三水盐矿老腔储气库密闭性评价

Evaluation of Airtightness of Old Cavity Gas Storage in Sanshui Salt Mine

广东省三水盐矿为低品位盐层,夹层多且岩性变化大,已有盐穴溶腔围岩是否满足储气密闭性值得探究。以三水SS1-4老腔为示范案例,建立了盐穴老腔储气库的密闭性评价数值模拟,研究了所储气体在围岩中的渗透范围、孔隙压力和渗漏量。结合密闭性评价指标,探讨了当夹层不同渗透性时气体在围岩中的渗透特征。该研究为三水盐矿及同类地层老腔储气库的选址和运行等提供了重要指导。

The Sanshui salt mine in Guangdong Province is a low-grade salt layer with many interlayers and large lithology changes.It is worth exploring whether the surrounding rock of existing salt cavers meets the gas storage tightness.Taking Sanshui SS1-4 caverns as a demonstration case,a numerical simulation for evaluating the airtightness of salt cavern caverns was established,and the permeability range,pore pressure and leakage of the gas stored in the surrounding rock were studied.The permeation characteristics of gas in surrounding rock with different permeability of interlayer are discussed based on the evaluation index of tightness.This study provides important guidance for the location and operation of Sanshui salt mine and similar strata old cavity gas storage.