Logging while drilling electrical imager and method for measurement in oil based mud

摘要

A method and apparatus for generating a borehole image by firing a signal in the direction of a borehole formation using at least one transmitter in a horizontal array, firing a signal in the direction of the borehole formation using at least one transmitter in a vertical array, where the fired signals engage the downhole formation, receiving signals associated with the transmitted signals after the fired signals have engaged the formation, and using the received signals to determine one or more vertical and horizontal formation parameters for generating an omni-directional image using the formation parameters.