步进迭代法测井与井旁地震资料匹配处理  

Well logging and well-side seismic data matching based on step-by-step iterative method

作　　者：宋建国[1] 程亮 孟宪军[2] 魏国华[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石化胜利油田分公司物探研究院,山东东营257022

出　　处：《石油地球物理勘探》2016年第1期80-86,19-20,共7页Oil Geophysical Prospecting

基　　金：国家"863"课题(2011AA060301);国家科技重大专项(2011ZX05006-002)联合资助

摘　　要：针对测井资料在地震频带范围内与井旁道难以匹配的问题,提出了步进迭代法对测井资料进行降频处理:1根据测井资料计算初始反射系数,利用自相关法从井旁道提取初始地震子波;2用初始子波作为约束,从井旁道提取新的地震子波;3用初始反射系数作为约束,从井旁道提取新的反射系数;4判断新的地震子波与反射系数的褶积是否与井旁道匹配,如果不匹配则用新的地震子波和反射系数替换初始地震子波和反射系数,并回到步骤2。如此迭代,直到地震子波与反射系数的褶积与井旁道吻合。该方法降低了测井资料的频率,使两种资料在中、低频范围内相互匹配。匹配后的反射系数与高频地震子波褶积,形成拟井间地震记录,用于联合拓频,有效地提高了地震资料分辨率。It is difficult to match well logging data with well-side seismic data in seismic frequency band.We propose here a step-by-step iterative method for this purpose.The method consists of the following steps.1We calculate an initial reflection coeffecient from well logging data,then extract an initial seismic wavelet from a well-side seismic trace with auto-correlation;2With constraint of the initial wavelet,we extract new seismic wavelet from the well side seismic trace;3With constraint of the initial reflection coeffecient,we extract new reflection coeffecient from the well side seismictrace;4If the convolution of the new seismic wavelet and the reflection coeffecient do not match with the well-side seismic trace,we replace the intial seismic wavelet with new seismic wavelet,and the initial reflection coeffecient with new reflection coeffecient,and then back to the step 2.This step-by-step iterative process is repeated until the synthetic seismogram convolved by reflection coeffecient and seismic wavelet consistent with the well-side seismic trace.This method downgrades logging data frequency so logging data in the mid and low-frequency range can be matched with surface seismic data.Then Ricker wavelet convolves with matched reflection coeffecient to construct pseudo cross-well data.The pseudo cross-well data can improve 3Dseismic data resolution with joint frequency expanding method.

关 键 词：联合拓频 测井资料 地面地震资料 步进迭代法 匹配处理 

分 类 号：P631[天文地球—地质矿产勘探]