阿拉斯加北坡盆地成藏组合划分与资源潜力评价OA北大核心CSTPCD

The North Slope basin in Alaska is one of the basins with the most prosperous hydrocarbon explora-tion potential in the world.Scientific research on this basin will improve the understanding of the oil and gas ex-ploration in the Arctic and is significant for the formulation of energy strategy in this region.Based on the latest available data from IHS Markit and a comprehensive investigation of petroleum geology,we characterized the pe-troleum systems and plays in the basin.Plays were used as an assessment unit to evaluate the undiscovered pe-troleum resources in the basin and then the favorable exploration play fairways were delineated.The results show that hydrocarbon accumulations in the North Slope Basin have been found mainly in the Barrow Arch struc-ture unit where 77.3％of the total discovered resources occur.Discovered oil and gas resources were mainly reserved in Cretaceous and Triassic,hosting 44.0％and 45.8％of the total oil and gas reserves,respectively.The basin mainly develops the Mesozoic composite petroleum system,the Cenozoic petroleum system,and the Carboniferous petroleum system.The Mesozoic composite petroleum system can be divided into five plays,as Paleogene-Neogene,Cretaceous,Jurassic,Triassic,and Carboniferous plays.The average undiscovered recov-erable resources estimated by using the Monte Carlo simulation were 36,943.8 MMbbl of oil,79,711.6 Bcf of natural gas,and 262.1 MMbbl of condensate,totaling 50,491.2 MMboe,of which 73.1％are oil,26.3％natural gas,and 0.6％condensate.Therefore,the two first class of favorable exploration play fairways and four secondary category of favorable exploration play fairways were targeted in this study.