In this paper we discuss (1) abundance ratios of some isomers of lighter hydrocarbons that would characterize the Minami-Aga crude oil, and (2) n-heptane-2 methylhexane-3 methylhexane relationship as viewed from the crude oil evolution. At first we deal with the subject (1). In general , the abundance ratios of hydrocarbon isomers, which could characterize the crude oil from a reservoir and may have been kept almost constant during the time of secondary migration and accumulation of the crude

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... l, must satisfy at least the three following conditions. a) The boiling points of the hydrocarbon isomers are nearly equal.