Monte Carlo Analysis of Rugosity Effects on gamma-gamma Logs. Final Report

摘要

The model developed for the Monte Carlo method represents the borehole rugosity surface as a sine wave in cross section in which the amplitude, phase, and wavelength are adjustable parameters. The rugosity surface defines the interface between the formation and the drilling mud or borehole fluid. To compute efficiently the effects of rugosity, the fictitious cross section technique (delta-scattering method). The use of the last-flight, flux-at-a-point estimator with delta-scattering required a new mathematical form, which was developed. The rugosity model also uses correlated sampling. The checkout process for changing MORSE into delta-scattering program is described, and results of two sets of correlated rugosity calculations are discussed.