... Summary Acoustic logging-while-drilling (LWD) is used to measure formation velocity/slowness during drilling. In a fast formation where the formation shear velocity is larger than the borehole fluid velocity, monopole logging can be used to obtain both formation compressional and shear...

... properties to determine a consistent model at each depth. The inversion uses all sonic slownesses, compressional, fast and slow shear, as well as Stoneley shear along with the fast shear azimuth and density to provide a continuous output of either stiffness moduli or velocities at each depth. The prior...

... compressional and shear slownesses by measuring the corresponding refracted waves. In a slow formation where the shear slowness is larger than the borehole fluid slowness, other logging methods, such as quadrupole LWD, is used instead for shear slowness measurement due to the missing of fully refracted shear...

... incidence velocity variation for the compressional and two principal shear wave components (fast and slow) due to changes related to mineralogy, porosity, water saturation, fracture density, and pressure at the target unit. The forward modeling process involves varying a single parameter over its...

... ABSTRACT Real-time sonic logging data processing becomes a nontrivial task to accurately and automatically evaluate both the compressional and shear slowness when human interactions are not allowed and when the computing time is limited between different transmitter firings. To answer...

... of this study was to investigate the feasibility of second harmonic measurements for evaluating formation porosity. Presentation Date: Thursday, October 20, 2016 Start Time: 11:00:00 AM Location: 168 Presentation Type: ORAL nonlinear coefficient porosity compressional rock sample van den abeele...

... to in-situ conditions in a laboratory environment. Specifically, compressional and shear velocities are measured in 0°, 45°, and 90° orientation to bedding plane of the particular shale sample. In previous studies, these measurements were accomplished using three-plug-method, which would require to core...

..., compressional and shear wave attenuation, in Deccan basalt is not yet investigated systematically in a laboratory. Laboratory investigations of seismic wave attenuation and physical properties of in-situ rocks help determine mechanisms responsible for observed seismic wave energy loss in Deccan basalt. Thus...

.... resistivity porosity ellipsoid aspect ratio reservoir characterization artificial intelligence effective stress approximation modeling upstream oil & gas compressional electrical dual pore shape modeling seg denver 2014 formation factor electrical sca model consistent approximation...

... Summary We propose a numerical method to estimate compressional and shear velocities at the laboratory scale for porous rock samples. The methodology is based on a finite difference implementation of the elastic wave equation. Results from the numerical models were compared to velocities...

... inversion interpretation of pore structure and predict interested reservoirs. seismic wave propagation speed well logging fracture pore porosity compressional wave impedance log analysis intergranular pore reservoir characterization upstream oil & gas porosity curve rock physical...

... of sonic data are insufficient for a complete inversion. compressional upstream oil & gas elastic property artificial intelligence inversion result well logging ti parameter ti model sonic data anisotropy thomsen application heterogeneous formation seg houston 2013 gamma ray...

... injected into the composite material to simulate different rates of fluid saturation. Porosity in our assembled cracked media is 2.5% and crack density is estimated as 14%. Our results show changes in ultrasonic compressional and shear wave velocities ranging from 1% to 15% in different directions...

... Summary We present laboratory measurements and analysis of twenty UAE carbonates samples which include quantitative mineralogy, total and effective porosity, permeability and compressional and shear wave velocities as a function of effective pressure and saturation. Brine saturated...

... Summary Compressional and shear reflection data provide critical measurements of velocity and attenuation that are necessary for numerical simulations of site response from earthquake energy and seismic investigations to lithologic and pore characterizations. Many problems associated...

... ABSTRACT The purpose of this study is to understand the effects of injecting carbon dioxide rich brine on the elastic and transport properties of the Lower Tuscaloosa sandstone of Cranfield, Mississippi. We measured compressional and shear wave velocities before and after injecting one...

... under different stress tenure. The phenolic boards were coupled together with the help of a pressure device and uniaxial stress was gradually increased while time arrival and velocity measurements were repeated. Results show maximum increase in compressional and shear wave velocities ranging from 4...

... ABSTRACT Laboratory experiments were performed on synthetic orthogonal fractures to determine the effect of intersections on fracture interface waves. Compressional and shear waves were propagated along fractures as well as along an intersection for a range of normal stresses (1.4 MPa to 14...

... Summary and Intro In previous publications, (SPWLA 2005, SPE 2005) an improved methodology was described to derive pseudo acoustic logs – both compressional and shear – from other petrophysical measurements. Solutions to the Gassmann and Krief geophysical models were presented, together...

... the anisotropy results. Compressional and shear borehole sonic data are traditionally used for both seismic calibration and geomechanical modeling. The complexity of the velocity models used for time to depth conversion or AVO analysis for seismic calibration has been dependant on the input data or current...