Symulacje numeryczne odpowiedzi głębokościowej sondy NNTE w formacjach cienkowarstwowych nachylonych do osi odwiertu. Założenia i obliczenia wstępne metodą Monte Carlo

Abstract

Basic assumptions for calculation of well-logging profiles, expected from measurements of the neutron logging tools (type of NNTE) are presented. The report includes also results of the first tests and calculations. The NNTE tool responses were simulated using MCNP - the well-known Monte Carlo code. The general model consists of a huge rock, intersected by a borehole. A thin, flat rock layer of different lithology crosses that huge rock under an angle to the borehole. Numerous combinations of the model parameters - various porosities and neutron absorption cross-sections of the rocks as well as different layer thicknesses and angles - have been considered. The final results should be instantly useful for elaboration of the well-logging interpretation procedures for directional drillings, where the rock layers are usually sloped, or even highly inclined to the borehole axis.