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Acoustic anisotropy in rock formation

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Proceedings Papers

Paper presented at the SPE/AAPG/SEG Asia Pacific Unconventional Resources Technology Conference, November 16–18, 2021
Paper Number: URTEC-208277-MS
...Abstract Abstract Knowledge of in-situ stress orientation and magnitude is important for calibration of geomechanical models in low permeability reservoirs and bounding formations. The analysis of azimuthal anisotropy from cross-dipole acoustic data and study of drilling induced wellbore...
Proceedings Papers

Paper presented at the SPWLA 61st Annual Logging Symposium, June 24–July 29, 2020
Paper Number: SPWLA-5098
... and to help locating the best zones to fracture. Monopole, in-line dipole and cross-line dipole acoustic data are used in the analyses. The analyses include basic slowness, dynamic rock mechanical properties, azimuthal anisotropy, Stoneley permeability, geomechanics and Deep Shear Wave Image. The results...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-1876
... new insights in geomechanics applications and fracture identification. Current borehole acoustic tools can detect the azimuthal and transverse shear wave intrinsic rock anisotropy. They also help identify stress-sensitive formations and help in the evaluation of natural fractures, those that intersect...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, July 22–24, 2019
Paper Number: URTEC-2019-893-MS
... errors of Young s modulus caused by treating the OB rock as a TI rock in different shale formations. In general, the Young's modulus magnitude will be overestimated when treating an OB rock as a TI medium by ignoring the natural fracture induced anisotropy in acoustic log interpretation. As SWS increases...
Proceedings Papers

Paper presented at the 46th U.S. Rock Mechanics/Geomechanics Symposium, June 24–27, 2012
Paper Number: ARMA-2012-644
... as a function of the stiffness tensor components and the relationship between the orthotropic elastic pro stiffness tensor. Currently, cross-dipole multi-array acoustic logs are available to measure shear wave anisotropy in rocks from vertical wells. The azimuthally polarized vertical shear wave anisotropy can...
Proceedings Papers

Paper presented at the SPE Asia Pacific Oil & Gas Conference and Exhibition, November 17–19, 2020
Paper Number: SPE-202260-MS
... applicable in formations that are clean (low shale content), are acoustically stress sensitive, have > 1.5% shear anisotropy and have borehole ovality < 5%. This technique is not applicable to determine stress in shales as we would need to know the anisotropic elastic properties without stress to do...
Proceedings Papers

Paper presented at the SPE Heavy and Extra Heavy Oil Conference: Latin America, September 24–26, 2014
Paper Number: SPE-171123-MS
... degree of anisotropy; source of anisotropy in different rock types, are related to rock intrinsic effects such as aligned fractures, layering of high laminated zones or stress variations, within the formation. ( Boyd et al., 1995 ). Acoustic logs use a particular principle of measurement; two...
Proceedings Papers

Paper presented at the SPE/AAPG/SEG Unconventional Resources Technology Conference, July 20–22, 2020
Paper Number: URTEC-2020-2667-MS
... in formation characterization, they offer an important link to seismic data (1-100 Hz). Acoustic impedance and Vp/Vs ratios are used to identify fluid types in the formation (Gassmann, 1951). In unconventional rocks it often correlates with organic richness (TOC). In unconventional rocks, these measurements...
Proceedings Papers

Paper presented at the SPE Offshore Europe Oil and Gas Conference and Exhibition, September 3–6, 2013
Paper Number: SPE-166547-MS
.... To measure hydraulic fracture height at the wellbore, shear wave anisotropy data were acquired in casing with an advanced acoustic tool. Hydraulic fracturing post-job pressure matching also provided estimates of fracture geometry. Shear wave anisotropy data confirmed that the Thebes and Rudeis formations...
Proceedings Papers

Paper presented at the 2010 SEG Annual Meeting, October 17–22, 2010
Paper Number: SEG-2010-0563
... reduced mechanical rigidity than the original undamaged formation. Understanding the effect of this type of fractures on the acoustic dipole responses not only is important for correctly interpreting the acoustic anisotropy measurement but also will help characterizing the fractures using acoustic logging...
Proceedings Papers

Paper presented at the SPWLA 2nd Asia Pacific Technical Symposium, November 7–8, 2018
Paper Number: SPWLA-2018-1817
... poro-elastic horizontal strain model. Realistic stress characterization will help in mitigating well-bore stability issues, cap-rock integrity study, completion design, sand production prediction etc. A unique amalgamation of advanced acoustic, image and formation testing workflows has been...
Proceedings Papers

Paper presented at the ISRM Conference on Rock Mechanics for Natural Resources and Infrastructure - SBMR 2014, September 9–13, 2014
Paper Number: ISRM-SBMR-2014-004
... of the rock in the Campamento 1 Field, the cross-dipole shear and Stoneley-derived horizontal shear (DTSH) are processed to define the anisotropy of the rock formation. SBMR 2014 Acoustic anisotropy measurements in a rock exhibiting transverse isotropy with a vertical axis of symmetry (VTI) show...
Proceedings Papers

Paper presented at the SPE Middle East Oil & Gas Show and Conference, November 28–December 1, 2021
Paper Number: SPE-204653-MS
... of the host rock, the normal and tangential fracture-compliance parameters. Input for the fracture properties are provided from the interpretation of image logs. Formation slownesses and Fast Shear Azimuth (FSA) comes from acoustic anisotropy analysis. The Fast Shear Azimuth (FSA) represents the direction...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 11–14, 2019
Paper Number: SPE-197135-MS
... contrast within the organic rich X Formation. The azimuthal and transverse acoustic anisotropies were obtained from X-dipole data to fully characterize the elastic properties of the formation. The static elastic properties were obtained using empirical core correlations as triaxial core tests were...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 11–14, 2019
Paper Number: SPE-197666-MS
...) are indicative of borehole failure or alteration, stress induces effects and also to some extent bears the characteristic of fractured formation. Dispersion analysis of shear waveforms has been analyzed to characterized acoustic anisotropy in several zones. Figures 9 , 10 and 11 displayed the example...
Proceedings Papers

Paper presented at the SPWLA 40th Annual Logging Symposium, May 30–June 3, 1999
Paper Number: SPWLA-1999-QQ
... of the model theory for in-situ stress estimation from borehole acoustic monopole and cross-dipole data. In particular, the theory uses the cross- dipole anisotropy measurement results to give an indicator relating to formation shear stress and rock deformation, which may be a useful tool for sand control...
Proceedings Papers

Paper presented at the SPWLA 50th Annual Logging Symposium, June 21–24, 2009
Paper Number: SPWLA-2009-21660
... acoustic logging to characterize the formation azimuthal anisotropy. In these measurements, acoustic transmitters and receivers are placed along the borehole to transmit and acquire flexural waves with orthogonal polarizations. These flexural waves propagate at different phase velocities if the formation...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition and Conference, November 5–8, 2006
Paper Number: SPE-101477-MS
... rock and overburden formations up to surface was carried out in eighteen wells. Important rock properties derived from this study were linked to seismic data and VSP information. The key attributes that were obtained from the processing of the acoustic data were Shear Anisotropy, Vp/Vs ratio and Uni...
Proceedings Papers

Paper presented at the SPWLA 2nd Asia Pacific Technical Symposium, November 7–8, 2018
Paper Number: SPWLA-2018-1833
... in-situ properties showed anisotropy due to layering which is known as transverse isotropic vertical (TIV) anisotropy. Thus, a new advance acoustic workflow has been adopted to incorporate the TIV anisotropy for wellbore stability for this analysis. In this type of anisotropic formations, Rock mechanical...
Proceedings Papers

Paper presented at the 2018 SEG International Exposition and Annual Meeting, October 14–19, 2018
Paper Number: SEG-2018-2972006
... of cracks with different orientations. The theory is applied to interpret acoustic anisotropy measurements acquired in hydraulically fractured formations. Theory and measurements are in good agreement. Presentation Date: Thursday, October 18, 2018 Start Time: 8:30:00 AM Location: 205A (Anaheim Convention...

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