| 主权项 |
1. A method for making a log of material properties in a plurality of beds from an instrument which produces an electromagnetic field while moving through a borehole producing data correlated to depth in said borehole, comprising:
utilizing at least one computer memory during the following steps wherein said data is produced by said instrument while moving through said borehole; estimating material properties for said plurality of beds; estimating positions for a plurality of bed boundaries; estimating orientations for said plurality of bed boundaries wherein said bed boundary orientations are individually variable; and utilizing said positions, said orientations, and said material properties to compute said log; wherein
estimating materials properties comprises receiving data representing measurement resulting from the electromagnetic field as a function of depth of the instrument in the borehole, andestimating said orientations comprises
for each of the plurality of bed boundaries, fitting at least one of a magnetic or electric dipole function to said data,adjusting the fit of said at least one for adjacent bed boundaries in order to minimize discontinuity of the fit of said at least one for the adjacent bed boundaries, andfor each of the plurality of bed boundaries, selecting a relative dipping angle dependent on the adjusted fit, to thereby vary estimates of said bed boundary orientations in a manner not constrained to be parallel, andutilizing comprises computing said log dependent on the selected relative dipping angle for each of the plurality of bed boundaries. |
