Abstract: A method for determining at least one of a mud density or a standoff, includes determining, a short-spaced density, a long-spaced density, and a time of sound propagation between a tool body and a borehole wall. The method also includes determining, based at least in part on the short-spaced density and the long-spaced density, a formation density using a spine-and-rib-diagram. The method further includes determining a distance-to-spine value based on the short-spaced density, the long-spaced density, and the formation density. The method includes determining a mud density approximation, based at least on the distance-to-spine value. The method also includes determining a standoff approximation, based at least on the mud density approximation. The method further includes determining, based at least on the mud density approximation and the standoff approximation, at least one of a computed mud density or a computed standoff.

Abstract: Methods for determining formation density of downhole formations include obtaining first density data (?SS) using a short-spaced detector configured to detect reflections of a signal transmitted into the downhole formation, obtaining second density data (?LS) using a long-spaced detector configured to detect reflections of the transmitted signal from the downhole formation, wherein the long-spaced detector is located a greater distance from a source than the short-spaced detector, and determining if a measured data point based on ?SS and ?LS falls within a unity area of a spine-and-rib plot. When the measured data point falls within the unity area, the formation density using a first mathematical relationship is determined and when the measured data point falls outside the unity area, the formation density using a second mathematical relationship different from the first mathematical relationship is determined.

Abstract: A method for determining at least one of a mud density or a standoff, includes determining, a short-spaced density, a long-spaced density, and a time of sound propagation between a tool body and a borehole wall. The method also includes determining, based at least in part on the short-spaced density and the long-spaced density, a formation density using a spine-and-rib-diagram. The method further includes determining a distance-to-spine value based on the short-spaced density, the long-spaced density, and the formation density. The method includes determining a mud density approximation, based at least on the distance-to-spine value. The method also includes determining a standoff approximation, based at least on the mud density approximation. The method further includes determining, based at least on the mud density approximation and the standoff approximation, at least one of a computed mud density or a computed standoff.