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Keywords: effective stress
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Proceedings Papers

Paper presented at the SPWLA 62nd Annual Logging Symposium, May 17–20, 2021
Paper Number: SPWLA-2021-0116
... the influence of increasing effective stress. The stiff porosity, arising 1 = (1 + (1) from low aspect ratio pores, increases the P-wave Vp Vma Vf velocity as the stiff pores resist deformation. In this model, the compositional factors influencing Vp By the 1990s, sufficient log data was becoming available...
Proceedings Papers

Paper presented at the SPWLA 55th Annual Logging Symposium, May 18–22, 2014
Paper Number: SPWLA-2014-OOOO
... coefficient shale stiffness coefficient moduli vertical poisson Symposium shear anisotropy ratio effective stress horizontal young minimum horizontal stress Poisson elastic moduli ANNIE model SPWLA 55th Annual Logging Symposium, May 18-22, 2014 1 PREDICTING THE STIFFNESS TENSOR...
Proceedings Papers

Paper presented at the SPWLA 49th Annual Logging Symposium, May 25–28, 2008
Paper Number: SPWLA-2008-GG
... Abstract Effective stress laws and their application are not new, but are often overlooked or mis-applied. As we observe in deepwater GoM Lower Tertiary (LT) sands, the effective stress coefficient deviates significantly from one and can be quite different for different rock properties...
Proceedings Papers

Paper presented at the SPWLA 44th Annual Logging Symposium, June 22–25, 2003
Paper Number: SPWLA-2003-HHH
... if the latter is compressed while allowing the fluid to escape, as shown in Figure 1. This implies that ct should be a strong function of permeability, although other parameters, i.e., effective stress, lithology, cementation, compressibility etc., may also be influential to some degree. Since the petroleum...
Proceedings Papers

Paper presented at the SPWLA 40th Annual Logging Symposium, May 30–June 3, 1999
Paper Number: SPWLA-1999-HHH
... resolution borehole wall images. Reservoir Characterization Etchecopar guenot effective stress breakout reservoir geomechanics Maury borehole wall rupture mode lateral shift borehole new borehole imagery technique interpretation Drilling stress field Upstream Oil & Gas regime...
Proceedings Papers

Paper presented at the SPWLA 38th Annual Logging Symposium, June 15–18, 1997
Paper Number: SPWLA-1997-D
... measurements showed little anisotropy effect around the wellbore over the gas-bearing sand section. Reservoir Characterization frequency log analysis well logging Nile Delta polarization shear wave velocity effective stress Upstream Oil & Gas investigation shear wave arrival anisotropy...
Proceedings Papers

Paper presented at the SPWLA 38th Annual Logging Symposium, June 15–18, 1997
Paper Number: SPWLA-1997-FF
... cause of this time dependent decrease of ?t (or increase of velocity) is an increase of effective stress and a concomitant reduction of porosity near the wellbore. log analysis drilling fluid overpressured formation Upstream Oil & Gas shale Symposium sonic-while-drilling data waveform...
Proceedings Papers

Paper presented at the SPWLA 37th Annual Logging Symposium, June 16–19, 1996
Paper Number: SPWLA-1996-NN
... of pore pressure, and an insight into the prevailing major components of stress in the reservoir, The output is a mean effective stress that is based on a substantive description of the stress regime in situ and is therefore considered to be more definitive than corresponding data derived from regional...
Proceedings Papers

Paper presented at the SPWLA 37th Annual Logging Symposium, June 16–19, 1996
Paper Number: SPWLA-1996-X
... Characterization structural geology force balance basin well logging overburden horizontal stress reservoir geomechanics Upstream Oil & Gas pore pressure situ rock mechanics system Symposium effective stress strain relationship Poisson stress path equation leakoff test situ strain loading...
Proceedings Papers

Paper presented at the SPWLA 36th Annual Logging Symposium, June 26–29, 1995
Paper Number: SPWLA-1995-AA
... ABSTRACT Sedimentary rocks are constantly under high stress in the subsurface. Within a few years there is a pseudo-static equilibrium between effective stress and the load bearing capacity of the grain matrix framework. Rock porosity remains in pseudo-static equilibrium with effective stress...
Proceedings Papers

Paper presented at the SPWLA 36th Annual Logging Symposium, June 26–29, 1995
Paper Number: SPWLA-1995-EEE
... North Sea well logging central graben area Upstream Oil & Gas pore pressure calibration log analysis structural geology average pore pressure well data complex reservoir overburden high pressure high temperature well Symposium fracture pressure pore pressure estimate effective stress...
Proceedings Papers

Paper presented at the SPWLA 12th Annual Logging Symposium, May 2–5, 1971
Paper Number: SPWLA-1971-BB
... (Figure 1), range from 0.86 to 0.92 psi per foot. Reservoir Characterization Fluid Dynamics structural geology petrophysical study acoustic velocity-porosity relationship Upstream Oil & Gas overpressured sandstone reservoir effective stress vicksburg trend Texas laboratory McAllen...

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