扩展弹性阻抗理论入射角与实际入射角的等效关系研究
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摘要
弹性阻抗相对声阻抗的优势除了叠前数据包含更多的岩性与流体信息外,还有就是可以进行多角度分析。而通过不同入射角下的弹性阻抗反演,可能会发现不同岩性和流体随入射角的变化异常。但是最适合实际应用的扩展弹性阻抗反演对应的入射角是一个经过扩展的理论入射角,不是地震资料的实际入射角,因此找到两种角度之间的等效关系,是利用扩展弹性阻抗反演进行岩性和流体检测首先要解决的关键问题。从弹性阻抗和扩展弹性阻抗的定义出发,通过分析两种弹性阻抗之间存在的内在关系,提出了一种寻找两种角度等效关系的新方法——根据实际入射角对应的弹性阻抗值和理论入射角对应的扩展弹性阻抗值,分别计算反射系数序列,进而进行相关运算.获取它们之间的等效关系。实际资料的计算结果表明方法是可行的,相关系数可达到99.9%,角度等效关系可达到任意精度。
Comparing with the acoustic impedance,we know that the e- lastic impedance contains more information of lithology and fluid in pre-stack data and can be analyzed from multi aspects.Through e- lastic impedance inversion with different incident angles,the abnor- mity of various lithology and fluids with the change of incident an- gle may be found out.However,most suitable incident angles for actual application of extended elastic impedance inversion are ex- tended theoretical incident angles,not the actual incident angles of seismic data.Therefore,the equivalent relation of the two angles should be found out firstly in detecting lithology and fluid by using extended elastic impedance inversion.Starting from the definition of elastic impedance and extended elastic impedance,through analy- zing the inner relation between the two impedances,a new method was proposed for hunting the equivalent relation.The principles of the method are as follows:in terms of the elastic impedance for ac- tual incident angle and the extended elastic impedance for theoreti- cal incident angle,the reflectivity sequences were separately compu- ted,and then correlation computation was carried out to obtain the equivalent relation between them.The computation results show the method is feasible,correlation coefficient can reaches 99.9%, and angle equivalent relation can obtain arbitrary accuracy.
Comparing with the acoustic impedance,we know that the e- lastic impedance contains more information of lithology and fluid in pre-stack data and can be analyzed from multi aspects.Through e- lastic impedance inversion with different incident angles,the abnor- mity of various lithology and fluids with the change of incident an- gle may be found out.However,most suitable incident angles for actual application of extended elastic impedance inversion are ex- tended theoretical incident angles,not the actual incident angles of seismic data.Therefore,the equivalent relation of the two angles should be found out firstly in detecting lithology and fluid by using extended elastic impedance inversion.Starting from the definition of elastic impedance and extended elastic impedance,through analy- zing the inner relation between the two impedances,a new method was proposed for hunting the equivalent relation.The principles of the method are as follows:in terms of the elastic impedance for ac- tual incident angle and the extended elastic impedance for theoreti- cal incident angle,the reflectivity sequences were separately compu- ted,and then correlation computation was carried out to obtain the equivalent relation between them.The computation results show the method is feasible,correlation coefficient can reaches 99.9%, and angle equivalent relation can obtain arbitrary accuracy.
引文
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5 Ezequiel F,Tapan M,Gary M.Near and far offset P- to-S elastic impedance for discriminating fizz water from commercial gas[J].The Leading Edge,2003,22 (10):1012～1015
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11彭真明，李亚林，巫盛洪，等．碳酸盐岩储层多角度弹性阻抗流体识别方法[J]．地球物理学报，2008，51(3)：881～885
12彭真明，李亚林，魏文阁，等．粒子滤波非线性AVO反演方法[J]．地球物理学报，2008，51(4)：1218～1225
13陈天胜，魏修成，刘洋．一种新的各向异性弹性阻抗近似公式[J]．石油物探，2006，45(6)：563～569
14管路平．地震叠前反演与直接烃类指示的探讨[J]．石油物探，2008，47(3)：228～234
15 Aki K,Richards P G.Quantitative seismology:theory and methods[M].San Francisco:W.H.Freeman and Company,1980.86～88
2 Whitcombe D N.Elastic impedance normalization[J]. Geophysics,2002,67(1) :60～62
3 Whitcombe D N,Connolly P A,Reagan R L,et al. Extended elastic impedance for fluid and lithology pre- diction[J].Geophysics,2002,67(1 ) :63～67
4 Duffaut K,Alsos T,Rogn(?) H,et al.Shear-wave elas- tic impedance[J].The Leading Edge,2000,19 ( 11 ) : 1222～1229
5 Ezequiel F,Tapan M,Gary M.Near and far offset P- to-S elastic impedance for discriminating fizz water from commercial gas[J].The Leading Edge,2003,22 (10):1012～1015
6马劲风．地震勘探中广义弹性阻抗的正反演[J]．地球物理学报，2003，46(3)：118～124
7甘利灯，赵邦六，杜文辉，等．弹性阻抗在岩性与流体预测中的潜力分析[J]．石油物探，2005，44(5)：504～508
8倪逸．弹性波阻抗计算的一种新方法[J]．石油地球物理勘探，2003，38(2)：147～150
9王保丽，印兴耀，张繁昌．弹性阻抗反演及应用研究[J]．地球物理学进展，2005，20(1)：89～92
10彭真明，李亚林，梁波，等．叠前弹性阻抗在储层气水识别中的应用[J]．天然气工业，2007，38(4)：43～45，52
11彭真明，李亚林，巫盛洪，等．碳酸盐岩储层多角度弹性阻抗流体识别方法[J]．地球物理学报，2008，51(3)：881～885
12彭真明，李亚林，魏文阁，等．粒子滤波非线性AVO反演方法[J]．地球物理学报，2008，51(4)：1218～1225
13陈天胜，魏修成，刘洋．一种新的各向异性弹性阻抗近似公式[J]．石油物探，2006，45(6)：563～569
14管路平．地震叠前反演与直接烃类指示的探讨[J]．石油物探，2008，47(3)：228～234
15 Aki K,Richards P G.Quantitative seismology:theory and methods[M].San Francisco:W.H.Freeman and Company,1980.86～88
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