川渝地区相国寺地下储气库库址选择

Site selection for underground gas storage rebuilt on the depleted Xiangguosi Carboniferous gas reservoirs in Sichuan and Chongqing areas

为确保川渝地区天然气季节性调峰和供气的安全性,充分发挥"中卫—贵阳联络线"管道系统的输气能力,迫切需要建设配套的地下储气库。川渝地区处于"中卫—贵阳联络线"中段,天然气需求旺盛,天然气资源较丰富,因天然气开发历史长,具有多个可用于建设地下储气库的枯竭性气藏。在借鉴和对比国内外地下储气库库址选择方法和建库经验的基础上,提出了适合川渝地区地下储气库库址优选的标准:地理位置优越、地质条件符合建库要求、注采能力和库容满足应急与调峰需要以及储气库气源有保障等。利用该标准对现有的几个气藏进行了筛选,其中相国寺气田石炭系枯竭气藏建设地下储气库地质上具有完整性,气库功能和气库库址具有明显优势,进而分析了用其建库的可行性;最后对相国寺地下储气库进行了初步规划设计。

To ensure the security in gas supply and seasonal peak-shaving in Sichuan and Chongqing areas,it is urgent to construct underground gas storage to fully employ the Zhongwei-Guiyang tie-line in gas pipeline systems.In the middle of this tie-line,the Sichuan and Chonqging areas have rich gas resources and gas demand there is rapidly increasing.Due to a long history of gas exploration in these areas,many depleted gas reservoirs can be selected as favorable sites for underground storage.Through comparison analysis of storage site selective methods and experiences from home and abroad,this paper presents the criteria of the site selective preference adaptable for underground gas storage in the Sichuan and Chongqing areas,i.e.,good geographic location,requirement-meeting geological conditions,both injection & production and storage capacities large enough for emergency and peak shaving in gas supply,and reliable gas sources for storage,etc.By use of these criteria,the Xiangguosi Carboniferous depleted gas reservoirs have obvious advantages in geological conditions,storage function,and storage site preference over the other selective depleted gas reservoirs.Furthermore,a feasibility study and a preliminary design are both made on the construction of underground gas storage based on the Xiangguosi depleted gas reservoirs.