湖北省云应地区盐岩溶腔型地下能源储库密闭性研究

着眼于我国深部盐岩能源地下储备可行性分析,针对湖北省云应盐矿盐岩层薄、富含不可溶或难溶夹层的沉积特点,开展该地区层状盐岩构造中能源储库密闭性综合研究。其一是层状盐岩体中盐岩–硬石膏界面力学特性室内试验研究,包括直剪试验、间接拉伸试验和界面微观分析试验。结果表明,层状盐岩体中盐岩–硬石膏界面具有较强的黏结力,不是一个弱面,这十分有利于盐岩溶腔的密闭性和稳定性。其二是现场盐岩层钻孔高压压水试验,对盐岩层渗透的规律性、盐岩的封闭性以及围岩的承载能力开展研究。综合层状盐岩室内和现场试验的成果表明:湖北省云应地区层状盐岩构造满足盐岩溶腔型地下能源储库的密闭性要求。

STUDY ON SEALABILITY OF UNDERGROUND ENERGY STORAGE IN DEEP SALT FORMATION IN YUNYING AREA,HUBEI PROVINCE

For the feasibility analysis of the energy storages in deep salt formation in China,a comprehensive analysis of the sealability of salt caverns as oil/gas storages in the Yunying salt mine in Hubei Province is proposed.In the salt mine,the salt layers are usually intersected by many indissoluble or slightly soluble interlayers.Considering these sedimentary characteristics,a series of experiments concerning the sealability of the salt storages are carried out.The experiments,i.e.direct shear test,Brazilian test and microscopic test,on the mechanical properties of the interfaces between salt and anhydrite layers show that the salt and anhydrite layers have been bonded perfectly,and the salt/anhydrite interfaces are actually not weak as expected.This unique feature benefits definitely the stability and sealability of the salt storage caverns.To further investigate the permeability,the sealability and the loading capacity of the bedded salt rocks,an in-situ high water pressure test on a borehole in the bedded salt formation is performed recently.From the in-door and in-situ experiments,a conclusion can be drawn that the bedded salt formation in the Yunying salt mine satisfies completely the sealability requirement of the energy storage caverns.