1. A method of 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; defining a target line based on values of the selected parameters; 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 target and comparison lines, a similarity factor for each of the comparison lines; ranking each of the comparison lines based on the calculated similarity factor; and determining, based on the similarity factor and ranking, a closeness of match between the target geological region of interest and the known geological regions of interest.