The Ca Voi Xanh (CVX) gas field is located offshore Vietnam along the eastern margin of the southern Song Hong Basin. Reservoir rocks are carbonates of Middle Miocene (Langhian and Serravallian) age which developed on an isolated platform (length approximately 100 km, and width approximately 15 km) on top of the Triton Horst structural high. Shallow‐water corals and large and small benthic foraminifera are the main faunal constituents of the Langhian carbonates, whereas overlying Serravallian carbonates, the principal reservoir at CVX, are dominated by deeper‐water coralline red algae (rhodoliths) and large benthic foraminifera (LBF). The Serravallian carbonates consist of rhodolith‐LBF grainstones and packstones to mud‐lean packstones. Langhian carbonates consist of coral‐LBF grainstones‐packstone/rudstones.

中文翻译：

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越南中部孤立中新世碳酸盐岩地层的储层特征：CA VOI XANH场

Ca Voi Xanh（CVX）气田位于越南海上，沿Song Hong盆地南部的东缘。储层岩石是中新世（Langhian和Serravallian）时代的碳酸盐，在Triton Horst结构高处的顶部一个孤立的平台（长约100 km，宽约15 km）上发育。浅水珊瑚和大小底栖有孔虫是兰吉亚碳酸盐的主要动物成分，而上覆塞拉瓦利亚碳酸盐（CVX的主要储层）主要是深水珊瑚线红藻（rhodoliths）和大型底栖有孔虫（LBF）。 。塞拉瓦利亚碳酸盐岩由菱锰矿-LBF粒岩和泥岩到贫泥泥岩组成。Langhian碳酸盐包括珊瑚-LBF花岗岩-砾岩/灰岩。