Increased sulfur content, condensation, and amount of vanadium (V > Ni) observed in real crude oil systems are explained from the standpoint of formation of abiogenous constituents of crude oil systems, which is a part of the overall process of oxidative transformations of endogenous fluids as they move toward the earth's surface and is caused by oxidative dehydrocondensation effect on the hydrocarbon component of elemental sulfur S0 present in the fluids. These mechanisms arise from oxidation of deep-earth (plutonic) hydrogen sulfide to S-0 and SO (4) (2-) due to intensification of oxidative conditions in the process of ascending movement of the fluid and acceleration of oxidative processes by vanadium present in the system.