SEG Technical Program Expanded Abstracts 2012 2012
DOI: 10.1190/segam2012-1106.1 View full text |Buy / Rent full text
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Abstract: We have measured velocity anisotropy on 13 core samples from an organic shale oil reservoir with differential pressure up to 3000 psi. The pressure effect on velocities is generally stronger in direction normal to the bedding than along the bedding, and thus the anisotropy decreases with increasing differential pressure. P-wave anisotropy and vertical Vp/Vs ratio have good correlation with TOC content: the higher is the TOC content, the stronger is Pwave anisotropy and the lower is Vp/Vs ratio. The measured P-… Show more

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“…where VPθ is the phase velocity. As Yan, Han, and Yao () pointed out, this small angle error can have significant effect on estimation of c 13 and δ. In Fig.…”
Section: Uncertainty In Laboratory Velocity Anisotropy Measurementmentioning
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“…where VPθ is the phase velocity. As Yan, Han, and Yao () pointed out, this small angle error can have significant effect on estimation of c 13 and δ. In Fig.…”
Section: Uncertainty In Laboratory Velocity Anisotropy Measurementmentioning
“…The angle error does not cause significant difference in the estimation of δ for this sample, but as shown by Yan et al (2012), a 5°angle error can cause greater error in c 13 and δ in some cases. V P90°i s not shifted because it is measured on the axial direction of the horizontal plug.…”
Section: A N G L E E R R O R D E T E C T I O Nmentioning
“…Yan, Han and Yao (2012) showed that 1% error in estimating of 45°P-wave phase velocity can cause significant error in estimating c 13 and δ. For this sample, the scalar difference between the 45°group velocity and the 45°phase velocity is about 6%.…”
Section: G R O U P V E L O C I T Y a N D P H A S E V E L O C I T Y M mentioning
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