Classification and Resource Evaluation of the Hydrocarbon Plays in the North Slope Basin, Alaska

doi:10.19657/j.geoscience.1000-8527.2023.079

Abstract

Abstract:

The North Slope basin in Alaska is one of the basins with the most prosperous hydrocarbon exploration potential in the world.Scientific research on this basin will improve the understanding of the oil and gas exploration 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 petroleum systems and plays in the basin.Plays were used as an assessment unit to evaluate the undiscovered petroleum 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 structure 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 recoverable 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.

Key words: Alaska, hydrocarbon accumulation element, play, resource assessment, favorable play fairway

CLC Number:

P62
P618.13

LI Gang, MENG Qiuhan, ZHANG Kaixun, BAI Guoping, HU Jingjing, QIU Haihua, CHEN Jun. Classification and Resource Evaluation of the Hydrocarbon Plays in the North Slope Basin, Alaska[J]. Geoscience, 2024, 38(02): 322-334.

Figures/Tables 12

References 36

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构造单元	石油 (MMbbl)	天然气 (Bcf)	凝析油 (MMbbl)	油当量 (MMboe)	占总储量比例(%)
巴罗穹隆	25305.6	40848.9	267.0	32380.8	77.3
科尔维尔前渊带	0	1344.0	3.2	227.2	0.5
迪库姆地堑	350.0	350.0	0	408.3	1.0
鱼溪台地	3443.5	7460.3	16.9	4703.8	11.2
汉娜海槽	0	14000.0	624.0	2957.3	7.1
米迪穹隆	0	290.0	0	48.3	0.1
北部斜坡带	0	5.0	0	0.8	0
乌米亚特次盆	220.0	838.0	1.3	360.9	0.9
合计	29319.1	65136.2	912.4	41087.5	98.1

构造单元	石油 (MMbbl)	天然气 (Bcf)	凝析油 (MMbbl)	油当量 (MMboe)	占总储量比例(%)
巴罗穹隆	25305.6	40848.9	267.0	32380.8	77.3
科尔维尔前渊带	0	1344.0	3.2	227.2	0.5
迪库姆地堑	350.0	350.0	0	408.3	1.0
鱼溪台地	3443.5	7460.3	16.9	4703.8	11.2
汉娜海槽	0	14000.0	624.0	2957.3	7.1
米迪穹隆	0	290.0	0	48.3	0.1
北部斜坡带	0	5.0	0	0.8	0
乌米亚特次盆	220.0	838.0	1.3	360.9	0.9
合计	29319.1	65136.2	912.4	41087.5	98.1

含油气系统	石油 (MMbbl)	天然气 (Bcf)	凝析油 (MMbbl)	油当量 (MMboe)	占总油当量比例(%)
新生界含油气系统	350.0	350.0	0	408.3	1.0
中生界复合含油气系统	29388.2	66403.6	981.3	41436.8	98.9
石炭系含油气系统	0	237.9	0	39.7	0.1
总计	29738.2	66991.5	981.3	41884.7	100

含油气系统	石油 (MMbbl)	天然气 (Bcf)	凝析油 (MMbbl)	油当量 (MMboe)	占总油当量比例(%)
新生界含油气系统	350.0	350.0	0	408.3	1.0
中生界复合含油气系统	29388.2	66403.6	981.3	41436.8	98.9
石炭系含油气系统	0	237.9	0	39.7	0.1
总计	29738.2	66991.5	981.3	41884.7	100

含油气系统	成藏组合	油气藏(个)	石油(MMbbl)	天然气(Bcf)	凝析油 (MMbbl)	油当量(MMboe)
中生界复合含油气系统	古近系—新近系	4	390.0	365.0	0.8	451.6
	白垩系	69	11379.9	35171.7	936.5	18178.4
	侏罗系	9	1974.0	2162.0	10.0	2344.3
	三叠系	19	14819.2	27725.9	6.0	19446.1
	石炭系	4	825.1	979.0	28.0	1016.3
合计		105	29388.2	66403.6	981.3	41436.8