下扬子区海相古生界高成熟烃源岩评价指标的优选

以下扬子区陆域2口地质浅钻及南黄海科学钻探CSDP-2井的古生界烃源岩样品为研究对象，采用有机岩石学和有机地球化学研究方法，对下扬子区海相古生界烃源岩有机质丰度、类型及成熟度的测试指标进行厘定，判识烃源岩评价指标参数的有效性，从而建立一套适合该区热演化程度高，达到高-过成熟烃源岩的评价指标体系。综合分析认为，基于常规烃源岩评价指标（氯仿沥青"A"，热解生烃潜量（S1+S2）、氢指数（HI）和常规生标参数等）已失效的情况下，可采用总有机碳含量、有机显微组分和干酪根碳同位素特征、"沥青反射率"和金刚烷参数分别作为下扬子区古生界烃源岩有机质丰度、类型和成熟度判识的优选组合指标，进而为下扬子区海域延伸部分南黄海盆地的海相古生界高成熟烃源岩的评价、指标参数的选择提供重要的参考和指导。

Optimization of evaluation index of Paleozoic high mature marine source rock in the Lower Yangze region

With organic petrology and organic geochemistry as the method, based on the analysis of the Palaeozoic hydrocarbon source rock samples from two shallow drillings in the Lower Yangtze and well CSDP-2 in the south Yellow Sea, the organic matter abundance, type and maturity test of marine Paleozoic hydrocarbon source rocks in the Lower Yangtze area are determined to judge the validity of the hydrocarbon source rock evaluation parameters and to finally establish an assessment indicator system suitable for the high thermal evolution and matured hydrocarbon source rock area.Comprehensive analysis suggests that due to failure of the conventional source rock evaluation indexes(such as chloroform bitumen "A", pyrolysis hydrocarbon generation potential and hydrogen index), the content of organic carbon, organic micro-components and kerogen carbon isotopic composition, "bitumen reflectance" and double adamantine can be respectively used as effective indicator index of organic matter abundance, type and maturity of Paleozoic marine source rock in the Lower Yangtze region.The research results can provide important reference and guiding for the evaluation of Paleozoic highly mature hydrocarbon source rocks and the selection of index parameters in the South Yellow Sea Basin known as the marine extension of the Lower Yangtze area.