Patent ID: 6970397

Claim:
A method for determining a parameter of interest of a fluid in a subsurface region of earth formations comprising: (a) obtaining seismic survey information about the subsurface region; (b) identifying at least one seismic horizon of interest from the obtained survey information; (c) measuring at least one seismic attribute for the at least one horizon of interest at a plurality of locations, and obtaining a first probability density function (PDF) thereof; (d) defining a plurality of realizations of a model including at least one rock property in the region of interest; (e) defining at least one trial value of at least one property of said fluid and obtaining from said at least one trail value and said plurality of realizations of said model a second PDF associated with said at least one seismic attribute and said fluid property; and (f) determining from the first and second probability density functions said parameter of interest.