Abstract
The paper summarizes geochemical data on changes in the organic and inorganic characteristics of naphthoids during their secondary transformation. The hypergenesis phenomena are exemplified with data for oil-and-gas basins of Brazil, Nigeria, and Russia (Sakhalin Island). These are continental-margin basins, in which the original organic matter (OM) is of the mixed coastal-marine and terrigenous origin with a low transformation ratio. The oils are characterized by depleted concentrations of trace elements and nickel metallogeny (Ni/V > 1). By the example of these three basins, the criteria of hypergenetically altered naphthoids have been revealed that make it possible to predict the quality of fluids in such basins upon hypergenetic trans-formation.
Published Version
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