METHOD OF INTERPRETING INDUCTION LOGS IN HORIZONTAL WELLS

摘要

An induction logging tool (100) is used in an inclined borehole (10, 110, 410) for determining properties of subsurface formations away from the borehole. Measurements are made at a plurality of transmitter-receiver (T-R) (106-108F) distances. After correction (202) of the data for skin effects and optionally correcting (204) for eddy currents within the borehole, the shallow measurements (those from short T-R spacing or from high frequency data) are inverted to give a model (206) of the near borehole (invaded zone resistivity and diameter) and the resistivity of the formation outside the invaded zone. Using this model, a prediction (208) is made of the data measured by the mid-level and deep sensors (long T-R spacings).