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前言 西永一井位于西沙群岛的永兴岛,井深1384.6米,钻穿基底变质岩百余米,其上为1200余米厚的沉积盖层—碳酸盐岩。
Foreword Xiyongyijing is located in Yongxing Island, Xisha Islands, with a well depth of 1384.6 meters. It drills hundreds of meters of basement metamorphic rocks, and is a sedimentary cover-carbonate rock with a thickness of 1200 meters.