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Geostatic and lithostatic pressure

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Journal Articles
OIJ 2021 (09): 15–17.
Paper Number: OIJ-2021-09-015-017-RU
Published: 01 September 2021
... conditions of static equilibrium in the rocks, is able to create a pressure in the upper part of the forming lower domain that exceeds the lithostatic (geostatic) pressure. When the ultimate strength of rocks is exceeded, a short-term rupture of their continuity and "overflow" of fluids through...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 96, September 2–5, 1996
Paper Number: ISRM-EUROCK-1996-140
.... In this paper, we examine rock-salt permeability: even if small, it results in some pressure release and leads to a final equilibrium pressure that is substantially lower, in many cases, than the lithostatic pressure. Then, the fracture risk is restricted to the transient period during which the initial...
Journal Articles
Petrophysics 6 (05).
Paper Number: SPWLA-1966-vVIn5a1
Published: 01 September 1966
... oxidation. 3. A Lithostatic or Geostatic trap results from the entrapment of fluids in non-competent formations and within which they are s e a l e d by the weight of the overlying lithologic column rather than by the pressure of the hydrostatic column. Fluid pressures in such traps are unusually high...
Proceedings Papers

Paper presented at the 2nd International Discrete Fracture Network Engineering Conference, June 20–22, 2018
Paper Number: ARMA-DFNE-18-1106
... to lithostatic unloading for a range of pre-existing discontinuity configurations, lithological types and variations in in-situ stress regimes. Preliminary modelling results have provided improved understanding of the vertical and lateral extent of potential DFN response for a range of excavation profiles...
Proceedings Papers

Paper presented at the Rock Mechanics in Petroleum Engineering, August 29–31, 1994
Paper Number: SPE-28127-MS
... and Geol. Soares de Magalhlies n j E :J Z ~ 0 '! 0 0 0 '; '1 "1 c c 0 c c 0 c c c ~ c I? c c '! "I -; r N OJ .. II .. 83eringd;J) ~M; OAt I IIICqsIl:ul I Figure 2: Statistical distribution of the orientation of the geolOgical features ROCK A.-IASS DATA Geostatic Stresses Hydraulic fracturing...
Journal Articles
SPE Form Eval 11 (01): 5–10.
Paper Number: SPE-28139-PA
Published: 01 March 1996
... of overpressuring: the looser the initial skeleton, the greater the pore pressure response.12 It is possible, by this mecha- nism, to reach near-geostatic pore pressures with normal porosities for the depth of burial, as discussed below. Fig. 1 illustrates this variation in porosity with different overpres- sure...
Journal Articles
SPE Prod & Oper 34 (04): 703–724.
Paper Number: SPE-180364-PA
Published: 26 June 2019
... of the geomechanical model. The displacement and rotation in the x – and y– direction were fixed on the outer boundary and the inner boundary was modeled to be symmetric along the x –axis. The displacement and rotation of the model bottom were fixed in the z –direction. Lithostatic pressure was applied to the top...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-347
... equation is present below (Equation 1). The undefined mechanism was discovered as creep in the grain contacts caused by dissolution of the salt and increase of solubility due to the high pressure in the contacts between the grains (Poiate et al. [3 RT Q RT Qn o ef o e...
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-2014-043
... Summary This paper discusses the design of underground salt caverns, opened by solution mining, for the production of brine and storage of natural gas under high pressures. The caverns are located in a salt basin in the northeast region of Brazil. Special attention is given...
Proceedings Papers

Paper presented at the 4th ISRM Congress, September 2–8, 1979
Paper Number: ISRM-4CONGRESS-1979-037
...), is applicable. Since appreciable changes in lithostatic loading will only arise with gross changes in cavity geometry which never occur, the assumption of superposition permits the lithostatic loading to be neglected and to consider the imposed loading by pressurization in iaolation. 3.2 Mathematical expression...
Proceedings Papers

Paper presented at the 47th U.S. Rock Mechanics/Geomechanics Symposium, June 23–26, 2013
Paper Number: ARMA-2013-234
... use solid elastic or elastoplastic formulations to model sediment response, although Nikolinakou et al [10] used coupled poro-elastoplastic analyses to predict the transient pore-pressure and stress changes around salt. Most published analyses of stresses around salt bodies have used simple...
Proceedings Papers

Paper presented at the 9th World Petroleum Congress, May 11–16, 1975
Paper Number: WPC-16414
... and p the minimum primary pressure which occurred at the position of the crack at the borehole wall. This pressure p is set equal to the lithostatic pressure P = YT (2) of the virgin rock by the authors, independent of the well bore diameter, of the type of salt rock, and of the additional stress caused...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-378
... Abstract This paper discusses the design of underground salt caverns, opened by solution mining, for the production of brine and storage of natural gas under high pressures. The caverns are located in the salt basin in Maceio City, Alagoas State, at the northeast region of Brazil. Special...
Proceedings Papers

Paper presented at the SPE Asia Pacific Oil and Gas Conference and Exhibition, October 16–18, 2000
Paper Number: SPE-64464-MS
... pressure close to the lithostatic pressure, strength of the rock will equal its strength at the coaxial compression that leads to displacing the rock at very small stresses. As a result, the horizontal zonation of microfracturing is broken by the tectonic movements of separate blocks and the magmatic...
Proceedings Papers

Paper presented at the 13th ISRM International Congress of Rock Mechanics, May 10–13, 2015
Paper Number: ISRM-13CONGRESS-2015-394
... actual geologic geometries, only the evolutionary approach can provide a detailed description of the stress history of shales, which is essential for predicting stress, porosity, and pore pressure and, more generally, for understanding Earth processes related to salt-hydrocarbon systems. Introduction...
Proceedings Papers

Paper presented at the 49th U.S. Rock Mechanics/Geomechanics Symposium, June 28–July 1, 2015
Paper Number: ARMA-2015-108
...), and the model is wide enough such that the side boundary to be unaffected by any stress perturbations. The initial stresses in the model are geostatic, with a horizontal-to-vertical effective stress ratio of K0 = 0.8. Pore pressures are assumed hydrostatic and do not change during the analysis (drained...
Proceedings Papers

Paper presented at the 55th U.S. Rock Mechanics/Geomechanics Symposium, June 18–25, 2021
Paper Number: ARMA-2021-1332
... to the rock volumetric composition but objective of studying how the reservoir varies from an also to the pore pressure reduction and the compaction initial geostatic state to a final dynamic state of that this produces (in-situ anisotropy). As this zone is production. The constitutive laws of the different...
Proceedings Papers

Paper presented at the ISRM International Symposium - EUROCK 2010, June 15–18, 2010
Paper Number: ISRM-EUROCK-2010-002
... or talc or because the pore pressure is high and nearly lithostatic. The other alternative is that major faults are statically strong but dynamically weaken during seismic slip. What physi- cal process governs this dynamic weakening is still an open question. 2.3 Dynamic weakening mechanisms As emphasized...
Proceedings Papers

Paper presented at the Abu Dhabi International Petroleum Exhibition & Conference, November 13–16, 2017
Paper Number: SPE-188606-MS
... properties, i.e. Young's modulus and Poisson's ratio, and for stress estimations. Density log data is converted to a gradient (psi/ft) by multiplying by the fresh water gradient (1 g/cc = 433 psi/ft). At the top treatment depth, overburden pressure is obtained by multiplying by the overburden (geostatic...
Proceedings Papers

Paper presented at the Rock Mechanics in Petroleum Engineering, August 29–31, 1994
Paper Number: SPE-28116-MS
... is the magnitude of the difference between inter- nal pressure and geostatic pressure, but also the period of time over which the lowest internal pressures are maintained, a factor which may become critical in some deep gas caverns, but in most cases con- vergence rates are relatively small and thus do not lead...

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