A case study of the Solimoes basin and the Jurua sub-basin (Brazil) illustrates and confirms the principles of identifying oil and gas accumulation zones. The main principle of identifying an oil and gas accumulation zone is the uniformity of oil and gas system elements. The elements and processes of the oil and gas system of the Jurua sub-basin are briefly described: reservoirs and seals, source rock, source rock maturity and phase composition of hydrocarbons (HC), tectonics and hydrocarbon traps, HC migration and accumulation, preservation of deposits. The critical factors of naftidogenesis for the Jurua formation, which contains the bulk of hydrocarbon reserves, are the presence and location of hydrocarbon kitchens relative to traps; the degree of maturity; the presence of structural trends which are the main HC accumulators. Thus, in accordance with the accepted definition of an oil and gas accumulation zone in the Jurua interval, these are its connected parts, including, as a rule, groups of structural trends with the same source and phase composition of hydrocarbons; four oil and gas accumulation zones were distinguished in the considered target which differ by sources of hydrocarbons and types of HC fluids and traps. The results of 3D basin modeling is the basis for justifying the assessment of sediments maturity, type of fluids, volumes and migration pathways, and the charge potential of specific traps. The results can be used as a basis for planning further geological exploration in the Jurua sub-basin.
At the moment, basin modeling sets the tasks to assess the traps charge and, therefore, the local hydrocarbon resources within the proven zones of oil and gas accumulation. This is the area for further exploration efforts.
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