Abstract
The influence of geological and geochemical factors on the properties of oils saturating combined traps in various oil and gas basins is analyzed. A way is developed for predicting the properties of fluids (physicochemical, hydrocarbon and trace element compositions), as well as the phase state of accumulations in traps of various structures in connection with the vertical scale of oil and gas formation. The evaluation of the search criteria for their identification, analysis and systematization of ideas about the influence of various geological and geochemical factors on the formation and oil and gas content of megareservoirs is carried out. Of great importance is the possibility of assessing the productivity of shale formations and the selection of “sweet spots” by geochemical methods.
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