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Digital Rock Physics Based Pore Type Effect Analysis on Acoustic Properties of Carbonate Rocks
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 80th EAGE Conference and Exhibition 2018, Jun 2018, Volume 2018, p.1 - 5
Abstract
In this paper, we first subsample numerous datasets from digital rock model, and then the subvolumes were used to simulate the elastic properties with FEM solver. We verified the FEM results through ultrasonic measurements, and presented the cross-plot of acoustic velocity versus porosity. Regardless of the pore shape, Vp-φ crosspiot showed chaotic and scatter. Based on 3D porous structure of each subvolume, we classified such data points into several groups by different pore type. We found that for a certain porosity, pore type greatly affects the acoustic velocities of carbonate rocks. For an instance, we can observe that the acoustic velocities of carbonate rocks with moldic pores are much higher than the ones of carbonate rocks with dissolved intercrystalline pores. Carbonate rocks with compliant pores, let’s say fracture or microcrack, exhibit the lowest acoustic velocity compared with the ones with stiffer pores like moldic pores. Through the classification approach in terms of pore type, one can obtain better correlations between acoustic velocity and porosity concerning with different pore-type carbonate. This probably enables us to gain profound insights into carbonate reservoir prediction based on reservoir inversion with digital rock physics knowledge.