Abstract: The present invention has, as a first object, an autonomous underwater vehicle equipped for the acquisition of the gravimetric and magnetic gradient near the seabed, characterized in that it comprises: —at least one gravimetric gradiometer; —at least one magnetic gradiometer. In particular, said autonomous equipped underwater vehicle allows underwater explorations as far as 3,000 m.

Abstract: A method for estimating fluid volumes moved in compartmented areas of the subsoil, the method including the steps of a) performing a series of gradiometric measurement campaigns at pre-established time intervals in a survey field, in which the relative variation ?Vi of the fluid volumes contained in a corresponding compartmented area of the subsoil is known; b) determining, for each measurement campaign after the first campaign, a parameter P1i based on the entire survey area; and c) determining a variability law that correlates the parameter P1i to the known relative variation ?Vi in fluid volumes in the compartmented area of the subsoil.

Abstract: The present invention relates to a method for estimating fluid volumes moved in compartmented areas of the subsoil, including steps which consist in effecting, in a survey field, a series of gradiometric measurement campaigns “for framing/calibrating the area” at pre-established time intervals, for each of which the relative variation ?Vi of the fluid volumes contained in a corresponding compartmented area of the subsoil is known; on the basis of the measurement effected, to calculate, for each measurement campaign “for framing/calibrating the area” subsequent to the former one, a parameter Pu correlated to the whole investigation area; on the basis of the known fluid volume variations ?Vi and the relative calculated parameter P1i, to determine by approximation a variability law which relates the parameter Pu with the volume variation of the fluids in the compartmented area, associated with any measurement campaign subsequent to those for framing/calibrating the area on the basis of the variability law determ