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海南岛西北部排浦岸礁区内具有珊瑚礁发育所需的温暖、激荡的浅水环境。沿岸侵蚀性海岸与河流输入大量泥砂,形成浑水沉积,其海水透明度仅为2—8m,沉积物中陆源碎屑含量平均高达20％左右。根据地貌形态和沉积特征,礁区可划分为礁前泻湖砂相、原地珊瑚礁岩相,礁坪含原生礁砂砾相、海蚀坪-沿岸水道砂相及海滩-海岸砂堤砂相。 区内河流和海湾出口处具有典型的三角洲相沉积,在西南大铲珊瑚堤礁的向海侧为典型的礁相沉积,排浦岸礁则以碳酸盐为主,并含一定量的陆源碎屑物的浑水沉积。这三种沉积类型均受沉积环境的严格控制。
In the northwestern part of Hainan Island, there is a warm, turbulent, shallow water environment required for the development of coral reefs within the Puhe Reef. A large amount of sediment is input into the coastal coasts and rivers to form muddy water. The transparency of seawater is only 2-8m, and the average content of terrigenous debris in sediments is as high as about 20%. According to the geomorphology and sedimentary characteristics, the reef can be divided into the reef lagoon facies, the in situ reef facies, the reef gravel facies, the sea-abyss-coastal channel sand beach and the beach sand bank dike sand facies. The rivers and gulf in the area have typical delta facies sediments. In the southwestern shoal coral reef, the typical reef facies deposits are located on the seaward side of the shoal while the bank rifts are mainly carbonate and contain a certain amount of terrestrial Detrital sediment. All three types of deposition are subject to strict control of the depositional environment.