BKZRt (Lateral Log Interpretation & Borehole Corrections)
The program consists of two modules: Lat-Rt and BKZRt. Lat-Rt is used to automatically and/or interactively define bed boundaries using any user defined curve, and interpret the Rta from lateral log curve based on AO spacing and bed thickness relationships. BKZ-Rt uses the output of Lat-Rt, with up to six interpreted lateral log (Ra) curves, hole diameter (Dh) and mud resistivity (Rm), to compute true deep resistivity (Rt), invaded zone resistivity (Rxo), and diameter of invasion (Di). Each module uses ASCII or LAS files as input. The BKZ-Rt program suite was developed specifically for the interpretation of Russian Lateral Logs, although it is applicable to any Lateral Resistivity logs. The program includes chart look-ups for Russian lateral log charts for differing Rxo/Rm and Di/Dh ratios. The BKZRt program finds the best fit chart for each bed's invasion profile. Additional charts can be digitized and can be added to the chart set. Lateral log values and AO spacings from multiple tools are used to determine the proper Rxo/Rm and Di/Dh chart, and the program calculates the degree of fit to the chart. The average Rt, Rxo, Di, chart used, number of curves that fit that chart within specified parameters, the Rt values calculated for each tool, and a depth filtered average Rt are output for each depth.