中国非常规天然气的战略地位

Strategic position of unconventional natural gas resources in China

中国严重依赖煤炭的畸形能源结构和世界非常规天然气的发展趋势,促使中国坚持常规和非常规天然气同时并重,共同推动天然气产业的快速发展,中国非常规天然气迎来了发展的良好机遇。中国非常规天然气资源雄厚,技术可采资源量达34×1012 m3,其中致密气最为现实,技术可采资源量达11×1012 m3,已在鄂尔多斯盆地苏里格气区大规模开发,其他主要盆地也有规模储量发现;煤层气技术可采资源量达12×1012 m3,经过多年的技术攻关,已在中国部分地区获得工业产能,具备规模开发的基本条件,可以加快发展;页岩气勘探开发刚刚起步,已经开展系统评价工作,稳定区海相页岩具有与美国类似的地质条件,是页岩气勘探的有利区,初步评估中国稳定区海相页岩中页岩气技术可采资源量约为7.5×1012 m3。建议如下:①增强致密气政策扶持力度,推进技术再进步,降低致密气经济下限;②完善煤层气开发关键技术,加快开发进程;③全面可靠评价页岩气、加快试验区建设、强化技术攻关,共同推动中国非常规天然气发展进程。预计经过20年左右的时间,中国非常规天然气产量将占天然气总产量的"半壁江山",随后继续发展,逐步成为中国天然气产量的主体和助推中国能源结构改善的生力军。

Under the present situation of abnormal energy structure in China with over dependence on coal and the developing trend of unconventional natural gas in the world,China has to put equal stress on the development of both conventional and unconventional natural gas resources to promote rapid progress in the natural gas industry.Unconventional natural gas resources in China are extremely rich with the recoverable reserves of 34 trillion m3.Among them,the tight gas is the most accessible with the recoverable reserves of 11 trillion m3,its commercial production has started in the Sulige gas zone,Ordos Basin,and in other major basins,commercial-scale tight gas reserves have also been discovered.The recoverable CBM gas reserves is 12 trillion m3,its commercial production has been achieved in some parts of China,and its rapid development will be possible under such favorable conditions.Comparatively,although shale gas development is at the initial step,its systematic evaluation has been made and the marine shale facies in the stable zone under such geological environment similar to the U.S.shales have great gas potential with the recoverable reserves of 7.5 trillion m3 from the preliminary assessment.Therefore,with the purpose of promoting the progress of unconventional natural gas in China,this paper suggests that(1) more preferential policies be formulated on tight gas development and the involved techniques be promoted to reduce its lower economic limit;(2) the key techniques of CBM gas exploitation be completed to speed up its development;and(3) shale gas resources be evaluated in a reliable and all-around way,the pilot test zones be quickly constructed,and technical difficulties be tackled.If so,it is predicted that after efforts made in the next two decades,the productivity of unconventional natural gas will account for a half of the total gas production,and along with its sustainable development,it will contribute a lot to the cumulative natural gas productivity and become the main force of stimulating the improvement of Chinese energy structure.