Analysis of petroleum systems and assessment of petroleum resources in the West Barents Sea Basin, Arctic
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摘要:
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。
Abstract: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.
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Key words:
- West Barents Sea Basin /
- petroleum system /
- play /
- resource assessment /
- favorable play fairways
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图 1 西巴伦支海盆地构造分区图(据Norwegian Petroleum Directorate, 2019修改)
Figure 1. Structural subdivision of the West Barents Sea Basin (modified from Norwegian Petroleum Directorate, 2019)
图 2 西巴伦支海盆地南部区域构造剖面示意图(据Colpaert et al., 2007修改; 剖面位置见图 1中A-A′)
Figure 2. Schematic geological cross-section of the southern West Barents Sea Basin (modified from Colpaert et al., 2007; The positon of the cross-section is shown as A-A′ in Fig. 1)
图 3 西巴伦支海盆地已发现油气2P可采储量分布
a—西巴伦支海盆地主要构造单元中已发现油气2P可采储量分布；b—西巴伦支海盆地不同埋深下已发现油气2P可采储量分布；c—西巴伦支海盆地不同储集层中已发现油气2P可采储量分布；d—西巴伦支海盆地不同圈闭中已发现油气2P可采储量分布
Figure 3. Distribution of proved and probable reserves in the West Barents Sea Basin
(a) Distribution of proved and probable reserves in the main tectonic units of the West Barents Sea Basin; (b) Distribution of proved and probable reserves at different burial depths in the West Barents Sea Basin; (c) Distribution of proved and probable reserves in different reservoirs in the West Barents Sea Basin; (d) Distribution of proved and probable reserves in different traps in the West Barents Sea Basin
图 4 西巴伦支海盆地油气田分布和烃源岩展布图(据IHS Energy Group, 2020修改)
Figure 4. Distribution of oil and gas fields and source rocks in the West Barents Sea Basin (modified from IHS Energy Group, 2020)
图 5 西巴伦支海盆地综合地层柱状图(据IHS Energy Group, 2020修改)
Figure 5. Integrated stratigraphic chart of the West Barents Sea Basin (modified from IHS Energy Group, 2020)
图 6 西巴伦支海盆地侏罗系/三叠系复合含油气系统内成藏组合展布图
Figure 6. Plays of the Jurassic/Triassic composite petroleum system in the West Barents Sea Basin
图 7 西巴伦支海盆地二叠系/石炭系复合含油气系统成藏组合展布图
Figure 7. Plays of the Permian/Carboniferous composite petroleum system in the West Barents Sea Basin
图 8 西巴伦支海盆地待发现油气可采资源量评价结果类比图
Figure 8. Comparison of assessment results of undiscovered oil and gas resources in the West Barents Sea Basin
表 1 西巴伦支海盆地成藏组合控制与探明可采储量一览表
Table 1. Proved and probable reserves of different plays in the West Barents Sea Basin
含油气系统 成藏组合 油气藏数/个 石油/ ×106 t 天然气/ ×109 m3 凝析油/ ×106 t 油当量/ ×106 t 占总2P可采储量比例/% 平均规模/ ×106 t 侏罗系/三叠系复合含油气系统 白垩系成藏组合 8 4.8 26.1 0.5 26.4 4.4 3.3 侏罗系成藏组合 40 157.3 295.6 27.0 422.7 71.1 10.6 三叠系成藏组合 25 32.2 63.7 3.5 87.1 14.6 3.5 二叠系/石炭系复合含油气系统 侏罗系/三叠系成藏组合 9 22.5 26.9 0.4 44.6 7.5 5.0 二叠系/石炭系成藏组合 5 7.9 7.5 0.1 14.1 2.4 2.8 上古生界/中生界复合含油气系统 0 0 0 0 0 0.0 0 总计 87 224.7 419.8 31.5 594.9 100.0 6.8 
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表 2 西巴伦支海盆地待发现油气可采资源量评价结果汇总表
Table 2. Assessment results of undiscovered oil and gas resources in the West Barents Sea Basin
资评结果 上古生界/中生界含油气系统 侏罗系/三叠系含油气系统 二叠系/石炭系含油气系统 合计 白垩系 侏罗系 三叠系 侏罗系/三叠系 二叠系/石炭系 石油/×106 t F5 48.7 2.3 126.6 26.7 9.4 7.2 220.8 F50 101.0 6.5 261.7 55.7 23.9 16.7 465.4 F95 175.2 14.6 444.7 103.5 53.4 29.2 820.5 均值 105.3 7.2 271.7 59.3 26.7 17.2 487.4 天然气/×109 m3 F5 111.7 156.0 343.8 105.7 34.4 18.5 646.3 F50 231.6 72.4 657.4 207.9 89.2 51.3 1309.8 F95 401.9 141.6 1165.5 326.7 171.0 105.8 2312.5 均值 241.6 78.1 694.6 211.2 94.7 55.4 1375.6 凝析油/×106 t F5 7.2 0.6 7.0 4.0 0.7 0.1 19.6 F50 14.9 2.6 29.8 21.8 3.0 0.6 72.7 F95 25.8 7.5 82.8 62.7 8.9 1.7 189.5 均值 15.5 3.1 35.5 26.0 3.7 0.7 84.6 油当量/×106 t F5 145.9 28.9 411.0 116.0 37.8 22.2 761.8 F50 302.7 67.5 821.9 245.3 98.9 58.6 1594.9 F95 525.2 136.4 1467.8 429.8 200.2 116.3 2875.8 均值 315.8 73.3 867.7 255.7 106.7 62.7 1681.9
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