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The impact of grain characteristics on acoustic logging in unconsolidated sands

Yue Chongwang, Wang Zhuwen, Yang Zhi and Li Yu
The impact of grain characteristics on acoustic logging in unconsolidated sands
Interpretation (Tulsa) (August 2020) 8 (3): SL103-SL111

Abstract

Characterizing acoustic propagation in unconsolidated sand reservoirs is critical in offshore oil and gas exploration. We have simulated the acoustic field in a borehole surrounded by granular media based on nonuniform contact, using a 2nd-order in time and 10th-order in space finite-difference technique. We focus on the impact of the porosity and coordination number, grain size, and grain scale distribution on acoustic logging. Numerical simulation results show that P- and S-wave velocities decrease with increasing the porosity or decreasing the coordination number and increase with increasing the grain size. For different grain size distributed in the vertical and radial directions, the velocity and amplitude of the P-wave and S-wave are different. As reflected waves in a borehole, the arrival wave's velocity is higher and the amplitude is stronger, whereas grains near the source or borehole axis are larger. The results of this paper provide a reference for analyzing and predicting different graded bedding formations for acoustic logging.


ISSN: 2324-8858
EISSN: 2324-8866
Serial Title: Interpretation (Tulsa)
Serial Volume: 8
Serial Issue: 3
Title: The impact of grain characteristics on acoustic logging in unconsolidated sands
Affiliation: Chang'an University, College of Geological Engineering and Surveying, Xi'an, China
Pages: SL103-SL111
Published: 202008
Text Language: English
Publisher: Society of Exploration Geophysicists, Tulsa, OK, United States
References: 26
Accession Number: 2020-051346
Categories: Economic geology, geology of energy sourcesApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Secondary Affiliation: Jilin University, College of Geoexploration Science and Technology, CHN, China
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by Society of Exploration Geophysicists, Tulsa, OK, United States
Update Code: 2020
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