1.
n. [Formation Evaluation]
An algorithm for correcting the effects of
dip or
borehole deviation on the response of a
logging measurement. These effects are significant for deep-reading logs such as
induction and electrode devices. The standard
processing used to produce these logs assumes a vertical well with horizontal
formation layers. In the presence of a relative dip between the borehole and formation layers, the logs may read incorrectly. For older logs such as the dual induction, a set of
inverse filters can be designed to correct for dip effect up to about 60. For modern
array logs, iterative
forward modeling with a one-dimensional layered earth
model can correct up to about 85.