Abstract: According to the organic geochemical analysis including rock pyrolysis, residual organic carbon content, kerogen carbon isotope, organic maceral, vitrinite reflectance, gas chromatography of saturated hydrocarbon, etc. , a comprehensive study on organic matter abundance, type and maturity of Lower Carboniferious Nanmingshui Formation mudstone and shale outcrop samples in Shaerbulake region of Fuyun County was made, and the original sedimentary environment and bio-inputs of organic matter were discussed. The results show that the second and third member of Nanmingshui Formation with organic carbon in relatively high content belong to good source rocks. The organic matter in the second member is type Ⅱ₂and type Ⅲ, and that in the third member is type Ⅲ. The organic matter has a high degree of thermal evolution and is at the high-mature and over-mature stage. The source rocks are deposited in an open water of strong reduction and high salty. The organic matters are mainly derived from terrestrial higher plant, and mixed with few input of aquatic low organisms.

Key words: Shaerbulake region, Nanmingshui Formation, source rock, organic geochemistry

摘要： 应用岩石热解、有机碳、干酪根碳同位素、有机显微组分、镜质组反射率、饱和烃气相色谱等有机地球化学分析测试资料, 综合分析了沙尔布拉克地区下石炭统南明水组泥、页岩露头样品的有机质丰度、类型和成熟度, 探讨了有机质的原始沉积环境和生源特征。结果表明:南明水组第二、三亚组烃源岩有机碳含量高, 属于好烃源岩; 第二亚组的有机质类型为 Ⅱ₂ 型和Ⅲ型, 第三亚组的有机质类型为Ⅲ型;有机质热演化程度高, 处于高-过成熟阶段; 沉积环境为强还原、高盐度的开放性水体; 有机质生源以陆生高等植物为主, 并有部分低等水生生物输入。

关键词: 沙尔布拉克地区, 南明水组, 烃源岩, 有机地球化学