陆丰22洼是南海北部最具勘探潜力的新洼陷之一。为了更好地评价其烃源岩的资源潜力，综合运用元素地球化学和有机地球化学手段，结合文昌组的岩相组合、古生物特征，首次恢复了珠江口盆地陆丰22洼始新统文昌组的沉积古环境，进而结合有机碳含量揭示了新洼陷有机质富集的主控因素。结果表明：研究区文昌组沉积时的水体为的淡水-微咸水环境，古气候以温湿为主；湖水最深处在文五段顶部—文三段下部，各层段古水深、古盐度、古氧相等古环境存在差异。文一—文三段及文五段早期沉积期水体相对较浅，主要为弱氧化弱还原的滨浅湖—三角洲环境，古生产力水平一般；文四段沉积期水体较深，还原性最强，受热液影响，低等水生生物发育，生产力水平最高，有利于烃源岩的发育，发育半深湖-深湖相烃源岩，为近源勘探的优势层位。陆丰22洼文昌期烃源岩有机质的丰度与古生产力、古水深以及古氧相之间呈现较好的正相关关系，与良好的火山物质供给条件耦合，主要发育生产力与保存条件共控的优质烃源岩富集模式。

The Lufeng 22 Sag is one of the most prospective new sags for exploration in the northern South China Sea. Elemental geochemistry, organic geochemistry, lithofacies assemblages and paleobiological characteristics of the Wenchang Formation were integrated to evaluate its resource potential. The sedimentary paleoenvironment of the Eocene Wenchang Formation was reconstructed for the first time in the Lufeng 22 Sag. Organic carbon content was combined to reveal the main controlling factors of organic matter enrichment, and support was provided for resource potential evaluation and oil exploration deployment in the new sags of the northern South China Sea. The results show that a freshwater to brackish water body is indicated under a warm and humid paleoclimate. Obvious differences in paleowater depth, paleosalinity and paleo-redox conditions are observed among the members. The deepest lake water was located in the upper part of the Wenchang 5 Member to the lower part of the Wenchang 3 Member. The water body was relatively shallow during the deposition of the Wenchang 1 to Wenchang 3 Members and the early stage of the Wenchang 5 Member, mainly characterized by weakly oxidizing to weakly reducing coastal shallow lake to deltaic environments with moderate paleoproductivity. In contrast, during the deposition of the Wenchang 4 Member, the water body was deeper and had the strongest reducing conditions, influenced by hydrothermal activity. The development of lower aquatic organisms led to the highest productivity, which is most favorable for the development of high-quality source rocks. The Wenchang 4 Member is characterized by semi-deep to deep lake facies source rocks, representing an advantageous stratigraphic position for near-source exploration. A positive correlation is observed between organic matter abundance and paleoproductivity, paleowater depth and paleo-redox conditions. Volcanic nutrient supply is favourable. Both productivity and preservation are identified as the dominant controls on the enrichment of high-quality source rocks.