石油地球物理勘探最新文献

英文中文

Influences of coal seam on seismic reflection characteristics of sand and significances of seismic lithology: a case study of Shan-2 member in Ordos Basin 煤层对砂体地震反射特征的影响及地震岩性意义——以鄂尔多斯盆地山二段为例

Q2 Earth and Planetary Sciences

石油地球物理勘探

Pub Date : 2015-02-15 DOI: 10.13810/J.CNKI.ISSN.1000-7210.2015.01.021

Shenghua Lai, Quansheng Liang, H. Zeng, Pengfei Li

引用次数: 1

Nonlinear inversion based on Metropolis sampling algorithm 基于Metropolis采样算法的非线性反演

Q2 Earth and Planetary Sciences

石油地球物理勘探

Pub Date : 2015-01-01 DOI: 10.13810/J.CNKI.ISSN.1000-7210.2015.01.017

Baoli Wang, R. Sun, Xingyao Yin, Guangzhi Zhang

Nonlinear inversion based on Metropolis sampling algorithm is formulated in the Bayesian framework. As one kind of Monte Carl non-linear inversions, it can effectively integrate high frequency information of well logging data, and obtain inversion results with a higher resolution. Firstly, we get the priori information through fast Fourier transform moving average (FFT-MA) and gradual deformation method (GDM). Second, we structure likelihood function. Then we apply Metropolis algorithm in order to obtain an exhaustive characterization of the posteriori probability density. FFT-MA is a kind of efficient simulation method. Combined with GDM, it can constantly modify reservoir model and keep the spatial structure unchanged until it matches the observed seismic data. According to the model trial and real data processing, we can conclude that nonlinear inversion based on Metropolis sampling algorithm provide reasonable elastic parameter information, especially it improves the resolution of P-wave velocity. Even when the signal noise ratio (SNR) is relatively low, it can still show reasonable elastic parameter information, which proves the effectiveness of the proposed method. The inversion resolution of P-wave and S-wave impedances is higher than elastic parameters inversion if we do not consider the noise. ©, 2015, Science Press. All right reserved.

在贝叶斯框架下，提出了基于Metropolis采样算法的非线性反演方法。作为蒙特卡罗非线性反演的一种，它可以有效地整合测井资料的高频信息，获得更高分辨率的反演结果。首先，通过快速傅里叶变换移动平均法(FFT-MA)和渐进变形法(GDM)获得先验信息;其次，构造似然函数。然后应用Metropolis算法得到后验概率密度的详尽表征。FFT-MA是一种高效的仿真方法。与GDM相结合，可以不断修正储层模型，保持储层空间结构不变，直至与地震观测资料相匹配。通过模型试验和实际数据处理，得出Metropolis采样算法的非线性反演提供了合理的弹性参数信息，特别是提高了纵波速度的分辨率。即使在信噪比较低的情况下，仍能显示出合理的弹性参数信息，证明了所提方法的有效性。在不考虑噪声的情况下，纵波和横波阻抗反演的分辨率要高于弹性参数反演。©，2015，科学出版社。版权所有。

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引用次数: 0

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