... unstable or stable in present stress state. A pre-existing discontinuity, i.e. fault or fracture, will re-activate when the shear strength on the fault/fracture plane is exceeded i.e. slippage occurs along the discontinuity. The discontinuity is then referred to as unstable. If the shear strength...

... general tendencies in hydraulically conductive fractures’ patterns being observed. Presentation Date: Wednesday, September 18, 2019 Session Start Time: 8:30 AM Presentation Start Time: 11:00 AM Location: 305 Presentation Type: Oral stress state stress field principal stress orientation...

... and the stress state in the subsurface. We perform the analysis of May 17, 2012 Mw4.8 Timpson, TX earthquake. We build a simplified geologic model and run the suite of simulations. We find that even in unfavorable orientation of maximum horizontal stress relative to fault strike, the fault can slip...

... on pre-existing fractures and faults with a wide range of orientations, thus creating an interconnected permeable fracture network. We demonstrate the basic principles of stimulating slip on poorly oriented faults using the stress state for a horizontal well in the Barnett Shale where fracture...

... stress state friction coefficient Byerlee , J. , 1978 , Friction of rocks : Pure and Applied Geophysics , 116 , 615 – 626 , 10.1007/BF00876528 . Ellsworth , W. L. , 2013 , Injection-induced earthquakes : Science , 341 , 1225942 , 10.1126/science...

...Downhole microseismic data processing: consistency of locations, source mechanisms and stress state Zuzana Jechumtálov Leo Eisner, and Jan Procházka, Seismik s.r.o.; Fangdong Chu and Jiaojun Rong, BGP Inc., China National Petroleum Corporation Summary We present results of processing...

... technique has become general all over the world, and micro-seismic monitoring is widely used to image hydraulic fractures in the subsurface. It is important to understand relationship between stress state in the subsurface and associated micro-seismic events for accurate and effectual development...

... pressure. log analysis fang dispersion crossover flexural dispersion crossover borehole stress-induced anisotropy cheng well logging stress state upstream oil & gas stress-induced anisotropy equation anisotropy reservoir geomechanics flexural wave propagation stress compression...

... Summary The orientation and size of fractures created during hydraulic stimulation is governed by the in-situ stress state. Reservoir production changes both the magnitude and the direction of the principal stresses, and these stress changes can be calculated using a geomechanical model...

... around a borehole for any given stress state. anisotropy berea sandstone reservoir characterization tensile stress stress state mavko stress concentration iteration azimuth reservoir geomechanics strain measurement hydrostatic pressure log analysis convergence experiment uniaxial...

... ABSTRACT Hydraulic fracture stimulation is the only technology today that is capable of transforming the nanodarcy organic shale into an economic gas reservoir. Geomechnics, the science of the subsurface stress state, mechanical rock properties, and their interaction, has gained elevated...

...-increase. Therefore, S-waves have the potential to be used as a tool to monitor horizontal stress changes. Introduction Knowledge of the subsurface stress-state is an important factor of oilfield management. Knowledge of stress conditions in the overburden and the reservoir can help to avoid drilling...

... of compliant pores. R values were also found to be strongly dependent on the stress states, hence using a constant value of R from the seafloor to the reservoir depth should be avoided. Reduced stress sensitivity of velocities at higher confining pressures led to lower absolute values for R. R values...

... pressure. Theory and Method The stress state on the wall of a fracture filled with fluid can be characterised by a dynamic equilibrium of all volumetric forces acting on an elementary volume V of the rock at a particular point (the pressure of the fluid filling a fracture is counterbalanced by the rock...

... ABSTRACT No preview is available for this paper. tiltmeter depth range stress state hydraulic fracture reservoir geomechanics tilt signal upstream oil & gas signal strength tiltmeter signal hydraulic fracturing orientation san joaquin valley imaging enhancement project...

... ABSTRACT No preview is available for this paper. stress-induced anisotropy reservoir characterization axis triaxial machine upstream oil & gas stress state shear-wave splitting stiffness tensor experiment transverse isotropic media equation diagonally polarised shear-wave...

... ABSTRACT No preview is available for this paper. axial stress laboratory measurement stress path seismic measurement well logging anisotropy stress state reservoir characterization laboratory dependence reservoir geomechanics shear velocity implication magnitude stress...