PP波和PS波联合AVO反演方法研究

发布时间：2018-06-14 10:55

本文选题：PP波 + PS波　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：AVO反演是利用振幅随偏移距的变化规律来估算储层岩石及流体的弹性参数并进行油气检测。通常情况下,是利用纵波AVO反演技术反演得到纵、横波速度和密度等弹性参数,然而纵波AVO反演往往不能获取准确的横波速度和密度信息。为此本文基于多波多分量地震资料,开展了PP波和PS波联合AVO反演方法的研究。针对无约束情况下的PP波和PS波联合AVO三参数反演存在的不适定问题,在测井资料充足情况下,本文从正则化反演角度,基于纵波井约束反演,将转换横波信息加入构建了由纵波、转换横波以及井资料组成的目标函数,提出了井约束下的PP波和PS波联合AVO反演方法;从概率化反演角度,将基于贝叶斯框架下的纵波AVO波形反演方法与PP、PS波联合AVO反演方法结合在一起实现了基于贝叶斯理论的PP和PS波联合AVO波形反演来得到高精度和高分辨率的三参数反演结果。针对井资料缺乏的地震工区,AVO反演存在密度反演不准确的问题,本文提出了PP波和PS波分步联合AVO反演方法。即首先通过两参数联合反演纵横波速度,以反演出来的纵波速度作为已知量并舍弃得到的横波速度,再通过两参数联合反演得到横波速度和密度以得到准确的三参数反演结果。本文通过测井数据合成道集、Marmousi2模型和某工区实际资料来测试检验本文提出的PP波和PS波联合AVO反演方法,模型测试表明三种PP波和PS波联合AVO反演方法都能得到相对准确的反演三参数,证明了PP波和PS联合AVO反演方法的可行性。实际资料测试说明了PP波和PS波分步联合AVO反演方法的实用性。
[Abstract]:AVO inversion is to estimate the elastic parameters of reservoir rocks and fluids and to detect oil and gas by using the variation of amplitude with offset. In general, P-wave AVO inversion technique is used to obtain elastic parameters such as longitudinal, shear wave velocity and density. However, P-wave AVO inversion is often unable to obtain accurate S-wave velocity and density information. Therefore, based on multiwave and multicomponent seismic data, the research of PP wave and PS wave combined AVO inversion method is carried out in this paper. Aiming at the ill-posed problem of PP wave and PS wave combined AVO three-parameter inversion under unconstrained condition, under the condition of sufficient logging data, this paper, from the angle of regularization inversion, is based on P-wave constraint inversion. The objective function composed of P-wave, converted S-wave and well data is constructed by adding the converted S-wave information, and a joint AVO inversion method of PP wave and PS wave under well constraint is proposed, which is based on probabilistic inversion. The P-wave AVO waveform inversion method based on Bayesian framework is combined with PPPS-wave combined AVO inversion method to realize PP and PS wave combined AVO waveform inversion based on Bayesian theory to obtain high precision and high resolution three-parameter inversion results. Aiming at the problem of inaccuracy of density inversion in AVO inversion in seismic work area where well data is lacking, a step by step combined AVO inversion method of PP wave and PS wave is proposed in this paper. That is to say, the velocity of P-S wave is firstly inversed by two parameters, the velocity of P-wave is used as known quantity and the velocity of S-wave is discarded, then the velocity and density of S-wave are obtained by joint inversion of two parameters to get the accurate result of three-parameter inversion. In this paper, the combined AVO inversion method of PP wave and PS wave is tested and verified by combining the Marmousi2 model with logging data and the actual data of a certain working area. The model tests show that the three kinds of PP wave and PS wave combined AVO inversion methods can obtain relatively accurate inversion parameters, which proves the feasibility of PP wave and PS combined AVO inversion method. The practical data show the practicability of PP wave and PS wave step by step AVO inversion method.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631.4

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