Density extraction from P-wave AVO inversion: Tuscaloosa Trend example

Behura, Jyoti; Kabir, Nurul; Crider, Richard; Jílek, Petr; Lake, Ellen

doi:10.1190/1.3462777

Cited by 25 publications

(3 citation statements)

References 8 publications

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“…Estimation of the density through seismic inversion has been considered difficult and is dependent on the appropriate angle stacks to get a meaningful result. However some encouraging results have been reported for density estimation where density contrast is the dominant contributor for lithology or fluid discrimination (Behura et al, 2010, Kabir et al, 2006). An estimation of density through simultaneous inversion may be useful in this case if far angle volumes greater than 30 degrees are available.…”

Section: Resultsmentioning

confidence: 99%

Rock physics analysis: a tool for lithology and fluid prediction in the Gulf of Thailand

Ahmad

Rowell

2013

ASEG Extended Abstracts

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Section: Resultsmentioning

confidence: 99%

Rock physics analysis: a tool for lithology and fluid prediction in the Gulf of Thailand

Ahmad

Rowell

2013

ASEG Extended Abstracts

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“…In general, Young's modulus and Poisson's ratio are calculated indirectly from P wave, S wave, and density data and directly from pre-stack inversion. However, density data is difficult to be estimated and the results are usually unreliable (Downton, 2005;Behura et al, 2010). In addition, the above indirect calculation method may lead to accumulative error.…”

Section: Introductionmentioning

confidence: 99%

Direct pre-stack inversion of elastic modulus using the exact Zoeppritz equation and the application in shale reservoir

Song

Ding

et al. 2023

Front. Earth Sci.

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Young’s modulus and Poisson’s ratio are important for reservoir characterization and rock brittleness prediction in unconventional resource exploration and development. Conventional methods can estimate Young’s modulus and Poisson’s ratio by indirect calculations and direct inversion using approximate expressions, which have cumulative errors and limited accuracy of the estimated results, especially at large incident angles. In this study, we derived a new form of the Zoeppritz equation and P-to-P wave reflection coefficient in terms of density and Young’s modulus, Poisson’s ratio. It has the same accuracy as the original Zoeppritz equation over a wide range of incident angles. A robust non-linear inversion method based on the iteratively regularized Levenberg Marquardt (IRLM) algorithm, is used to invert all three parameters based on the new equation directly and simultaneously. Synthetic data and field data are used to test and verify the proposed direct inversion method, ensuring the feasibility and effectiveness of the proposed method and the high accuracy and stability of the inversion results. This study has a great potential and valuable guidance for “sweet spot” evaluation and subsequent horizontal well deployment and hydraulic fracturing.

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“…However, seismic reflection events at large offsets are often seriously distorted and need to be conditioned carefully due to normal moveout (NMO) stretching and tuning effects (Zhang et al 2012). For the very rare situations when density contrast is a dominant contributor to the reflection coefficient, density may be estimated from near and far offsets (Behura et al 2010). For the majority of cases, density inversion using field data is extremely ill-posed, as the data contain noise and the results will be unstable (Downton et al 2001;Downton and Lines 2004;Alemie and Sacchi 2011).…”

Section: Introductionmentioning

confidence: 99%

Pre-stack seismic density inversion in marine shale reservoirs in the southern Jiaoshiba area, Sichuan Basin, China

et al. 2018

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For a typical marine shale reservoir in the Jiaoshiba area, Sichuan Basin of China, P-impedance is sensitive for identifying lithology but not suitable for indicating good shale reservoirs. In comparison, density is an important quantity, which is sensitive for identifying the organic-rich mud shale from non-organic-rich mud shale. Due to the poor data quality and incidence angle range, density cannot be easily inverted by directly solving the ill-posed pre-stack seismic inversion in this area. Meanwhile, the traditional density regularizations implemented by directly using the more robust P-impedance inversion tend to be inaccurate for recovering density for this shale reservoir. In this paper, we combine the P-impedance and the minus uranium to construct the pseudo-P-impedance (PIp) at well locations. The PIp is observed to be sensitive for identifying organic-rich mud shale and has a good correlation with density in this area. We employ the PIp-density relation into the pre-stack inversion framework to estimate density. Three types of regularization are tested on both numerical and field data: These are no regularization, traditional regularization and the proposed approach. It is observed that the proposed method is better for recovering the density of organic-rich mud shale in the Jiaoshiba area.

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Density extraction from P-wave AVO inversion: Tuscaloosa Trend example

Abstract: Density extraction from amplitude-variation-with-offset (AVO) inversion is thought to be unstable and difficult. Recent research has, however, shown that it is possible to reliably extract density from P-wave reflection data if the interface has significant contrast.

Cited by 25 publications

References 8 publications

Rock physics analysis: a tool for lithology and fluid prediction in the Gulf of Thailand

Rock physics analysis: a tool for lithology and fluid prediction in the Gulf of Thailand

Direct pre-stack inversion of elastic modulus using the exact Zoeppritz equation and the application in shale reservoir

Pre-stack seismic density inversion in marine shale reservoirs in the southern Jiaoshiba area, Sichuan Basin, China

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