1. A computer-implemented method for analyzing a volume composed of voxels of seismic data representing a subsurface region for presence of a hydrocarbon system or a particular play, comprising: partitioning the seismic data volume to form a plurality of segments; computing a prospectivity score for each voxel, wherein at least two elements are selected, and for each element at least one seismic attribute is selected, and then an element score is calculated for each selected element based on the selected at least one seismic attribute, and the prospectivity score is formed by combining the element scores; ranking the plurality of segments for presence of a hydrocarbon system or the particular play based at least partly on the prospectivity scores for the voxels of seismic data in each segment; and wherein the elements are selected from a group consisting of reservoir, seal, trap, source, charge, overburden, maturation, migration, accumulation, and timing, or juxtaposition or coexistence of any two or more of them.