新疆地区页岩油气资源潜力及勘探方向

新疆地区发育多套富有机质页岩, 是我国页岩油气勘探开发应重点关注的地区之一。调研发现, 新疆地区发育的34个沉积盆地中有6个盆地具备一定页岩油气资源潜力。针对新疆地区缺乏系统性页岩油气资源评价的现状, 系统梳理了新疆地区页岩油气勘探开发进展, 总结了古生界至中生界页岩油气地质特征, 采用概率体积法对新疆地区准噶尔盆地、焉耆盆地、吐哈盆地、塔里木盆地、伊犁盆地和三塘湖盆地的寒武系、奥陶系、石炭系、二叠系、三叠系、侏罗系开展了页岩油气选区和资源评价工作, 优选出5个页岩油远景区和23个页岩气远景区, 远景区资源潜力分别为650.19×10⁸ t和32.13×10¹² m³; 优选出6个页岩油有利区和6个页岩气有利区, 有利区资源潜力分别为70.06×10⁸ t和2.30×10¹² m³。根据计算的页岩油气资源分级评价结果和现阶段的勘探开发现状, 提出了新疆地区页岩油气下一步勘探方向, 认为准噶尔盆地和三塘湖盆地的二叠系页岩油是未来页岩油增储上产的领域, 博格达山前的二叠系页岩油伴生的页岩气以及多层系页岩气分布地区是未来页岩气勘探的重要方向。

Xinjiang with multi-package organic-rich shales is among the key regions for shale oil and gas exploration and development in China.Among 34 sedimentary basins in Xinjiang, 6 basins were evaluated to have potential shale oil and gas resources; however, systematic resources assessment has as yet not been performed.This paper systematically reviews the progress of shale oil and gas exploration and development in Xinjiang, and summarizes the geological characteristics of shale oil and gas in the Paleozoic and Mesozoic Erathems.In terms of prospect optimization and resources assessment by using the probabilistic volumetric method for shale oil and gas in the Cambrian, Ordovician, Carboniferous, Permian, Triassic and Jurassic Systems in the Junggar, Yanqi, Tuha, Tarim, Yili and Santanghu Basins in Xinjiang, there are 5 shale oil prospect areas and 23 shale gas prospect areas, with potential resources of 650.19×10⁸ t and 32.13×10¹² m³, respectively.There are six favorable areas for shale oil exploration and six favorable areas for shale gas exploration, with potential resources of 70.06×10⁸ t and 2.30×10¹² m³, respectively.According to hierarchical evaluation results and the present situation of exploration and development, it is suggested that the Permian System in the Junggar and Santanghu Basins may contribute to shale oil reserves and production increase, and shale gas exploration may concentrate on the Permian system in the piedmont zone of the Bogda Mountain, where there is shale gas associated with shale oil, and additional areas with multi-layer shale gas distribution.