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Rayleigh wave and well head response to calculate porosity in the edwards aquifer of South-Central Texas, USA [Uporaba rayleighjevih valov in odziva vodostajev v vodnjakih za izračun poroznosti kamnine v edwardsovem vodonosniku, južni in Osrednji Teksas, ZDA]

Li, G.; Zhang, Y.; Schindel, G. M.; Field, M. S.; Goldscheider, Nico

Abstract:
We use the magnitude and centroid period of Rayleigh wave along with the amplitude of fluctuations of water level in a well to calculate effective porosity of a karst aquifer at the site scale. The radial and vertical displacements of Rayleigh wave are first related to the confining pressure of rock, which is then related to fluid pressure via the Gassmann equation. Three seismograms recorded at station 633A of the USARRAY and the induced responses of Well J-17 in the Edwards Aquifer (Texas) allow the calculation of an effective porosity between 17.0 and 24.4 percent, the average of which is close to the total porosity of core samples determined by geophysical well logs. This paper provides an innovative method to measure effective porosity in aquifers. Because of the long wavelengths of Rayleigh wave, the interdisciplinary approach is advantageous in that the resulting effective porosity is at the site scale which includes large conduits or voids.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129138
Veröffentlicht am 29.01.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0583-6050, 1580-2612
KITopen-ID: 1000129138
Erschienen in Acta carsologica
Band 49
Heft 2-3
Seiten 241-253
Schlagwörter Rayleigh wave, Poisson’s ratio, displacements, well head, Gassmann equation.
Nachgewiesen in Web of Science
Scopus
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