Patent ID: 6597993
Filing Date: 2003-07-22
Classification: G01V

Abstract:
A method for vertically deconvolving data received from a plurality of vertically deployed receivers to obtain data for a depth of interest, comprising:providing a transmitter and a plurality of receivers, said receivers being spaced at different distances from said transmitter; generating a signal from said transmitter and receiving it as a signal &sgr;a at each of said receivers; and for each receiver calculating a conductivity measurement using the equation Ïƒij&af;(z)=&Sum;j&it;&Sum;i&it;fij&it;Ïƒapj&af;(z-di),where the powers are pj=1, 3/2, 5/2, 7/2, 9/2 . . . , where z is vertical depth measured from the surface, di are a range of depth offsets spanning the depth of interest and are multiples of the depth increment, and the functions fij are calculated empirically using a linear least squares fit to find the coefficients that best match a set of target logs for at least two simulated logs at different resistivity levels.