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Anisotropy Parameters δ, ε and γ of Fractured Media with Different Type of Fracture Infill
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First EAGE Rock Physics Workshop in Latin America, Dec 2021, Volume 2021, p.1 - 6
Abstract
Summary
We study Thomsen parameters δ, ε and γ of fractured reservoirs. Using the Linear Slip model, we discover the properties of 8 and its relationship with ε and y. We derive an analytical formula for δ, from which we found out different nature of the interconnection of δ, ε and γ in the model with empty dry cracks compared to the model with the cracks completely filled either with a solid or liquid substance. We successfully validate our theoretical research on published data of physical modeling.
In a model with dry (empty) fractures, δ tends to ε, and γ turns out to be much less than ε (following our theory, γ tends to one third of ε). The data of experiments are also in excellent agreement with our theory for models with filled cracks. Two physical models with different crack filler are considered: one is the cracks saturated with a liquid fluid (honey), and the other is the cracks filled with a "weak" solid (rubber). In both of these models, γ turns out to be significantly larger than ε (following our theory y>4/3 ε), and δ turns out to be negative.
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