Volcanic activity was quite frequent during the deposition of the Late Carboniferous Ha’erjiawu Formation in the Santanghu Basin. The petrology and organic and inorganic geochemical indicators were used to investigate hydrocarbon potential, paleoenvironmental conditions and organic matter enrichment of the mudstones. The results show that the oil generation capacity of the Ha’erjiawu Formation mudstones, which has abundant oil-prone organic matter (Type II kerogen with hydrogen index values mainly ranging from 250 to 550 mg HC/g TOC) in mature stage (T_max values mainly ranging from 435 to 450 °C), is considerable. The Ha’erjiawu Formation was deposited in a dysoxic, freshwater-mildly brackish, and warm-humid environment. During its deposition, the Ha’erjiawu Formation received hydrothermal inputs. The volcanic hydrothermal activities played an important role in the organic matter enrichment. In addition, the total organic carbon (TOC) is significantly positively correlated with the felsic mineral content, but it is negatively correlated with the carbonate mineral content and C₂₇/C₂₉ ratios, indicating that terrigenous organic matter input also contributed to the primary productivity in the surface water. Therefore, the formation of the high-quality source rocks in the Ha’erjiawu Formation was jointly affected by the hydrothermal activity and the terrigenous organic matter input.

在三塘湖盆地晚石炭纪的哈尔家屋组沉积过程中，火山活动非常频繁。利用岩石学，有机和无机地球化学指示剂研究了泥岩的油气潜力，古环境条件和有机质富集。结果表明，在成熟期（T _max）具有丰富的易生油有机质（Ⅱ型干酪根，氢指数值主要在250〜550 mg HC / g TOC）的哈尔家坞组泥岩的产油能力。值主要在435至450°C之间）。哈尔家坞组沉积在缺氧，淡水，微咸，温暖湿润的环境中。在沉积过程中，哈尔家坞组接受了热液输入。火山热液活动在有机质富集中起着重要作用。此外，总有机碳（TOC）与长英质矿物含量显着正相关，但与碳酸盐矿物含量和C ₂₇ / C ₂₉负相关。比率，表明陆源有机物的输入也有助于地表水的初级生产力。因此，哈尔加屋组优质烃源岩的形成受水热活动和陆源有机质输入的共同影响。