Abstract: A method of estimating a geology of an earth formation includes: receiving gravity measurements from each of a plurality of gravity sensors nsj arrayed along a length of a borehole in an earth formation, each of the sensors nsj generating a gravity measurement gj associated with a location zsj, each of the plurality of sensors separated by a distance h; generating a model of the earth formation that includes approximate geological boundaries Nm having an approximate depth zmk, the geological boundaries defining a number of geologic layers therebetween; assuming that each geological boundary is represented by a minimum density change and each of the geologic layers has a thickness that encompasses two or more of the plurality of sensors nsj; and estimating a location and a density change ?? of a geologic boundary z between locations zsj and zsj+1 based on the gravity measurements gj and the distance h.

Abstract: A method of estimating a geology of an earth formation includes: receiving gravity measurements from each of a plurality of gravity sensors nsj arrayed along a length of a borehole in an earth formation, each of the sensors nsj generating a gravity measurement gj associated with a location zsj, each of the plurality of sensors separated by a distance h; generating a model of the earth formation that includes approximate geological boundaries Nm having an approximate depth zmk, the geological boundaries defining a number of geologic layers therebetween; assuming that each geological boundary is represented by a minimum density change and each of the geologic layers has a thickness that encompasses two or more of the plurality of sensors nsj; and estimating a location and a density change ?? of a geologic boundary z between locations zsj and zsj+1 based on the gravity measurements gj and the distance h.