厚夹层盐穴储气库单井双腔可行性分析

我国盐岩地层通常伴有厚夹层，针对厚夹层的盐岩地质条件，采用单井双腔的造腔方式，避开建库层段厚夹层，利用厚夹层的上部和下部盐层资源造腔，可提高盐岩资源利用率，扩大单井有效储气空间。以我国楚州盐矿厚夹层上、下两段盐层为造腔目标，设计单井双腔造腔方案开展模拟预测，对单井双腔建腔的钻井、造腔等工程费用进行测算，并与单井单腔造腔方案对比，结果表明:在特定的地质条件下，单井双腔造腔方案的有效体积为27.8×104 m3，单井单腔方案的有效体积为18.0×104 m3，采用单井双腔比单井单腔增加有效体积约54.4%，增加工作气量41.5%，节约单方建腔投资约21%。因此，单井双腔的造腔方式在储气库空间体积利用及单方地下工程投资等方面具有明显优势，有必要加强攻关研究与推广应用。

Feasibility analysis of single well and double cavity in the salt-cavern gas storage with thick sandwiches

The salt rock formations in China are usually associated with thick sandwiches. Considering the geological conditions of the salt rocks with thick sandwiches, the solution mining mode of single well and double cavity is adopted. In this mode, thick sandwich is excluded from the storage building interval, and the salt layers above and below it are used for storage building, so as to improve the utilization ratio of salt rock resources and increase the effective gas storage space of single well. In this paper, the solution mining scheme of single well and double cavity was designed to carry out simulation prediction with the salt layers above and below the thick sandwich in Chuzhou Salt Mine as the cavity building targets. In addition, the engineering expense (drilling and cavity building included) of the solution mining scheme of single well and double cavity was estimated and compared with that of single well and single cavity. It is indicated that under the particular geological conditions, the effective volume achieved by the solution mining scheme of single well and double cavity is 27.8×104 m3 and that achieved by the solution mining scheme of single well and single cavity is 18.0×104 m3. It means that compared with the solution mining scheme of single well and single cavity, the solution mining scheme of single well and double cavity increases the effective volume by about 54.4% and the working gas volume by 41.5% and saves the cavity building investment per cubic meter by 21%. In conclusion, the solution mining mode of single well and double cavity is much more advantageous in gas storage spatial volume utilization and underground engineering investment per cubic meter, so its research, popularization and application shall be strengthened.