... research flow in porous media macropore attenuation data collection chhatre toluene core plug hydraulic fracturing pore pressure porosity Microstructural Investigation matrix Upstream Oil & Gas expertise permeability matrix permeability fracture tress-dependent permeability...

... attenuation, the fast neutron-gamma coupled field theory is put forward to describe the distribution of inelastic gamma field. The inelastic gamma field distribution is characterized by the inelastic scattering cross section, fast-neutron scattering free path and formation density, and the influence...

... in a coplanar configuration, enabling azimuthally sectored compensated attenuation measurements for the various wave types. In this paper, we look at the theoretical background, physics, and modeling of these new EMATs as well as the various guided-wave modes they can generate. We then review additional...

... field-test result log analysis attenuation borehole GGD well logging quality control gamma ray SNGD axial resolution cross section correction sourceless neutron-gamma density detector SNGD measurement schlumberger engineering center april 2013 Log Quality Control April 2013...

.... In a pore pressure oscillation method, the sample is first stabilized at a certain pore pressure, then a small sinusoidal pressure wave is applied to the upstream side of the sample, and the pressure response at the downstream side is recorded. Permeability is deduced from the attenuation and phase shift...

... is solid. (c) Microporosity assignment, the microporous regions is divided into 100 bins and assigned a microporosity value between 0 and 100%, indicated by greyscale. (d) An SEM image of the same sample (images a-c are the registered tomographic equivalents). (e) X-ray attenuation histogram of the three...

... to attenuate the tool (extensional) waves in the frequency range of 10-20 kHz, this allows for the optimum acquisition of monopole data for the compressional-wave velocity measurement. For modeling the Stoneley waves that are monopole waves dominant in the low-frequency range, the effect of the isolator...

...Chris Hacket; Jorge O. Parra A modeling scheme is presented and applied to analyze the response of reservoir flow units to a variety of acoustic/seismic measurement techniques, and to determine the frequency band in which flow units can be observed and characterized. The model estimates attenuation...

... Modeling & Simulation log analysis log analyst conductivity saturation gas saturation count rate attenuation transition zone pnc count rate steam saturation effect University Polyachenko log analyst march-april 1994 interpretation Upstream Oil & Gas porosity invasion travel time...

... the Stoneley wave excitation. When intrinsic attenuation resulting from formation and borehole fluid inelasticity is present, the tool reduces Stoneley attenuation from the fluid and increases the attenuation from the formation. For a permeable porous borehole, the simplified Biot-Rosenbaum model of Tang et al...

... be used to design velocity and attenuation picking schemes and shows how source frequency spectra can be selected to optimize results in specific applications. Synthetic microseismograms are an effective tool in waveform-interpretation theory; they demonstrate how shear-arrival picks and mode-attenuation...

...D.R. Burns This paper is a review of the application of full-waveform acoustic logs to in-situ permeability estimation. The slowness and attenuation of the tube-wave arrival in full-waveform acoustic logs is sensitive to variations in the in-situ permeability. The tube-wave slowness can provide...

... of compressional or shear amplitudes with fracture aperture or permeability. However, the most reliable and frequently cited of these methods is based on the consistent correlation between measurements of tube-wave or Stoneley-wave attenuation and independent estimates of fracture permeability. Tube-wave...

...P.C. Arditty; U. Falt; F. Mathieu; P. Staron A new method for characterization of fractured reservoirs has been developed from wide experience in acoustic logging and from results of theoretical research. The method is based on the use of shear (S)-wave and Stoneley-wave attenuation, two parameters...

... in the borehole and formation that may affect Stoneley-wave attenuation, a model for inferring permeability has been developed. The model, referred to as the Double Attenuation Model, approximates the results obtained from theoretical and experimental developments. This method was used in a field that produces...

...-wave attenuation determined from acoustic-waveform logs was related to the hydraulic permeability of equivalent infinite plane fractures; these results agree qualitatively with straddle-packer permeability tests when the combined effects of differing scales of investigation and borehole enlargements...

... to construct a unique relationship between relative mode excitation and lithology. log analysis synthetic waveform shear velocity Reservoir Characterization frequency borehole application well logging attenuation Paillet seismic velocity Poisson amplitude compressional Cheng Upstream Oil...

...W.R. Hoyle The attenuation curve of a microwave frequency tool operating at 1.1 GHz has been observed to correlate very well with the SP and gamma ray curves over sandshale sections of wells having fresh mud-saline formation water conditions. Low attenuation values are expected for clean permeable...

... in the range of 10 to 40 kHz. 1 1 1973 1 1 1973 1973. Society of Petrophysicists & Well Log Analysts log analysis resonant frequency receiver amplitude bandwidth Upstream Oil & Gas attenuation epoxy transmitter well logging impedance kHz frequency response frequency...

... of the two logs are somewhat different. For the Cement Bond Log a short spacing is desired in order to show more clearly the attenuation rate of the casing arrival. For the VDL a longer spacing is desired in order to show the formation arrivals in well bonded intervals. To satisfy these differing...