论文部分内容阅读
应用岩石热解实验、显微镜下观察、有机元素分析和镜质组反射率等分析方法,通过有机质丰度、类型、成熟度及生物标志化合物等方面研究,对鄂尔多斯盆地镇探1井中生界和古生界烃源岩地球化学特征进行了综合评价。古生界太原组和山西组烃源岩有机质丰度低,干酪根类型以腐殖型为主,有机质处于过成熟阶段,气态烃生成能力较强,综合评价为差烃源岩;中生界延长组和延安组烃源岩有机质丰度较高,干酪根类型以腐殖型为主,有机质处于成熟阶段,液态烃生成能力较强,综合评价为中等烃源岩。古生界有机质原始生物组合中陆源植物和水生生物含量相近,在湖相还原条件下堆积和保存;中生界有机质原始生物组合中陆源植物稍占优势,在湖相弱还原——还原条件下沉积。
By means of rock pyrolysis experiment, microscopic observation, organic elemental analysis and vitrinite reflectance analysis, through the study of organic matter abundance, type, maturity and biomarker compounds, The geochemical characteristics of the Paleozoic source rocks were comprehensively evaluated. The Paleozoic source rocks of the Taiyuan Formation and Shanxi Formation have low organic matter abundance, mainly kerogen type and mature organic matter. The hydrocarbon generation ability of the Taiyuan Formation and Shanxi Formation is relatively poor, and the synthetic evaluation is poor source rock. Mesozoic The Yanchang Formation and Yan’an Formation have higher organic matter abundance. The kerogen type is dominated by humus. The organic matter is in the mature stage and the liquid hydrocarbon generation ability is stronger. The comprehensive evaluation is medium source rock. In the Paleozoic organic matter primary organism assemblages, the terrestrial plants are similar to aquatic organisms, and are accumulated and preserved under the lake-phase reduction conditions. The terrestrial plants in the Mesozoic organic matter initial assemblages are slightly dominant. Under the weak reduction-reduction conditions Deposition.