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若尔盖矿区为国家重点矿区之一,从65年开始钻探施工以来,由于钻孔穿过地层比较复杂,断层、裂隙多,岩石节理、劈理密集发育,岩性变化大,如Z K_(862)线3号孔,在四个大层中:板岩、硅岩、灰岩、板岩,换层42次,平均孔深25米换层七次;岩石软硬不均,有8～10级硬、脆、碎的硅岩,有4～5级软而疏松的炭质板岩、千枚状板岩,而且还有火山岩、变质岩、侵入体,呈薄层穿插透镜体产出。一般钻孔均遇到涌水、漏水、掉块、缩径、坍塌等复杂情况的发生,给钻探护孔工作增加了不少困难。
The Zoige mining area is one of the key national mining areas. Since the 65 years of drilling construction, the borehole has great changes in lithology due to the complicated boreholes penetrating the strata, the large number of faults and fissures, the intensive rock joints and cleavage, Line No. 3 hole, in four large layers: slate, silicalite, limestone, slate, exchange layer 42 times, the average hole depth of 25 meters for seven times the exchange layer; rock hard and soft uneven, with 8 to 10 Hard, brittle and broken silicon rocks, 4 to 5 soft and loose carbonaceous slate, thousands of plate slate, but also volcanic rocks, metamorphic rocks, invaded the body, a thin layer of interspersed lens output. General drilling encountered water gushing, leaking, falling blocks, diameter reduction, collapse and other complex occurrences, drilling holes to work has increased a lot of difficulties.