The Lishui Sag, situated at the East China Sea Shelf Basin, is regarded as one of the most prospecting oil exploration zones. Low exploration in this region requires detailed identification of source rocks to enhance further oil and gas exploration. Three potential source rocks, including the Paleocene Yueguifeng (E₁y), Lingfeng (E₁l) and Mingyuefeng (E₁m) Formations, were investigated by integrating organic and inorganic geochemistry to estimate hydrocarbon generation potential, and to document original organic matter input and deposition environments. Two deposition models for source rocks were established considering tectonic subsidence and climate variation. The result shows that the E₁y mudstones are dominated by high TOC content, oil/gas-prone kerogen at moderate maturity stage with relatively high hydrocarbon generation potential, whereas E₁l and E₁m mudstones are dominated by low TOC content, gas-prone kerogen at low to moderate maturity stage with low hydrocarbon generation potential, and coals with high hydrocarbon generation potential. The original organic matter input and deposition environment are obviously different among these three potential source rocks and are controlled by the coupling of tectonic subsidence and climate variation. Insufficient material supply lead mudstone deposition in a hemi-deep/deep lake during the E₁y period, resulting in inefficient water mixing and stable water column stratification (high Gammacerane Indexs). The weak water inflow supplied minor oxygen and terrigenous organic matter to the lake due to arid-hot climate, as indicated by low Pr/Ph, C₁₉ T/C₂₃T, C₂₀ T/C₂₃T and C₂₄Tet/C₂₆T ratios, low Oleanane Indexs, and high C₃₅ Homohopane Indexs and V/Ni ratios. Water algae, including pediastrums and chlorellas, which contributed to the development of high-quality source rocks, could be efficiently preserved in dysoxic condition. High subsidence rate together with sufficient sediment supply during the transgression in the E₁l and E₁m periods developed a coastal marine or paralic environment. The alternated climate brought unstable water inflow against stable water column stratification (low Gammacerane Indexs). Strong water inflow due to warm-humid climate provides abundant terrigenous organic matter and oxygen to the lake as indicated by high Pr/Ph, C₁₉ T/C₂₃T, C₂₀ T/C₂₃T and C₂₄Tet/C₂₆T ratios, high Oleanane Indexs, low C₃₅ Homohopane Indexs and V/Ni ratios, and rich C₂₉ steranes. Algal might be preferentially oxidized and degraded in aerobic conditions. Thus, mudstone is regarded as general-quality source rocks but coal is regarded as high-quality source rocks. Weak water inflow under arid-hot climate provided subtle aquatic and terrigenous organic matter to the lake, resulting in poor-quality source rocks.

位于东海陆架盆地的Basin水凹陷被认为是最有前途的石油勘探区之一。该地区的低勘探需要详细识别烃源岩，以进一步进行油气勘探。三个潜在的烃源岩，包括古Yueguifeng（E ₁ Y），凌风（E ₁ l）和明月峰（E ₁米）地层中，通过集成的有机和无机地球化学估计烃潜力，并记录原始有机物研究输入和沉积环境。考虑构造沉降和气候变化，建立了两种烃源岩沉积模型。结果表明，E ₁y泥岩以高TOC含量占主导地位，在中等成熟度阶段具有油气易发干酪根，具有较高的生烃潜力，而E ₁ l和E ₁ m泥岩以低TOC含量占主导地位，低至中度呈气体倾向的干酪根烃生成潜力低的成熟阶段，以及烃生成潜力高的煤。这三种潜在烃源岩的原始有机质输入和沉积环境明显不同，并且受构造沉降和气候变化耦合的控制。E ₁期间物质供应不足导致半深/深湖中的泥岩沉积在y周期内，导致水混合效率低和水柱分层稳定（高γ-角庚烷指数）。由于干旱/炎热的气候，弱水流入向湖泊提供了少量的氧气和陆源性有机质，如低Pr / Ph，C ₁₉  T / C ₂₃ T，C ₂₀  T / C ₂₃ T和C ₂₄ Tet / C所示。₂₆ T比，低Oleanane指数和高C _35均铁指数和V / Ni比。在缺氧条件下，可以有效地保存有助于形成优质烃源岩的包括藻类和小球藻在内的水藻。E ₁越海过程中沉陷率高，沉积物供应充足l和E ₁ m时期形成了沿海海洋或Paralic环境。交替的气候带来不稳定的水流入，不利于稳定的水柱分层（γ-角姜烷指数低）。如高Pr / Ph，C ₁₉  T / C ₂₃ T，C ₂₀  T / C ₂₃ T和C ₂₄ Tet / C ₂₆ T所示，由于温暖湿润的气候导致大量的水流入湖泊，为湖泊提供了丰富的陆源有机质和氧气。比率，高橄榄烷指数，低C _35均聚物指数和V / Ni比以及富C ₂₉甾烷。在有氧条件下，藻类可能会被优先氧化和降解。因此，泥岩被认为是优质烃源岩，而煤被认为是优质烃源岩。在干旱炎热的气候下，少量的水流入为湖泊提供了微妙的水生和陆源有机质，从而导致了劣质烃源岩。