角度域黏声介质高斯束叠前深度偏移方法  

Angle domain prestack Gaussian beam migration for visco-acoustic media

作　　者：代福材 黄建平[1] 李振春[1] 杨继东 杨宇 孔雪[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院地球物理系,山东青岛266580 [2]中国石油大学胜利学院油气工程学院,山东东营257061

出　　处：《石油地球物理勘探》2017年第2期283-293,共11页Oil Geophysical Prospecting

基　　金：国家"973"课题(2014CB239006);国家自然科学基金项目(41274124);国家油气重大专项课题(2016ZX05014001;2016ZX05002)联合资助

摘　　要：高斯束偏移方法作为一种改进的射线类偏移方法,兼具成像精度和计算效率高的优点。在传统高斯束叠前深度偏移方法的基础上,通过校正黏声介质对高斯束格林函数复值振幅及复值走时的影响,并结合高斯束传播过程中的角度信息,发展了适用于黏声介质的角度域高斯束叠前深度偏移方法,并给出了详细的实现流程。在实现算法的基础上,通过两个典型模型对本文方法进行测试,成像结果表明角度域黏声介质高斯束偏移方法可有效补偿黏声介质的吸收衰减作用,一定程度上提高了地震成像分辨率。As an improvement of ray migration methods, the Gaussian beam migration method has the advantage of high imaging accuracy and high computational efficiency. Based on conventional prestack Gaussian beam depth migration methods, we develop an angle domain prestack Gaussian beam depth migration method for visco-acoustic media, which modifies complex amplitude and complex traveltime of the Gaussian beam's Green function, and combines with the computation of the angle information in the Gaussian beams propagation process. Besides, we give the detailed implementation process. On the basis of the implementation of the algorithm, we test our method with two typical models. Result shows that the proposed method can compensate for attenuation effectively and partly improve the resolution of migrated images. © 2017, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.

关 键 词：黏声介质 高斯束偏移 角度域 衰减补偿 格林函数 

分 类 号：P631[天文地球—地质矿产勘探]