Abstract
Relevance of research is associated with the national task to increase the hydrocarbon reserves based on innovative technique of interpreting old GIS data. The goal of the research is to demonstrate the value of data on the second- ary processes (pyritization and kaolinitization), their intensities in the sand intervals calculated using GIS information. The geochemical criteria of hydrocarbon accumulation and their cutoff values are selected for Tomsk Region. The research is based on the results of formation test using well historical data as well as innovative statistical interpretation of well logging to reveal low-resistivity hydrocarbon saturated formations and intensities of the secondary geochemical processes. Results of statistical interpretation of GIS information are presented for tested hydrocarbon-saturated and water-saturated sand intervals (wells of Tomsk Region and Samotlor oil field) where the search criteria of aban- doned hydrocarbon deposit are defined. The study outlines a mathemati- cal tool to estimate the perspective of redeveloping abandoned hydrocar- bon fields based on the results of GIS information interpretation. Conclusion The intensity of secondary processes is an indicator of hydrocarbons and may serve as a criterion of their presence. Cutoff values of empirically determined geochemical criteria can change depending on the research area. Paragenesis of the superimposed processes of pyritization and kao- linitization in the sand intervals has shown their hydrocarbon saturation. Application of multiplicative intensity parameter of such epigenetic pro- cesses as pyritization, kaolinitization, and carbonization in Jurassic for- mations allows for study in saturation of Paleozoic formation.
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