scholarly journals Acoustic Velocity and Attenuation in Porous Rocks

2013 ◽  
pp. 20-34 ◽  
Author(s):  
Kenneth W. Winkler ◽  
William F. Murphy
Keyword(s):  
Acoustic Velocity ◽  
Porous Rocks

SHALLOW STRATIGRAPHIC SEQUENCES AND THEIR ACOUSTIC VELOCITY IN THE BOHAI STRAIT AND SURROUNDING AREAS

2012 ◽  
Vol 32 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Xiaohui CHEN ◽  
Xunhua ZHANG ◽  
Tiegang LI ◽  
Rihui LI ◽  
Zhongbo WANG
Keyword(s):  
Acoustic Velocity ◽  
Surrounding Areas ◽  
Stratigraphic Sequences ◽  
Bohai Strait

scholarly journals Use of Image Correlation to Measure Macroscopic Strains by Hygric Swelling in Sandstone Rocks

2021 ◽  
Vol 11 (6) ◽  
pp. 2495
Author(s):  
Belén Ferrer ◽  
María-Baralida Tomás ◽  
David Mas
Keyword(s):  
Cross Correlation ◽  
Pore Space ◽  
Digital Camera ◽  
Experimental Methods ◽  
Image Correlation ◽  
Rock Surface ◽  
Experimental Setup ◽  
Porous Rocks ◽  
Porous Sandstone ◽  
Variable Displacement

Some materials undergo hygric expansion when soaked. In porous rocks, this effect is enhanced by the pore space, because it allows water to reach every part of its volume and to hydrate most swelling parts. In the vicinity, this enlargement has negative structural consequences as adjacent elements support some compressions or displacements. In this work, we propose a normalized cross-correlation between rock surface texture images to determine the hygric expansion of such materials. We used small porous sandstone samples (11 × 11 × 30 mm3) to measure hygric swelling. The experimental setup comprised an industrial digital camera and a telecentric objective. We took one image every 5 min for 3 h to characterize the whole swelling process. An error analysis of both the mathematical and experimental methods was performed. The results showed that the proposed methodology provided, despite some limitations, reliable hygric swelling information by a non-contact methodology with an accuracy of 1 micron and permitted the deformation in both the vertical and horizontal directions to be explored, which is an advantage over traditional linear variable displacement transformers.

3D constrained inversion of CSEM data with acoustic velocity using full waveform inversion

2012 ◽  
Author(s):  
Nuno Vieira da Silva ◽  
Joanna Morgan ◽  
Mike Warner ◽  
Adrian Umpleby ◽  
Ivan Stekl
Keyword(s):  
Waveform Inversion ◽  
Acoustic Velocity ◽  
Full Waveform Inversion ◽  
Full Waveform
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