A New Anelasticity Model for Wave Propagation in Partially Saturated Rocks

Chunfang Wu, Jing Ba, Xiaoqin Zhong, José M. Carcione, Lin Zhang and Chuantong Ruan
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Chunfang Wu: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
Jing Ba: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
Xiaoqin Zhong: Exploration and Development Research Institute of PetroChina Changqing Oilfield Company, Xi’an 710018, China
José M. Carcione: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
Lin Zhang: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
Chuantong Ruan: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

Energies, 2021, vol. 14, issue 22, 1-18

Abstract: Elastic wave propagation in partially saturated reservoir rocks induces fluid flow in multi-scale pore spaces, leading to wave anelasticity (velocity dispersion and attenuation). The propagation characteristics cannot be described by a single-scale flow-induced dissipation mechanism. To overcome this problem, we combine the White patchy-saturation theory and the squirt flow model to obtain a new anelasticity theory for wave propagation. We consider a tight sandstone Qingyang area, Ordos Basin, and perform ultrasonic measurements at partial saturation and different confining pressures, where the rock properties are obtained at full-gas saturation. The comparison between the experimental data and the theoretical results yields a fairly good agreement, indicating the efficacy of the new theory.

Keywords: partial saturation; patchy saturation; squirt flow; P-wave velocity dispersion and attenuation; anelasticity; ultrasonic measurements (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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