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Abstract

Summary

The pore structure of reservoir sandstones has significant influence on their elastic properties, and also determines the fluid-flow related wave dispersion and attenuation mechanisms. In the squirt fluid models, only the compliant pore or crack with fixed aspect ratio and concentration has been taken into account, and the fixed aspect ratio must be considered as the “average” one in the rock, which is not completely realistic. Based on an iterative procedure to add soft pore with different aspect ratio into the rock frame, the existing squirt fluid model was extended to consider complex pore structure of reservoir sandstones, especially when the aspect ratio has a relatively wide distribution. The new method can predict well the saturated velocities for experimental data at ultrasonic frequency by using the pore aspect ratio distribution. The calculated velocity gradually increases with frequency and finally approaches the high-frequency velocity limit. This observation suggests that the squirt flow may be still important even in the seismic frequency band, and can cause apparent velocity deviation from the predictions based on Gassmann’s equation.

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/content/papers/10.3997/2214-4609.201414398
2015-11-15
2024-04-25

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http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201414398
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The Influence of Pore Structure on the Velocity Dispersion Properties of the Tight-gas Sandstone
Conference Proceedings 2015, 1 (2015); https://doi.org/10.3997/2214-4609.201414398
/content/papers/10.3997/2214-4609.201414398
/content/papers/10.3997/2214-4609.201414398
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