摘要
柴达木盆地英雄岭地区地表条件复杂,地形起伏大,多是悬崖峭壁,采集条件极为恶劣,并且不同区块间采集参数差异大,数据缺失、空间采样不足及覆盖次数不均匀等不规则问题突出,严重影响了偏移成像质量,所以必须进行叠前数据规则化处理。传统的匹配追踪Fourier变换插值(Matching Pursuit Fourier Interpolation,MPFI)方法通过迭代提取频谱中能量极大值重构正交基,使泄漏到其他频率的能量最小化,但无法克服空间假频的影响,而改进的MPFI方法利用低频部分作为约束条件可以达到抑制高频中假频成分的目的,从而同时解决频谱泄漏和假频问题。采用改进的MPFI技术对英雄岭地区的三维连片地震数据进行规则化处理,能较好地解决数据不规则问题,具有保真、抗噪能力,改善了断裂破碎带成像质量,为后续储层预测和油藏评价奠定了基础。
The surface condition in the Yingxiongling area of the Qaidam Basin is complex with many cliffs,and different surveys have different acquisition parameters.This resulted in serious irregularities in traces,spatial samples and coverage,and consequently artifacts in seismic imaging results.To get accurate images of subsurface structures,data regularization is indispensable.Conventional MPFI(Matching Pursuit Fourier Interpolation)can"re-orthogonalize"the Fourier basis functions through iteratively subtracting the Fourier component with the maximum energy from original data to minimize the leakage from one frequency to another,but it suffers from aliasing.Improved MPFI can suppress alias at high frequency by using low frequency as a prior.In this paper,MPFI was applied to regularize the geometry of 3 Dland multisurvey recorded in the Yingxiongling area of the Qaidam Basin.The result shows that improved MPFI can provide a promising approach for reconstructing the missing data while preserving amplitude and removing noises,and improve the image of the fault crushed zone.It lays a foundation for subsequent reservoir prediction and evaluation.
作者
凌越
刘伟明
肖明图
张小美
LING Yue;LIU Weiming;XIAO Mingtu;ZHANG Xiaomei(Research Institute of Petroleum Exploration&Development-Northwest,PetroChina,Lanzhou,Gansu 730020,China)
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2020年第S01期25-32,5,共9页
Oil Geophysical Prospecting
基金
国家科技重大专项“前陆冲断带及复杂构造区地震成像关键技术与构造圈闭刻画”(2016ZX05003-003)资助
关键词
数据规则化
匹配追踪
反假频
连片处理
data regularization
matching pursuit
anti-aliasing
multi-survey joint processing
作者简介
凌越,工程师,1988年生,2010年获东华理工大学固体地球物理学专业学士学位,2014年获同济大学固体地球物理学专业硕士学位,现在中国石油勘探开发研究院西北分院从事地震资料处理与偏移成像工作。Email:lingyue8@163.com
