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- Title
Modeling of Compaction Trends of Anisotropic Elastic Properties of Shales.
- Authors
Yurikov, Alexey; Pervukhina, Marina; Beloborodov, Roman; Delle Piane, Claudio; Dewhurst, David N.; Lebedev, Maxim
- Abstract
Modeling of anisotropic elastic moduli of shales is a long‐standing problem in rock physics. Every year, industry and academia conduct hundreds of measurements of elastic and geomechanical properties of shales complemented with detailed mineralogical analysis, electron microscopy, and microtomographic images. However, a predictive theoretical model, which would be able to predict elastic properties of shale based on its detailed characterization, is still lacking. This is due to the complex multicomponent nature of shales which leads to multiparametric character of the modeling. It is extremely challenging to separate and investigate effects of these multiple parameters individually on natural shale samples. In this work, we analyze a unique data set of elastic properties measured on two artificial shales compacted with carefully controlled mineralogy, microstructure, and porosity. We developed a new modeling approach that consists of four steps that take into account effects of (1) the orientation of clay particles, (2) porosity, (3) silt fraction, and (4) the stiffness of contacts between clay particles. Three of these four steps require only measurable parameters and, only at the final step, the effect of unknown parameters (namely, contact properties of clay platelets) are accounted for. Further, the obtained contact properties are shown to be in a good agreement with the contact properties estimated for natural shale samples. Finally, we demonstrate the effect of each of these identified parameters on elastic coefficients and Thomsen's anisotropic parameters. Key Points: The new model allows separating effects of measurable and fitting parameters affecting elastic properties and anisotropy of compacted shalesAnisotropic parameters epsilon and delta can be estimated from the variation of the orientation of particles during compactionVariations of contact properties between kaolinite clay particles are estimated for compaction stages from 50% to <20% of wet clay porosity
- Subjects
COMPACTING; ANISOTROPY; POROSITY; KAOLINITE; ELECTRON microscopy
- Publication
Journal of Geophysical Research. Solid Earth, 2021, Vol 126, Issue 1, p1
- ISSN
2169-9313
- Publication type
Article
- DOI
10.1029/2020JB019725