The eastern reef island area, with shallow seawater, is higher parts of Xisha apophysis, where the basement is directly covered with reef facies carbonate rocks.

东部岛礁区为西沙隆起的较高部位，海水较浅，基底之上直接覆盖礁相沉积地层。

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The occurrence of the Yutang lead and zinc-sulfide deposit in the Cambrian carbonate rocks is controlled mainly by tectonic, lithologic and algae reef factors.

渔塘铅锌矿床产于寒武纪碳酸盐岩中，主要受构造、岩性和藻礁相控制。

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Oil-gas fields in the carbonate rocks mainly distribute along fault belts, unconformity interfaces, reef zones, fissure zones and active source rocks.

勘探实践表明，碳酸盐岩油气田主要是沿断裂带、不整合面、生物礁发育带、裂缝带及有效烃源岩分布的。

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