Tacan Well 1 , as the first ultra-deep exploratory well in Tarim so far, encountered severe wellbore collapsing and hardly continue drilling in dolomite formation.

• 塔参1井是迄今为止在塔里木盆地钻成的陆上第一超深井。该井在钻进奥陶系、寒武系白云岩地层时，井眼发生严重坍塌，导致难以继续钻进。