【摘要】 为建立西沙地区与邻近琼东南盆地深水区之间可对比的地层格架及明确二者之间碳酸盐岩—生物礁群的发育规律,基于岩芯暴露面、生物地层、古地磁及化学地层的分析与相互印证,开展了西科1井的综合地层研究。研究认为该井0～214.89 m为乐东组,底界年龄约2.0 Ma; 214.89～288.43 m为莺歌海组一段,底界年龄约3.2 Ma; 288.43～374.95 m为莺歌海组二段,底界年龄约5.3Ma; 374.95～470.1m为黄流组一段,底界年龄约7.2 Ma; 470.1～576.5 m为黄流组二段,底界年龄约11.6 Ma; 576.5～758.4 m为梅山组一段,底界年龄约13.8 Ma;758.4～1032.46m为梅山组二段,底界年龄约16Ma;1032.46～1179.69m为三亚组一段,底界年龄约21Ma;1179.69～1257.52 m为三亚组二段,底界年龄约23 Ma。更多还原

【Abstract】 In order to establish a stratigraphic framework and to understand the development of carbonate reefs between the Xisha area and the adjacent deepwater area of the Qiongdongnan Basin, we carried out an integated biotratigraphic, chemostratigraphic, and magnetostratigraphic study of Well XK-1 in the Xisha area. The results show that 0～214.89 m is the Ledong Formation in Well XK-1, with a possible bottom age of 2.0 Ma, 214.89～288.43 m is member if the Yinggehai Formation in Well XK-1, with a possible bottom age of 3.2 Ma; 288.43～374.95 m is the second member of the Yinggehai Formation in Well XK-1, with a possible bottom age of 5.3 Ma; 374.95～470.1 m is the first member of the Huangliu Formation in Well XK-1, with a possible bottom age of 7.2 Ma; 470.1～576.5 m is the second member of the Huangliu Formation in Well XK-1, with a possible bottom age of 11.6 Ma; 576.5～758.4 m is the first member of the Meishan Formation in Well XK-1, with a possible bottom age of 13.8 Ma; 758.4～1032.46 m is the second member of the Meishan Formation in Well XK-1, with a possible bottom age of 16 Ma; 1032.46～1179.69 m is the first member of the Sanya Formation in Well XK-1, with a possible bottom age of 21 Ma; 1179.69～1257.52 m is the second member of the Sanya Formation in Well XK-1, with a possible bottom age of 23 Ma.更多还原