西巴伦支海盆地含油气系统分析与资源评价

北极西巴伦支海盆地是全球最具勘探潜力的含油气盆地之一。基于IHS数据库最新资料，分析了该盆地油气地质特征，揭示了盆地油气分布特征，划分了含油气系统和成藏组合，评估了盆地资源潜力，并优选了有利勘探区带。研究表明，区域上西巴伦支海盆地已发现油气藏主要分布于盆地的西南部；层系上油气主要富集于侏罗系和三叠系储层，其已发现控制和探明(2P)可采储量分别占盆地总2P可采储量的72.6%和15.5%。盆地内主要发育2个已知的含油气系统，分别为侏罗系/三叠系复合含油气系统和二叠系/石炭系复合含油气系统。蒙特卡洛模拟评估出西巴伦支海盆地石油、天然气和凝析油待发现可采资源量(均值)分别为487.4×106 t、1375.6×109 m3和84.6×106 t，折合成油当量为1681.9×106 t，其中天然气占66.0%。综合资源评价结果和油气成藏条件地质分析优选出2个有利勘探区带，分别是盆地南部的侏罗系成藏组合有利勘探区带和三叠系成藏组合有利勘探区带。

Analysis of petroleum systems and assessment of petroleum resources in the West Barents Sea Basin,Arctic

The West Barents Sea Basin in the Arctic is one of the most promising petroleum basins in the world. With the latest data from the IHS database, this study investigated the petroleum geology of the basin, documented the distribution characteristics of petroleum resources, systematically analyzed the petroleum systems and plays, evaluated the resource potential, and predicted the favorable exploration fairways in the West Barents Sea Basin. The results show that regionally, discovered oil and gas accumulations are mainly distributed in the southwest area of the basin; stratigraphically, oil and gas reserves are mainly confined to the Jurassic and Triassic reservoirs, which host 72.6% and 15.5% of the total proved and probable reserves, respectively. The basin has two known petroleum systems: the Jurassic/Triassic composite petroleum system and the Permian/Carboniferous composite petroleum system. The resource evaluation by the Monte Carlo statistical methodology indicates that the means of undiscovered resources in the West Barents Sea Basin are 487.4×106 t of oil, 1375.6×109 m3 of gas, and 84.6×106 t of condensate, amounting to 1681.9×106 t, of which the gas accounts for 66.0%. Based on the results of resource evaluation and comprehensive analysis of petroleum geology, two favorable exploration fairways were selected: the favorable exploration zone of the Jurassic play and the favorable exploration zone of the Triassic play in the southern area of the basin.