Patent ID: 11885925
Assignee: HALLIBURTON ENERGY SERVICES, INC.
Field: Civil engineering (Other fields)
Classification: CPC E  G | IPC E  G

Claim 10:
11. A method of evaluating a subterranean earth formation, comprising:
inserting a logging tool comprising a transmitter antenna and a receiver antenna within a wellbore intersecting the subterranean earth formation;
controlling a current and a voltage sourced to a transmitter antenna, causing the transmitter antenna to transmit a first electromagnetic signal into the subterranean earth formation at a plurality of depths along the wellbore;
receiving, via the receiver antenna, a plurality of second electromagnetic signals at the plurality of depths along the wellbore intersecting the subterranean earth formation, wherein each of the plurality of second electromagnetic signals is emitted by the subterranean earth formation in response to the first electromagnetic signal as the receiver antenna traverses the plurality of depths along the wellbore intersecting in the subterranean earth formation;
calculating a plurality of resistivity values for the plurality of second electromagnetic signals;
calculating a plurality of solutions to an inversion algorithm, wherein each of the plurality of solutions comprises a solution resistivity measurement as a function of the plurality of depths along the wellbore;
filtering the plurality of solutions according to a filter threshold value into a plurality of convergent solutions;
pixilating each of the convergent solutions of the plurality of convergent solutions into a pixelated convergent solution, thereby forming a plurality of pixilated convergent solutions;
calculating one or more ensemble statistics of the plurality of pixilated convergent solutions;
calculating a difference in resistivity value between successive pixels in each of the pixelated convergent solutions of the plurality of pixilated convergent solutions along the plurality of depths along the wellbore;
identifying one or more presumptive layer boundaries based on the differences in resistivity values between the successive pixels;
calculating one or more composite resistivity statistics of the plurality of pixilated convergent solutions based at least in part on the one or more presumptive layer boundaries and the one or more ensemble statistics;
generating a formation model based on the one or more composite resistivity statistics; and
directing, by a user, a drill bit position and orientation within the subterranean earth formation based on the formation model.