A computer-implemented method for refining estimated effects of geological parameters on seismic amplitudes for understanding a subsurface region of interest, the method being implemented in a computer system, the computer system including one or more physical computer processors and non-transient electronic storage, the method comprising: (a) obtaining ranges of parameter values for individual parameters within the subsurface region of interest, wherein a range of parameter values for a given parameter constrains parameter values as a function of position on, or around, a given feature of interest within a given subsurface region of interest, wherein the obtained ranges of parameter values are derived from actual data, the actual data including sensed seismic data and/or well data from the subsurface region of interest (b) generating a first model of the subsurface region of interest that defines the parameter values of the parameters as a function of position within the subsurface region of interest; (c) calculating a synthetic seismogram at angles of interest from the first model corresponding to a feature of interest within the subsurface region of interest to determine corresponding seismic amplitudes; (d) storing results of calculating the synthetic seismogram in an electronic storage; (e) repeating steps (b)-(d) for multiple additional models, wherein parameter values for a second model of the subsurface region of interest have different parameter values for the multiple parameters than the first model; (f) determining (212, 214) changes to the seismic amplitudes in response to changes to individual parameter values of the multiple models to give a resulting distribution which shows how a given parameter affects seismic amplitude as other parameters vary, to refine an estimated effect the parameters have on the corresponding seismic amplitudes and provide an improved understanding of interdependence between the individual parameters and effect the individual parameters have on the seismic amplitude; (g) generating a representation indicating the refined effect the parameters have on the corresponding seismic amplitudes; and (h) displaying, on a graphical user interface, the representation. (a) obtaining ranges of parameter values for individual parameters within the subsurface region of interest, wherein a range of parameter values for a given parameter constrains parameter values as a function of position on, or around, a given feature of interest within a given subsurface region of interest, wherein the obtained ranges of parameter values are derived from actual data, the actual data including sensed seismic data and/or well data from the subsurface region of interest (b) generating a first model of the subsurface region of interest that defines the parameter values of the parameters as a function of position within the subsurface region of interest; (c) calculating a synthetic seismogram at angles of interest from the first model corresponding to a feature of interest within the subsurface region of interest to determine corresponding seismic amplitudes; (d) storing results of calculating the synthetic seismogram in an electronic storage; (e) repeating steps (b)-(d) for multiple additional models, wherein parameter values for a second model of the subsurface region of interest have different parameter values for the multiple parameters than the first model; (f) determining (212, 214) changes to the seismic amplitudes in response to changes to individual parameter values of the multiple models to give a resulting distribution which shows how a given parameter affects seismic amplitude as other parameters vary, to refine an estimated effect the parameters have on the corresponding seismic amplitudes and provide an improved understanding of interdependence between the individual parameters and effect the individual parameters have on the seismic amplitude; (g) generating a representation indicating the refined effect the parameters have on the corresponding seismic amplitudes; and (h) displaying, on a graphical user interface, the representation.