油田开发阶段叠后地震反演影响因素研究
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摘要
测井信息与地震信息观测时间不同引起的误差对地震反演结果有较大影响,这在油田开发中、晚期的地震勘探中尤为明显,但这一种影响因素却往往被忽视。以准噶尔盆地西北缘某油田开发区叠后地震反演为例,在测井信息与地震信息观测时间不同条件下,对影响叠后地震反演结果的混合相位子波提取、初始速度模型建立和多井约束等问题进行了分析。在单井初始速度模型建立、地震子波与相位多井统计,以及单井叠后反演约束与适当叠后反演约束的条件下,叠后地震反演可以获得空间相对保持的储层波阻抗信息。
The errors caused by observation time differences between well log and seismic data may have greater influences over seismic inversion,which is particularly obvious during the middle-late period of oilfield production.However,these influences are commonly neglected.Using a production area in an oilfield along the northwest margin of Junggar Basin as a case,several problems to influence post-stack seismic inversion,such as mixed-phase wavelet extraction,initial velocity model building and multi-well constraints,are analyzed under different observation times between well log and seismic data.When the initial model is built through a single well,the seismic wavelet and phase are extracted statistcally from multiple wells,and the single-well constraint is applied,the relative spatial impedance information of a reservoir can be obtained by post-stack seismic inversion.
The errors caused by observation time differences between well log and seismic data may have greater influences over seismic inversion,which is particularly obvious during the middle-late period of oilfield production.However,these influences are commonly neglected.Using a production area in an oilfield along the northwest margin of Junggar Basin as a case,several problems to influence post-stack seismic inversion,such as mixed-phase wavelet extraction,initial velocity model building and multi-well constraints,are analyzed under different observation times between well log and seismic data.When the initial model is built through a single well,the seismic wavelet and phase are extracted statistcally from multiple wells,and the single-well constraint is applied,the relative spatial impedance information of a reservoir can be obtained by post-stack seismic inversion.
引文
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[4]凌云,晓宇,孙德胜,等.薄储层叠后反演影响因素分析与地震属性解释研究[J].石油物探,2008,47(6):531-558.
[2]FRANCIS A.Acoustic impedance inversion pitfalls and somefuzzy analysis[J].The Leading Edge,1997,26(3):275-280.
[3]HUANG X,KELKAR M,CHOPRA A,et al.Wavelet sensi-tivety study on inversion using heuristic combinatorial algo-rithms[C].SEG,Expanded Abstract,1995:1088-1090.
[4]凌云,晓宇,孙德胜,等.薄储层叠后反演影响因素分析与地震属性解释研究[J].石油物探,2008,47(6):531-558.
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