1. A method of automatically evaluating similarity between a target geological region of interest and a plurality of known geological regions of interest, comprising: selecting a plurality of quantitative parameters describing reservoir characteristics of the target geological region of interest and defining a graphical target line based on values of the selected parameters; graphically constructing comparison lines for at least some of the plurality of known geological regions of interest, wherein respective comparison lines represent respective values of the quantitative parameters describing corresponding characteristics of respective regions among the known geological regions of interest; calculating, based on the plotted target and comparison lines, a similarity factor between each of the comparison lines and the target line; ranking the comparison lines based on the calculated similarity factors; and graphically displaying similarity factor versus similarity rank.