METHOD FOR CORRECTION OF RESISTIVITY LOGGING DIAGRAM Russian patent published in 2003 - IPC

FIELD: method for logging of electric resistivity of geological formation enveloping the borehole filled with fluid. SUBSTANCE: functioning of the resistivity logging instrument is accomplished in the borehole so as to obtain a certain totality of resistivity logging diagrams (FLG₁,FLG₂,...,FLG_n) of geological formation for different radial intervals 1. ..n relative to the borehole. A modeled profile of resistivity (Rmod_k) is selected for each radial interval k. Modeled profiles of resistivity (Rmod₁,Rmod₂,...,Rmod_n) are introduced in the logging instrument simulator so as to obtain modeled logging diagrams for each radial interval k. Modeled profiles of resistivity (Rmod ) are introduced in the logging instrument simulator so as to obtain modeled logging diagrams for each radial interval k, having a test depth corresponding to the radial interval k. The modeled profile of resistivity (FLG_k) is corrected for each radial interval k, depending on the observed deviation of resistivity logging (MLK_k) from the modeled resistivity logging diagram. The operations are repeated until the difference between the resistivity logging diagram (FLG_k) and the respective modeled resistivity logging diagram for each radial interval k is below the selected threshold value. EFFECT: enhanced efficiency. 6 cl, 2 dwg