自贡大山铺废卤(气)井泄漏原因分析

On Cause of Dead Gas Well Leaking in Dashanpu, Zigong

四川省自贡市盐卤开发有近2 000年历史,大山铺曾是自贡市井矿盐生产基地之一,由于长期从事岩盐、天然气开采,留下了大量的废卤(气)井。分析表明:大山铺地下地质情况较为复杂,构造断裂、裂隙发育,且连通性较好,给卤(气)上窜提供了地质条件;卤(气)井未封井或套管腐蚀穿孔、破裂造成卤水及伴生天然气沿裂隙上窜,表现为对含水层、土地资源破坏及对空气的污染。

The Dashanpu area was a salt mining base and is characterized by and development of continuous fractures and fissures. Non-plugging wells and casing corrosion and development of continuous fractures and fissures result in dead gas well leaking.