GRAVITY LINEAR INVERSION AND DENSITY STRUCTURE ACROSS THE BRAZILIAN EQUATORIAL MARGIN: EQUANT PROJECT

The technique commonly used in interpreting gravity data consists of solutions of the forward problem, where an acceptable fit to the observed data is obtained by trial of several density distribution models. The forward problem in gravity, despite its simplicity, doe's not provide objective parameters to measure confidence in the estimates. One advantage of the inverse problem is its ability to assess the uncertainty in solutions and their sensitivity to the presence of noise in the data. Although seismic methods provide "unique" solutions in resolving structural details, particularly in the shallow subsurface, gravity methods may be valuable in defining the lithology of some structures, even in advanced stages of exploration.