A stable inversion of effective fluid bulk modulus

被引：0
|
作者：
Liu X. [1 ]
Yin X. [2 ]
Zong Z. [2 ]
Cui W. [3 ]
机构：
[1] Exploration Branch Co., SINOPEC, Chengdu, 610041, Sichuan
[2] School of Geosciences, China University of Petroleum, Qingdao, 266580, Shandong
[3] CNOOC Research Institute, Beijing
来源：
Liu, Xiaojing (xiaojingliu.1122@gmail.com) | 1600年 / Science Press卷 / 51期
关键词：
Effective fluid bulk modulus; Elastic impedance; Porosity inversion; Stable inversion;
D O I：
10.13810/j.cnki.issn.1000-7210.2016.06.016
中图分类号：
学科分类号：
摘要：
Combining the reflection coefficient approximation in terms of effective fluid bulk modulus proposed by Yin with the idea of elastic impedance equation published by Connolly, this paper derives a novel elastic impedance equation based on effective fluid bulk modulus. The novel elastic impedance is normalized, and then the elastic impedance has the same dimension as P-wave impedance. However, weighting coefficients of inversion parameters are linearly dependent, so it is difficult to stably estimate effective fluid bulk modulus. This study aims at stabilizing the inversion implementation. First the elastic impedance inversion is implemented under the Bayesian framework, and the elastic impedance inverted results are used to estimate the porosity information through Bayesian classifier methods. Then we combine the elastic impedances with inverted porosity to extract effective fluid bulk modulus. As the estimated porosity is set as a priori, the coefficients of the parameters became linearly independent, and the required number of angle-stack seismic data becomes 3 rather than 4. Therefore the effective fluid bulk modulus inversion is stable and reliable. Model tests and practical application verify the effectiveness of the proposed method. © 2016, Editorial Department OIL GEOPHYSICAL PROSPECTING. All right reserved.
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页码：1164 / 1170
页数：6
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