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Simulation of Elastic Properties Using a Proposed Model for Gas Shales
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, First EAGE Rock Physics Workshop in Latin America, Dec 2021, Volume 2021, p.1 - 5
Abstract
We proposed a rock physics model for Gas Shale reservoirs which consider the microgeometry of the rock constituents and omit a preferred host. This model consists of solids components such as calcite, quartz, illite and kerogen (insoluble organic matter), and pores which contain water and/or gas. Pore systems are classified into intergranular pores, microcavities, and pores of organic matter. The organic matter constituent contains kerogen and pores, and its shape can vary. We apply the Effective Medium Approximation (EMA) method to compute the bulk (K) and shear (μ) effective moduli from proposed model. This method allows consider multiple phases that can be interconnected, granular materials might be well represented, and a preferred background is not required. Consequently, E (Young) modulus, ν (Poisson’ ratio), λ (Lamé constant), Vp (compressional velocity), Vs (shear velocity), and Vp/Vs ratio as well as the indicators E/ν and E/λ were obtain from effective K and μ. We apply the Newton-Raphson method to solve the EMA equations. We applied a modelling using a synthetic case study proposed to analyse how the elastic properties depend on the concentration but also of the shape of the constituent and its effect over Vp/Vs, E/ν and E/λ ratios.