Abstract
Based on the tectonic evolution and depositional characteristics of Central-West African Rift System and regional geologic background, the characteristics of oil and gas accumulation in the Termit rift superimposed basin were examined, and the factors controlling oil and gas accumulation were discussed. The Termit basin is a rift superimposed basin formed by two stages of rifting int the early Cretaceous and Paleogene, where the Yogou formation marine source rock is widespread. The two sets of reservoirs, the first member of Paleogene Sokor Formation and the Cretaceous Yogou Formation, dominated by quartz sandstone, have relatively good porosity-permeability characteristics. It is found that fault pattern and oil and gas migration pattern control the oil and gas accumulation patterns in the basin, the development of faults is the precondition for hydrocarbon to migrate from Upper Cretaceous to Palaeogene for accumulation, including “Y-shaped” hydrocarbon migration and accumulation, “muti-step” vertical hydrocarbon migration and the “composite” hydrocarbon migration. Hydrocarbon enrichment in this basin was controlled by tectonic evolution of rift basin, that is, fault belts formed during the two stages of rifting controlled the horizontal distribution of oil and gas, while favorable reservoir-caprock assemblages in the sequences formed in the late rifting stage controlled the vertical hydrocarbon enrichment.
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