北极斯维尔德鲁普盆地含油气系统分析与资源潜力评价

Petroleum systems and resource potential in Sverdrup Basin, Arctic

李刚 胡靖靖 白国平 张凯逊 邱海华 王瑞丰

LI Gang HU Jingjing BAI Guoping ZHANG Kaixun QIU Haihua WANG Ruifeng

中国石油大学(北京) 地球科学学院, 北京 102249 中国石化 勘探分公司 勘探研究院, 成都 610041 中国地质科学院 地质力学研究所, 北京 100081 中国石油 塔里木油田分公司 勘探开发研究院, 新疆 库尔勒 841000 中国石油大学(北京) 地球物理学院, 北京 102249

College of Geoscience, China University of Petroleum (Beijing), Beijing 102249, China Research Institute of Exploration, SINOPEC Exploration Company, Chengdu, Sichuan 610041, China Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China Research Institute of Petroleum Exploration and Development, PetroChina Tarim Oilfield Company, Korla, Xinjiang 841000, China College of Geophysics, China University of Petroleum (Beijing), Beijing 102249, China

斯维尔德鲁普盆地(Sverdrup Basin)是北极地区重要的含油气盆地之一，具有丰富的油气资源，但勘探程度相对较低。基于IHS数据库和公开文献资料，分析了斯维尔德鲁普盆地油气地质特征及分布规律，划分了盆地内含油气系统和成藏组合；采用蒙特卡洛模拟法对盆地油气资源潜力进行了评估，并预测了有利勘探区带。盆地内绝大多数已发现油气藏分布于盆地西部，即萨宾(Sabine)次盆和爱丁堡(Edinburgh)次盆；油气主要富集于侏罗系和三叠系碎屑岩储层中。盆地内可划分出2个含油气系统，分别为古生界含油气系统和中生界含油气系统，后者的油气资源潜力远高于前者。后者待发现可采资源量均值为石油474.81 MMbbl (1 MMbbl=1×106 bbl，1 bbl=0.137 t)、天然气13 620.82 Bcf (1 Bcf=1×109 ft3，1 ft3=0.028 3 m3)、凝析油63.66 MMbbl，合计油当量2 808.61 MMboe (1 MMboe=1×106 bbl)，其中天然气可采资源量占盆地内待发现油气总可采资源量的80.82%。横跨盆地西部的下侏罗统构造型成藏组合、爱丁堡次盆的上三叠统—下侏罗统构造型成藏组合和萨宾次盆的上侏罗统构造型成藏组合是最有潜力的勘探区带。

The Sverdrup Basin is one of the important petroliferous basins in the Arctic. It has abundant oil and gas resources, but the exploration degree is relatively low. Based on the IHS database and literatures in the public domain, this paper documented the geological characteristics and distribution of oil and gas in the Sverdrup Basin, and classified the petroleum systems and hydrocarbon plays in the basin. The undiscovered hydrocarbons were eventually assessed by Monte Carlo simulation and the favorable exploration areas were predicted. The investigation results show that the discovered oil and gas accumulations are mainly distributed in the western area of the basin, which consists of Sabin and Edinburgh sub-basins. Oil and gas are mainly reserved in the Jurassic and Triassic clastic reservoirs. Two petroleum systems, which are the Paleozoic and Mesozoic systems, were identified in the basin. The Mesozoic petroleum system has a far greater exploration potential. Undiscovered recoverable reserves (mean value) in the Mesozoic petroleum system are 474.81 MMbbl (1 MMbbl=1×106 bbl, 1 bbl=0.137 t) of oil, 13 620.82 Bcf (1 Bcf=1×109 ft3, 1 ft3=0.028 3 m3) of natural gas and 63.66 MMbbl of condensate, amounting to 2 808.61 MMboe (3.85×108 t), of which the natural gas accounts for 80.82%. The Lower Jurassic structural hydrocarbon play in the western area of the basin, the Upper Triassic-Lower Jurassic structural hydrocarbon play in the Edinburgh sub-basin and the Upper Jurassic structural hydrocarbon play in the Sabine sub-basin are the most promising exploration areas.

国家自然科学基金 91755104;中国地质调查局地质调查项目 DD20221810

https://doi.org/10.11781/sysydz202303474