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西永一井位于我国西沙群岛永兴岛上,井深1384.6米,钻入基底变质岩百余米,其上为1200余米厚的沉积盖层——碳酸盐岩,它不仅揭示了我国南海晚第三纪的沉积面貌,也为我们研究南海地质构造特征提供了资料.一、地层简述西沙群岛西永一井的上第三系为一套浅海碳酸盐岩沉积.与上覆第四系为整合接触,与下伏花岗片麻岩为不整合接触.现将西永一井地层层序简述如下:
Xiyongyijing is located on Yongxing Island in the Xisha Islands, China. It is 1384.6 meters deep and drilled into the basement metamorphic rocks more than 100 meters. On top of it, it is a sedimentary cover-carbonate rock of more than 1200 meters. It not only reveals that the South China Sea night The depositional facies of the Tertiary Period also provide us with the data for studying the geological structural features of the South China Sea I. Brief Description of the Stratigraphy The Upper Tertiary of the Xiyongyijing in the Xisha Islands is a set of shallow marine carbonate sediments and is related to the overlying Quaternary For the integration of contact with the underlying granitic gneiss unconformity contact now West Wing wells sequence is as follows: