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Abstract

Summary

The variability of minerals’ elastic moduli for non-clay and clay volume fractions of shaley sands is overlooked in the literature. This has implication in proper use of Gassmann fluid substitution model in sandstones. Here, I argue that the elastic moduli of the dry frame at zero porosity is not equivalent to effective elastic moduli of the rock aggregate and the latter should not be used as the effective minerals’ elastic moduli in Gassmann model. A calibration algorithm is proposed here to address this challenge by assessing several combinations of elastic moduli of the solid minerals (sand and wet-clay) through fitting the wireline log velocities. While there is a wealth of literature on the effects of clay on velocities, the treatment of clay content in the dry rock models is discussed to a lesser extent. The proposed method, also addresses this challenge by extending the application of the existing dry-rock models to sand-shale mixtures. This allows us to devise an explicit relation between dry-frame elastic moduli and effective porosity and clay content. Such model is necessary for simulator-to-seismic modelling studies where the reservoir model include reservoir and non-reservoir lithologies with a variable porosity and clay content.

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/content/papers/10.3997/2214-4609.201801019
2018-06-11
2024-04-23

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201801019
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Calibration of Minerals’ and Dry Rock Elastic Moduli in Sand-Shale Mixtures
Conference Proceedings 2018, 1 (2018); https://doi.org/10.3997/2214-4609.201801019
/content/papers/10.3997/2214-4609.201801019
/content/papers/10.3997/2214-4609.201801019
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