GRAVITY DUE TO A BODY WITH ROTATIONAL SYMMETRY ABOUT A VERTICAL AXIS

Mass distributions encountered in gravity modeling are sometimes approximately symmetrical about a vertical axis. Examples include salt domes and other types of piercement structures, fluid behavior surrounding an injection or pumping well, formation damage and mudcake surrounding a drillhole, natural impact craters, human induced craters and underground explosions, and some volcanic and intrusive structures. Occasionally, gravity surveys are conducted in boreholes or vertical shafts that may or may not coincide with the axis of symmetry. The formulations presented here are useful for the interpretation of such gravity surveys.