术方法原理和处理流程入手，讨论了偏移参数选择和速度分析等关键技术，并将其应用于南海水合物地震资料处理中，获得了准确的叠前时间偏移速度场，提高了研究区水合物层段的地震成像质量。处理效果显示，叠前时间偏移剖面较叠后偏移剖面成像精度明显提高，剖面波组特征突出，地层反射信息丰富，有效地提高了水合物解释的准确性。

Application of Prestack Time Migration Processing Technique to Gas Hydrates Seismic Data Processing in the South China Sea

Prestack time migration processing technique is an effective processing means for high precision seismic data imaging processing in the areas of complex structures.Based on deep understanding of the methodology and processing flow,this paper discussed key technologies such as migration parameters and migration velocity analysis,and obtained the proper migration velocity field and high imaging precision seismic sections by applying prestack time migration processing technique to gas hydrates seismic data processing in the South China Sea.Compared to poststack time migration,the results of practical data processing using prestack time migration show that imaging precision of sections are improved greatly,and reflection characteristics of various geological information are more abundant,which can improve the accuracy of gas hydrates interpretation effectively.