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Anisotropy

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Proceedings Papers

Paper presented at the SPWLA 58th Annual Logging Symposium, June 17–21, 2017
Paper Number: SPWLA-2017-H
... contradiction became known as the "paradox of anisotropy", and in 1932, it was mathematically proven for the limit of negligibly small boreholes. The original proof was long and difficult; Coulomb's law in generally anisotropic media offers a much simpler proof. In such horizontally laminated formations...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, August 1–3, 2016
Paper Number: URTEC-2459699-MS
... Summary The permeability anisotropy is related to the electric resistivity anisotropy and the pore throat cross-section anisotropy as, (equation), where the subscript H and V indicate the conduction in the horizontal and vertical direction, respectively. R H and R V...
Proceedings Papers

Paper presented at the 2014 SEG Annual Meeting, October 26–31, 2014
Paper Number: SEG-2014-0114
... Summary As shales are usually anisotropic, models that neglect this anisotropy may lead to incorrect estimates of rock and fluid properties derived from inversion of seismic amplitude versus offset (AVO) data. Such models may also fail to describe geomechanical behavior correctly...
Proceedings Papers

Paper presented at the SPE Saudi Arabia Section Technical Symposium and Exhibition, April 21–24, 2014
Paper Number: SPE-172202-MS
... or organic, are known to be anisotropic, in particular. The layer anisotropy affects the tool responses and hence, ignoring the layer anisotropy may result in wrong estimates for the D2B and resistivity determination from the tool responses. These estimates may have to be corrected for anisotropy...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-0761
... Abstract The studied Gas Shale especially the silica-rich gas-shale samples displayed permeability and elasticity anisotropy behavior. These anisotropy behaviors are closely correlated in terms of the symmetry directions which means the elastic anisotropy and permeability anisotropy share...
Proceedings Papers

Paper presented at the 2013 SEG Annual Meeting, September 22–27, 2013
Paper Number: SEG-2013-1349
... Summary Rock strength and elastic properties are primary rock parameters. Many rocks are inherently anisotropic. Knowledge of strength anisotropy and elastic anisotropy has great practical application in stimulation design. Twelve oriented pyrophyllite core plugs were tested to analyze...
Proceedings Papers

Paper presented at the ISRM International Symposium - 6th Asian Rock Mechanics Symposium, October 23–27, 2010
Paper Number: ISRM-ARMS6-2010-032
... SYNOPSIS: Determination of rock strength and its anisotropy is important in rock mechanics and engineering geology investigations. Destructive tests such as measurement of uniaxial compressive strength and/or point load strength index are commonly employed for this purpose. In the present...
Proceedings Papers

Paper presented at the ISRM International Symposium on In-Situ Rock Stress, August 25–27, 2010
Paper Number: ISRM-ISRS-2010-036
... ABSTRACT: The acoustoelasticity method has been developed to estimate the in-situ rock stresses by the measurement of velocity anisotropy around a borehole. The velocity anisotropy around a borehole can be induced by intrinsic anisotropy or the applied stresses of rocks. The practical rocks...
Proceedings Papers

Paper presented at the SPE Oil and Gas India Conference and Exhibition, January 20–22, 2010
Paper Number: SPE-128446-MS
... technology and processing technqiques, the models started incorporating and integrating variations of petrophysical properties with orientation: anisotropy. Anisotropic petrophysical properties include permeability, acoustic slowness, resistivity, etc. Complex models incorporating variations of petrophysical...
Journal Articles
SPE Res Eval & Eng 13 (02): 265–274.
Paper Number: SPE-116129-PA
Published: 13 January 2010
...Ashraf Al-Tahini; Younane Abousleiman Summary In this study, we determine experimentally the effect of inherent and stress-induced anisotropy on stiffness components, elastic moduli, and Biot's pore-pressure coefficients (PPCs) for Lyons outcrop Colorado sandstone, which exhibits a clear transverse...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 21–24, 2008
Paper Number: SPE-116129-MS
... Abstract In this study, we determine experimentally the effect of inherent and stress-induced anisotropy on stiffness components, elastic moduli, and Biot's pore pressure coefficients (PPCs) for Lyons outcrop Colorado sandstone which exhibits a clear transverse isotropic rock structure. Both...
Proceedings Papers

Paper presented at the 2007 SEG Annual Meeting, September 23–28, 2007
Paper Number: SEG-2007-0149
... Introduction Summary We perform an ultrasonic experiment on anisotropy of wave propagation in the model constructed from plexiglas plates, with oil saturation and without any saturation. We determine the directional dependencies of P- and S-waves attenuations and velocities and estimate...
Proceedings Papers

Paper presented at the 2005 SEG Annual Meeting, November 6–11, 2005
Paper Number: SEG-2005-0170
... the elastic constants, we predict S-wave anisotropy. Forward modeling promises good results and we attribute this performance on the number of velocity measurements and the choice of a reference body. We inverted P-wave velocity measurements of the mantle rocks for stiffnesses in the frame work of a vertical...
Proceedings Papers

Paper presented at the DC Rocks 2001, The 38th U.S. Symposium on Rock Mechanics (USRMS), July 7–10, 2001
Paper Number: ARMA-01-0777
... dependency and directionality. In this paper, as an important extension to linear profile analysis, in-plane analysis of roughness is presented. By means of sampling equilateral triangular arrangements of points on a surface it has been found possible to determine anisotropy of surface r6ughness. In addition...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, September 27–30, 1998
Paper Number: SPE-49235-MS
... This paper was prepared for presentation at the 1998 SPE Annual Technical Conference and Exhibition held in New Orleans, Louisiana, 27-30 September 1998. stresschange magnitude permeability anisotropy estimation reservoir characterization permeability flow anisotropy hmin principal...
Proceedings Papers

Paper presented at the SPE/IATMI Asia Pacific Oil & Gas Conference and Exhibition, October 12–14, 2021
Paper Number: SPE-205710-MS
... difficult. This study proposes a new drilling loss prevention idea to evaluate fractured lost circulation risk using seismic and wellbore data by a novel neural network. The approach works in two steps. First, the fracture anisotropy of a lost circulation sample curve is computed and interpreted using well...
Proceedings Papers

Publisher: Society of Petroleum Engineers (SPE)
Paper presented at the SPE Annual Technical Conference and Exhibition, September 21–23, 2021
Paper Number: SPE-206109-MS
... computed through simulation of various physical phenomenon. In this paper, we document a workflow for estimation of tortuosity anisotropy in both whole-core CT-scan and micro-CT-scan image stacks and compare the tortuosity estimates obtained from simulation of electric potential distribution, diffusion...
Proceedings Papers

Publisher: Society of Petroleum Engineers (SPE)
Paper presented at the SPE Annual Technical Conference and Exhibition, September 21–23, 2021
Paper Number: SPE-205912-MS
... and thermal maturation, strongly affect velocity and permeability anisotropies. Note that only oven-dried cores were used in the previous study of Gordin et al. (2020) , where the anisotropy was found to show strong velocity hysteresis during pressurization and depressurization of the confining pressure...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, July 26–28, 2021
Paper Number: URTEC-2021-5339-MS
... Abstract This research attempts to evaluate if anisotropy in fracture clustering translates into anisotropy in terms of flow properties. We considered a fractal-fracture model and data that comprise a set of three fracture maps collected from the Devonian sandstone of Hornelen Basin, Norway...
Proceedings Papers

Paper presented at the 3rd International Discrete Fracture Network Engineering Conference, June 21–25, 2021
Paper Number: ARMA-DFNE-21-2358
... Abstract Anisotropy is often observed in rock masses that contain fractures and affects several properties including flow behavior, which is controlled by how fractures are clustered in space. While Rose diagrams are often used for delineating "fracture sets" in different directions, the role...

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