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Transverse isotropy/es

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Proceedings Papers

Paper presented at the 2002 SEG Annual Meeting, October 6–11, 2002
Paper Number: SEG-2002-0388
... Summary We present a series of example of synthetic data with and without random noise to illustrate the effect of transverse isotropy on conventional electric (ES) logs. The first part shows the process of inversion for single tools and how the presence of the borehole changes the sensibility...
Proceedings Papers

Paper presented at the SEG International Exposition and Annual Meeting, October 11–16, 2020
Paper Number: SEG-2020-3427730
... (m ?, u ?, a?) = 0. Variable lifting approach for FWI To mitigate the nonuniqueness issue of optimizing Equation 9, u ? = (S >S ) 1S >d , (16) we need additional information to regularize the problem. The original lifted problem 5 has the constraint of rank(X) = 1. We that satis es the...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 96, September 2–5, 1996
Paper Number: ISRM-EUROCK-1996-114
... proposed. RESUME: On examine une methode analytique de calcule des blindages circulaires des tunnels situes dans Ie massif transversal isotrope, que modele Ie massif vierge anisotrope ou bien dans Ie massif af- falbli par un systerne des fissures hiperiodique. ZUSAMMENFASSUNG: Es wird eine analitische...
Proceedings Papers

Paper presented at the 1st ISRM Congress, September 25–October 1, 1966
Paper Number: ISRM-1CONGRESS-1966-062
... Faktoren werden einander gleich, wenn zwischen den Konstanten Am (m, n = 1, 2, 3) die nach- tragliche Bedingung (20) bestebt. Dann nirnmt die charakteristische Gleichung die Form an: Auch hier wird es aus dem folgenden klar, da(3der letzte Sonderfall mit dem Fall der voIIkommenen Isotropie keineswegs...
Proceedings Papers

Paper presented at the SPWLA 52nd Annual Logging Symposium, May 14–18, 2011
Paper Number: SPWLA-2011-E
... 1, with or without 12-in. mud invasion. Finally, the black curve refers to the log response at the depth of 9,800 ft, which is marked with a red arrow in Figure 5. 5 10 15 20 25 30 35 40 2 4 6 8 10 12 14 16 18 Depth of Investigation (in) Ap pa re nt R es ist ivi ty (o hm *m ) Multi-Laterolog...
Proceedings Papers

Paper presented at the 52nd U.S. Rock Mechanics/Geomechanics Symposium, June 17–20, 2018
Paper Number: ARMA-2018-268
..., and the regime determined by yield stress of Herschel-Bulkley fluid are calculated. The aspect ratio for the toughness-do inated regime is in agreement with the known solution for the dry crack, while for other regi es the aspect ratio is different. 1. INTRODUCTION Unconventional reservoir...
Proceedings Papers

Paper presented at the SPE Middle East Oil Show, March 17–20, 2001
Paper Number: SPE-68193-MS
... s modulus from the stress-strain data (static) along the triaxial compression stress path, as given below: s = 1 - Kb,s / Kma (10) Kb,s = Es / 3(1-2 s) (11) s = - d 3 /d 1 (12) and Es = d 1 /d 1 (13) Where d 1 and d 3 represent stresses in the axial and radial direction, and, d 1 and d 3 represent...
Proceedings Papers

Paper presented at the 1999 SEG Annual Meeting, October 31–November 5, 1999
Paper Number: SEG-1999-0792
... obtained from SH. 5000 10000 15000 0 0.25 0.5 0.75 1 1.25 1.5 Offset ft SV 5000 10000 15000 Offset ft SH 5000 10000 15000 0 0.5 1 1.5 2 2.5 3 40 0 40 0 50 100 ms O cc ur re nc es SP: Pass 1 40 0 40 ms SP: Pass 2 40 0 40 0 200 400 ms O cc ur re nc es RP: Pass 1 Figure 4: Histograms of shotpoint (SP) and...
Proceedings Papers

Paper presented at the 1999 SEG Annual Meeting, October 31–November 5, 1999
Paper Number: SEG-1999-0728
... rectangular recording patch, Si; Ri is es- sentially SV at the far offsets, while Sx; Rx is essentially SH at the far offsets. P-wave energy is apparent on Si; Ri preceding the shear-wave first arrival. Azimuthal rotation to SV-SH coordinates produces the gathers seen in Figure 3. The effect of the azimuthal...
Proceedings Papers

Paper presented at the The Third International Offshore and Polar Engineering Conference, June 6–11, 1993
Paper Number: ISOPE-I-93-184
... major part of the available test data rela~es to in-situ cantilever ice beams, as shown in figure 1. A large parnon of th~se tests have been carried out at relatively high loading rates. Thus, If the loading rate is high, it may be justified to assume that ice behaves approximately as a linearly elastic...
Proceedings Papers

Paper presented at the SPWLA 55th Annual Logging Symposium, May 18–22, 2014
Paper Number: SPWLA-2014-OOOO
... and ck strength test dulus and Poisso RESS FOR IS S rd or traditiona stress for an iso ). ertically polariz (9) tensor for a V measurement a ratio. sor for a transvers ese components horizontal Youn ing device and n s ratio. OTROPIC AN l equation used tropic linear ela SPWLA 55 3 ed TI nd ely are g s...
Proceedings Papers

Paper presented at the ISRM Regional Symposium - 7th Asian Rock Mechanics Symposium, October 15–19, 2012
Paper Number: ISRM-ARMS7-2012-031
... th MPa, which , the laborat and this valu et al. (2012 es) vars et al., act orientati lap and "slid tact model a wly assigne rength and c be solved a nd 2D spec frees loaded mulate the b this paper, h um anisotro sion in joint , the assigne are explain ence, the str sed. at the failur bbass and non...
Proceedings Papers

Paper presented at the 2011 SEG Annual Meeting, September 18–23, 2011
Paper Number: SEG-2011-2216
... previous section, the error in results 3311S 3311S 10-3 10-2 10-1 100 10-3 10-2 10-1 100 -0.5 0 0.5 1 Aspect ratio Es he lb y te ns or S1111 S3333 S1133 S3311 S1313 S1212 S1122 Exact Approx. Mura Iso 0 0.2 0.4 0.6 0.8 1 Aspect ratio Es he lb y te ns or S1111 S3333 S1133 S3311 S1313 S1212 S1122 Exact Approx...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-174
... Fliessfunktion und das Bruchkriterium durch Verwendung eines transformierten Spannungstensors enthalten: Σ ij = A ijkl σ kl . Die Eignung des Modells wird demonstriert, indem es bei einem geschichteten Sedimentgestein, Tournemire Tonschiefer, angewendet wird. 1 INTRODUCTION In many rocks, due to the...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 4–7, 2009
Paper Number: SPE-124236-MS
... Elastic undrained -80 -40 0 40 80 0 0.2 0.4 0.6 0.8 1 Normalized Radial Distance Ef fe ct iv e R ad ia l S tr es s (M Pa ) Poroelastic Elastic drained Elastic undrained a) b) 0 30 60 90 120 150 180 0 0.2 0.4 0.6 0.8 1 Normalized Radial Distance Ef fe ct iv e Ta ng en tia l S tr es s (M Pa ) Poroelastic...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2005, May 18–20, 2005
Paper Number: ISRM-EUROCK-2005-014
... defined by: -PeP=L. PI = l;pP -+ l;eP = 1 PI ' P P where 7/ is the intrinsic mass density of the ,Bth fluid component C;/ = pfJ I¢» and PI is the total fluid mass density (per unit volume of the fluid). The chemical potential s RT1 eSJ.J n MS can be linearized by approximating In eS such that: fJ -fJ-fJa...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-190
... wird die Wellenausbreitung manchmal stark behindert durch die Interferenz mehrfach gestreuter Wellen (sogenanntes "stop-pass" Verhalten). Es konnte gezeigt werden, dass Wellen, welche sich parallel zu den Kluften ausbreiten, mehrere gebundelte Eigenfunktionen aufweisen mit Geschwindigkeiten und...
Proceedings Papers

Paper presented at the SPE/ISRM Rock Mechanics Conference, October 20–23, 2002
Paper Number: SPE-78162-MS
... t = 24 hrs t = 6 hrs t = 3 hrs t = 1 hr t = 0.1 hr = 0.4 0 = 4 MPa D = 1.0E-08 m2/sec r / R P or e pr es su re , M P a Figure 3. Pore pressure distribution around the borehole. -5 0 5 10 15 1 2 3 4 5 t = 120 hrs t = 72 hrs t = 24 hrs t = 6 hrs t = 3 hrs t = 1 hr t = 0.1 hr = 0.4 0 = 4.0 MPa...
Proceedings Papers

Paper presented at the 9th ISRM Congress, August 25–28, 1999
Paper Number: ISRM-9CONGRESS-1999-301
... temporaryand permanentliningsnormal to the tunnelaxis (leastfavourablerock zone) aftercompleteexploita- tionof the,es~matedconvergence ' ; '. " ~ ,; u 1 I In the following we leave out a discussion of the computational investigations and mention only that' the characteristic line method provides useful...
Proceedings Papers

Paper presented at the 1998 SEG Annual Meeting, September 13–18, 1998
Paper Number: SEG-1998-1483
..., perform depth pro- cessing in TTI media. Using the exact NMO equation, we examined the propagation of errors in the moveout velocities into the estimated values of the anisotropic parameters and es- tablished the necesary conditions for a stable inversion procedure. Determination of the individual values...

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