... alteration of the formation velocity. A dispersion analysis is then applied to the measured data to estimate and to correct for the dispersion effect. The measured dispersion can also be compared with theoretical modeling to assess the possible formation alteration. Field data examples demonstrate...

... Upstream Oil & Gas frequency borehole frequency transmitter log analysis Dispersion Correction receiver geophysics transmitter Symposium semblance plot algorithm dual-frequency lwd sonic tool expand well logging phase velocity unipolar transmitter technology dispersion effect...

... proportional to the frequency of the measuring current. A previous paper concluded that dispersion effects in theory should be observable between the resistivity measurements of 2-MHz LWD and 20-KHz wireline tools, but the effect in actual well log data could not be conclusively demonstrated. There are several...

... several major influences on the LWD quadrupole wave measurement. These influences include dispersion effect and its controlling factors, noise contamination, tool eccentering, formation type (fast or slow), and formation anisotropy. We use theoretical/numerical modeling results to analyze and understand...