摘要
在海洋宽频地震处理技术中,鬼波压制是拓宽地震资料频带、提高地震资料分辨率的关键,常用方法是在预测鬼波的基础上,将其从全波场中消除。显然精确地预测鬼波是鬼波压制技术的难点。依据格林函数理论,提出了基于鬼波传播的射线路径预测鬼波波场的多次迭代技术及流程,结合研发的曲波域匹配相减技术,有效压制了鬼波。由于预测鬼波波场较为复杂,导致在匹配相减时会出现损伤一次波或鬼波未彻底压制等情形。为此,进一步引入多次迭代思想,将匹配相减后得到的一次波的波场作为输入,再次通过格林函数预测鬼波并相减,得到更干净的一次波场;历经多次迭代可逐步提高鬼波预测的精度。模型数据和实际资料的处理结果表明,该方法在压制鬼波的同时能更好地保护一次波。
As one of the marine broadband seismic data processing techniques,deghosting is the key to broadening the frequency band and improving the resolution of seismic data.The commonly used deghosting method is removing the predicted ghost from the whole wave field.Evidently,the ghost is hard to predict accurately.According to Green’s theorem,we proposed the iterative techniques and flow to predict the ghost based on its ray path.The technology is then combined with the developed matching subtraction techniques in the curvelet domain,effectively suppressing ghost. The complexity of predicted ghost tended to cause damage to primary waves or incomplete deghosting during matching subtraction.Therefore,multiple iterations are introduced.The primary wave field after matching subtraction is taken as input to predict the ghost again by Green’s theorem followed by subtraction.After several iterations,we can improve the accuracy of ghost prediction and get a better primary wave.The test of model data and real seismic data manifests that the proposed method can preserve more primary waves during the deghosting.
作者
宋建国
马安
黄晟
刘炯
陈飞旭
SONG Jianguo;MA An;HUANG Sheng;LIU Jiong;CHEN Feixu(Shangdong Provincial Key Laboratory of Deep Oil&gas,Qingdao,Shangdong 266580,China;School of Geosciences,China University of Petroleum(East China),Qingdao,Shandong 266580,China;Hainan Company,China National Offshore Oil Corporation,Haikou,Hainan 570311,China;Petroleum Exploration and Production Research Institute,SINOPEC,Beijing 100083,China;Exploration and Production Research Institute,Tarim Oilfield Company,PetroChina,Korla,Xinjiang 841000,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2022年第1期91-100,I0004,共11页
Oil Geophysical Prospecting
基金
国家科技重大专项“陆相页岩油甜点地球物理识别与预测方法”(2017ZX05049-002)
国家自然科学基金面上项目“叠前数据挖掘与储层参数非线性预测”(41674125)
中石油重大科技项目“塔里木盆地深层复杂高陡构造与碳酸盐岩储层地震速度建模及成像关键技术研究”(ZD2019-181-003)
中国石油大学2021年研究生创新工程资助项目“基于格林函数的自由表面多次波压制方法研究”(YCX2021026)联合资助。
关键词
鬼波压制
格林函数
多次迭代
曲波变换
海上宽频地震
deghosting
Green’s theorem
multi-iteration
curvelet transform
marine broadband seismic
