Uncertainty Quantification of Two-term Relative Elastic Inversion

Ball, Vaughn; Blangy, J. P.; Thomas, Michelle; Schiøtt, Christian Rau

doi:10.3997/2214-4609.20147465

Cited by 6 publications

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“…See Downton and Lines (2004). For a general discussion of 2T truncation when prior rock-physics information is considered, see Ball et al (2014). 5) Within group 2, there are some equations where the first two properties are of the form Xρ, where X is an arbitrary elastic property.…”

Section: Discussionmentioning

confidence: 99%

Rock-physics relationships between inverted elastic reflectivities

2016

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Quantitative relationships between true elastic properties are not always applicable to inverted elastic properties. We use the important example of two-term AVO reflectivity inversion to demonstrate this. AVO literature includes many examples of two-term AVO equations, and we provide a general relationship to convert between inverted reflectivities obtained when using these various equations. Conversion between inverted reflectivities should be based on this equation, rather than standard elastic-property relationships. This is of immediate importance when applying the method of chi-angle projections to estimate elastic reflectivities.

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Section: Discussionmentioning

confidence: 99%

Rock-physics relationships between inverted elastic reflectivities

2016

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Chapter 10: Prestack Impedance Inversion

2024

Essentials of Seismic Attributes and Impedance Inversion

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Application of extended elastic impedance in seismic geomechanics

et al. 2019

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We have evaluated an innovative application of extended elastic impedance (EEI) to integrate seismic and geomechanics for geomechanical interpretation of hydrocarbon reservoirs. EEI analysis is used to extract geomechanical parameters. To verify and assess the capabilities of EEI analysis for extracting geomechanical parameters, we selected a jointed, oil-bearing, shale carbonate reservoir in the southwest of Iran, and we used petrophysical data and core analysis to estimate static and dynamic moduli of the reservoir rock. We calculated the corresponding EEI curve to different intercept-gradient coordinate rotation angles (the chi angle, [Formula: see text]), and we selected the angles of the maximum correlation for the corresponding geomechanical parameters. Then, combining the intercept and gradient, we generated 3D reflectivity patterns of EEI at different angles. To obtain a cube of geomechanical parameters, we performed model-based inversion on the EEI reflectivity pattern. A comparison between the modeling results and well data indicated that the geomechanical parameters estimated by our method were well-correlated to the observed data. Accordingly, we extracted the geomechanical and rock-physical parameters from the EEI cube. We further found that EEI analysis was capable of giving a 3D mechanical earth model of the reservoir with the appropriate accuracy. Finally, we verified the proposed methodology on a blind well and compared the results with those of the simultaneous inversion, indicating comparable levels of accuracy. Therefore, application of this method in seismic geomechanics can bring about significant progress in the future.

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Uncertainty Quantification of Two-term Relative Elastic Inversion

Cited by 6 publications

References 0 publications

Rock-physics relationships between inverted elastic reflectivities

Rock-physics relationships between inverted elastic reflectivities

Chapter 10: Prestack Impedance Inversion

Application of extended elastic impedance in seismic geomechanics

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