Tool for azimuthal resistivity measurement and bed boundary detection

摘要

Systems and methods for performing bed boundary detection and azimuthal resistivity logging with a single tool are disclosed. Some method embodiments include logging a borehole with an azimuthally-sensitive resistivity logging tool; deriving both a resistivity log and a boundary detection signal from measurements provided by said tool; and displaying at least one of the boundary detection signal and the resistivity log. The resistivity log measurements may be compensated logs, i.e., logs derived from measurements by one or more symmetric transmitter-receiver arrangements. Though symmetric arrangements can also serve as the basis for the boundary detection signal, a greater depth of investigation can be obtained with an asymmetric arrangement. Hence the boundary detection signal may be uncompensated.

主权项

1. A logging method that comprises:
logging a borehole with an azimuthally-sensitive resistivity logging tool; deriving a boundary detection signal from an azimuthal dependence of measurements provided by said tool; deriving a resistivity log from measurements provided by said tool; and displaying at least one of the boundary detection signal and the resistivity log.