... measurements, inelastic and capture spectra acquired by PN tools follow Poisson statistics (Knoll, 1977). Therefore the dependence of rel- ative uncertainty of CY on the concentration of carbon in the formation in the case of a PN spectroscopic meas- urement is defined by: = (1) where: - UnCYrel is relative...

... absorption depends strongly on the energy of the photon and increases as the energy decreases, as indicated by Figure 1. Photoelectric Absorption Cross Sections 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03 1.0E+04 10 100 1000 Energy (keV) C ro ss S ec tio n (b ar ns ) Z=14 Z=20 Figure 1...

... geometry reveal that, for plausible parameter choices, the effect is weak, depends on the type of spatial distribution, and can be quantitatively understood using the theory we developed. Introduction Despite the steady progress made on the subject of diffusion in complicated porous media (Grebenkov...

... gradients in the pore space as the external magnetic field is applied. The strength of this gradient varies over a wide range depending on the amount and distribution of paramagnetic impurities. Along with the external magnetic field gradient, this induced field gradient enhances diffusion thereby affecting...

... log analysis paramagnetic sphere secular relaxation rate well logging relaxation rate relaxation free diffusion regime time scale concentration particle diffusion dependence motionally surface concentration gradient equation Upstream Oil & Gas regime paramagnetic particle...

.... However, as im- plemented, oil field correlations ignore the dependence on molecular size specified by Stokes-Einstein. Includ- ing the molecular size as a parameter precludes the pos- sibility of a universal linear correlation and requires a series of parallel lines for samples with differently sized...

... and internal gradients and indicating oil is wetting some portion of the rock surface. The T1 and T2 distributions of the OBMF depend on whether the whole mud is pressed or a supernatant is filtered. The filtered OBMF was found to contain 0.08 micron paramagnetic particles. Diffusion editing and CPMG T2...

... caliper measurement borehole Symposium spwla 41 well logging accuracy mud velocity correction ultrasound velocity dependence Upstream Oil & Gas velocity correction Bin standoff bin 1 drilling operation transducer caliper value Caliper Log diameter correction caliper SPWLA 41...

... by competing mechanisms of grain rearrangement and initial cementation during early diagenetic history of the sediments. The impact of clay in poorly consolidated sands is diminished, while the dependence on the grain sorting, loading history, and pore fluid chemical activity is increased. The compilation...

... in this review will be on experimental validation of the methods as well as theoretical soundness. well logging Ellis short spaced detector density measurement correction log analysis formation pe formation density functional form compensation dependence equation detector Minette moake...

... response shows a nearly constant phase angle behaviour in the range from 10kHz to 100 kHz and the classical Cole-Cole behaviour with a depressed semi-circle from 100 kHz to 2 MHz. The frequency response of the complex impedance presents two regions of distinctive frequency dependence: the first one...

..., the frame moduli depend on mineralogy, cementation, and grain contacts. For uniformly consolidated sandstones, we advance three theoretical predictions: the ratio Kb/N is independent of ?, Kb and N are nearly linear functions of ?, and Kb and N are roughly linear in Pc 1/3 where Pc is the confining...

... ABSTRACT Laboratory data have been collected during a continuous imbibition/drainage experiment that show a clear dependence of elastic wave velocities on the details of the microscopic distribution of water and air in the pore space of a sandstone. Compressional wave velocity Vp was measured...

... ABSTRACT Microscopic fluid distribution can have a significant effect on elastic wave velocities. Evidence of this effect is found in laboratory data presented by Domenico (1976, 1977) in which different saturation techniques produced very different results for the dependence of elastic wave...

... Upstream Oil & Gas SPWLA Thirtieth AnnualLoggingSymposium length scale brine conductivity Reservoir Characterization exponent clay geometry saturation dependence fraction equation hanai-bruggeman equation geometry conduction clay counter-ion structural geology porosity...

... standoff equation june 29-july 2 required correction quality curve correction term count rate Density correction dependence SPWLA 1 kenty-Eighth Annual Logging Symposium, June 29-July 2, 1987 IMPROVED DENSITY LOG LITHOLOGY IDENTIFICATION USING A BOREHOLE-COMPENSATED PHOTOELECTRIC FACTOR G.L...

... monolayer saturation dependence Reservoir Characterization adsorption adsorbate frequency range pore space surface layer SPWLA TWENTY-SEVENTH ANNUAL LOGGING SYMPOSIUM, JUNE 9-13, 1986 DIELECTRIC ENHANCEMENT DUE TO THE PRESENCE OF THIN GAS POCKETS R. J. tilght and A. Nur Department of Geophysics...

... water saturation salinity Symposium water-filled porosity dependence equation SPWLA TWENTY-SEVENTH ANNUAL LOGGING SYMPOSIUM, JUNE 9-13, 1986 -, ,- APPLICATIONS OF MICRO-WAVE DIELECTRIC MEASUREMENTS IN VARIOUS LOGGING ENVIRONMENTS E CHERUWER SCHLUMBERGER,LONDON J SUAU SCHLUMBERGER,MILANO ABSTRACT...

... ABSTRACT We have measured the dielectric constant of twelve sandstones as a function of saturation and frequency from 5 Hz to 13 MHz. The dielectric constant has been found to be strongly frequency dependent in saturated samples, decreasing with increasing frequency. The dielectric constant...

... ABSTRACT t shear has been determined by applying an iterative inversion method to the Stoneley wave in open holes. The Stoneley phase velocity depends not only on the formation shear modulus but also on other formation and borehole properties. Therefore, accurate shear velocity can...