Abstract
Combined geologic and geochemical processing and interpretation of the materials on old oils has revealed factors determining their composition and properties and established main directions of change in these properties. The basic and most common factors determining regional patterns of change in composition of Vendian and Cambrian oils are depth of subsidence of the rocks, degree of catagenetic transformation of organic matter, and lithofacies conditions of their occurrence. For the region's sedimentary mantle it is shown that supergene processes, differentiation within the oil pool, and vertical flow have played subordinate parts in forming the physicochemical properties of the oils.
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