Abstract The onshore Mangyshlak Basin, located in western Kazakhstan along the eastern coastline of the Caspian Sea, is a prolific hydrocarbon province and home to numerous oil and gas fields. The primary reservoirs are Jurassic clastic sandstones, but the Dunga Field contains hydrocarbons in Lower Cretaceous (Valanginian, Barremian, Aptian, Albian) clastic and carbonate reservoirs. The general perception is that these petroleum accumulations were charged from marine source rocks of likely Middle Triassic age. A detailed organic geochemical investigation of oils from the Cretaceous reservoirs of Dunga Field suggests that all were generated from the same lacustrine source rock facies (organofacies C) in mature kitchens in the offshore Mangyshlak Basin, followed by a complex filling history. The oils are characterised by relatively high wax content, low sulfur content (mainly

中文翻译：

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哈萨克斯坦西部 Dunga 油田石油的地球化学成分：湖源和复杂充填历史的证据

摘要 陆上 Mangyshlak 盆地位于哈萨克斯坦西部，沿里海东部海岸线，是一个油气资源丰富的省份，拥有众多油气田。主要储层为侏罗系碎屑砂岩，但 Dunga 油田在下白垩统（瓦兰吉阶、巴雷米阶、阿普梯阶、阿尔比阶）碎屑和碳酸盐岩储层中含有碳氢化合物。普遍的看法是，这些石油聚集来自可能是中三叠世时代的海相烃源岩。对 Dunga 油田白垩纪油藏石油的详细有机地球化学调查表明，所有油都产自 Mangyshlak 盆地近海成熟厨房中相同的湖相烃源岩相（有机相 C），随后是复杂的充填历史。这些油的特点是蜡含量相对较高，