Experimental determination of elastic anisotropy of Berea sandstone, Chicopee shale, and Chelmsford granite

Autor:	M. Nafi Toksöz, Karl B. Coyner, Tien-when Lo
Rok vydání:	1986
Předmět:	Berea sandstone Mineralogy Stiffness Overburden pressure Physics::Geophysics Moduli Geophysics Geochemistry and Petrology Elastic anisotropy medicine medicine.symptom Anisotropy Oil shale Grain orientation Geology
Zdroj:	GEOPHYSICS. 51:164-171
ISSN:	1942-2156 0016-8033
DOI:	10.1190/1.1442029
Popis:	We used the ultrasonic transmission method to measure P-, SH-, and SV-wave velocities for Chelmsford granite, Chicopee shale, and Berea sandstone in different directions up to 1 000 bars confining pressure. The velocity measurements indicate these three rocks are elastically anisotropic. The stiffness constants, dynamic Young’s moduli, dynamic Poisson’s ratios, and dynamic bulk moduli of the three rocks were also calculated. The elastic constants, together with velocity measurements, suggest that: (1) elastic anisotropy is due to the combined effects of pores or cracks and mineral grain orientation, and (2) elastic anisotropy decreases with increasing confining pressure. The residual anisotropy at higher confining pressure is due to mineral grain orientation.
Databáze:	OpenAIRE
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