Traditionally, measurement-while-drilling (MWD) data are used primarily for geosteering purposes and drilling decisions such as monitoring of hole direction, deviation, and delineation of abnormally pressured zones. Wireline resistivity measurements, galvanic and induction, play a fundamental role in identifying and delineating oil- and gas-bearing formations. The availability of both MWD and wireline data at different times not only provides the interpreter with abundant information about subsurface formations but also poses a new challenge to generate a unique model(s) that better explains both data sets. Generally, MWD and wireline data are interpreted independently to estimate formation resistivities that may result in inconsistent earth models. In this study, we performed a joint inversion of MWD Multiple propagation resistivity (MPR), and wireline High Definition Induction log (HDIL) data to come up with an earth model that best explains both the data sets. An inversion strategy using a dual earth model, that describes the appropriate logging conditions of both wireline and MWD was also used in the inversion. Finally, the proposed algorithm was implemented on synthetic and the Gulf of Mexico data examples, and the results were compared with conventional MPR and HDIL processing results.

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