... effective stress coefficient reservoir geomechanics pore pressure geophysics moduli bulk modulus structural geology pore exploration geophysicist 10 composite spherical shell differential pressure poroelasticity Poroelasticity of compositionally heterogeneous rocks with application...

... ABSTRACT Understanding seismic wave propagation can improve seismic interpretation and reservoir characterization, especially in media containing pores and cracks as a function of differential pressure, i.e., confining minus pore pressure. Production from tight-sandstone gas reservoirs...

... for permeability is found to be greater than one (nk = 1.28) at the lowest differential stress. We observe a strong dependence of effective stress coefficient with differential pressure – effective stress coefficient decreased from 1.28 at 2.5 MPa to 0.65 at 60 MPa. The measured permeabilities obey a simple power...

... permeability differential pressure calcium carbonate reservoir permeability evolution carbonate dissolution experiment variable effective stress upstream oil & gas fluid dynamics wormhole formation complex reservoir dissolution andrew fraser-harris experimental time experimental observation...

... ABSTRACT The responses of static and dynamic moduli of porous rocks to the changes of differential pressure have been explained by the effects of pore microstructure, i.e., the effects of cracks (soft pores) and intergranular (stiff) pores. Specifically, cracks play a major role on the elastic...

... on geomechenics. Presentation Date: Wednesday, September 27, 2017 Start Time: 10:35 AM Location: 351D Presentation Type: ORAL seg seg international exposition bulk modulus elastic property porosity pore stiffness moduli ultrasonic velocity static property relation differential pressure...

... ABSTRACT We measured velocities and their attenuation of one Berea sandstone at the different water saturations with fixed differential pressure in seismic frequency band (2-800Hz). Plus, at dry and full water saturation condition, the rock sample was measured at various differential pressures...

..., temperature, and fluid saturation. For unaltered core samples, the wavespeeds decrease with temperature, suggesting a strong temperature dependence on the fluid. Measurement runs at a constant differential pressure shows the wavespeeds increasing with confining pressure. Furthermore, fluid saturation effects...

... attenuation differential pressure permeability glycerol laboratory study experiment dispersion extensional attenuation reservoir characterization berea sandstone dispersion effect viscosity dependence upstream oil & gas frequency moduli gurevich mpa mikhaltsevitch seismic...

... lower shear-wave anisotropy than the core in the shallower formation. Figures 2 and 3 show compressional and shear velocity measurements, plotted as a function of differential pressure. The pore pressure was zero in the experiment. All five velocity measurements were made on a single horizontal plug...

... complement this analysis through the identification of numerous micro-cracks within and proximal to kerogen bodies. P-wave anisotropy increases up to 150% at 50 MPa differential pressure after heating to the wet-gas zone, indicating a contribution to the anisotropy in addition to micro-cracking - potentially...

... Summary We have measured velocity anisotropy on 13 core samples from an organic shale oil reservoir with differential pressure up to 3000 psi. The pressure effect on velocities is generally stronger in direction normal to the bedding than along the bedding, and thus the anisotropy decreases...

... inputs and should have better performance in pore pressure prediction. Then performances of pore pressure prediction by using differential pressure and effective pressure respectively are compared. Due to delicacy in estimating the effective stress coefficient and complexity of in-situ fluid properties...

... as testified by the negligible change in porosity measured after injection. Decreasing the differential pressure acting on the core plug also decreased both P and S-wave velocities by 60 and 20 m/s respectively. Decreasing the differential pressure simulates an increase in pore pressure, which is experienced...

... at differential pressures greater than 15 MPa). Because of the pressure-dependence of the differences, they cannot be due to the fact that the sandstone has about 20% of non-quartz minerals, but must be due to the microgeometry of the rock, in particular to the closing of microcracks with increasing pressure...

... frequency moduli pore bulk modulus seg seg denver 2010 dispersion saturation geophysics differential pressure porosity high pressure gassmann p-wave velocity modeling & simulation reservoir characterization upstream oil & gas mechanism biot s-wave velocity model...

... colorado school elastic property mechanism heavy-oil sand frequency dependent elastic property intrinsic attenuation effective medium approach heavy oil sand seg seg denver 2010 upstream oil & gas attenuation batzle log frequency differential pressure reservoir characterization...

... anisotropy upstream oil & gas geophysics experimental study frequency seg seg denver 2010 anisotropic elastic moduli elastic property hofmann colorado school phase velocity stiffness component differential pressure permeability shale-an experimental study shale reservoir...

..., essential in improving carbonate reservoirs monitoring. In this paper, we study the effect of differential pressure (Pd) on compressional and shear wave velocities(Vp, Vs).We used Vp, Vs, Pd, porosity, and permeability measurements made by a research commercial lab on 61 carbonate core plug samples from...

... permeability differential pressure manco shale sandstone permeability value storage specific storage international exposition reservoir characterization seg houston 2009 theoretical analysis porosity flow rate compressive storage lyon sandstone flow in porous media geophysical...