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在广泛调研前人研究的基础上,对曾母盆地新生界典型煤系烃源岩的有机地球化学、有机岩石学以及沉积成因特征进行了系统分析,进而探讨了该盆地煤系烃源岩的生油潜力。微观显微组分组成及成因分析,结合宏观沉积相研究,揭示出曾母盆地具有良好生烃潜力的下中新统煤系烃源岩发育于下三角洲平原带的红树林沉积环境中。对显微组分定量数据、基本生烃指标以及烃源岩热演化阶段的分析表明,该套煤系烃源岩具有在低熟阶段生油以及排烃的良好条件。另外,由于烃源岩中丰富的渗出沥青体生成而产生的内部增压,导致了大量相互连通的微裂隙发育,这有助于煤系烃源岩中析出油滴的汇聚以及排出。
Based on extensive research on previous studies, the organic geochemistry, organic petrology and sedimentary genetic characteristics of the Cenozoic coal measures of the source rocks in the Cenozoic of the Zengmu Basin have been systematically analyzed. Oil potential. Based on the study of macro-sedimentary facies, it is revealed that the Lower Miocene coal-measure source rocks with good potential for hydrocarbon generation in Zengmu Basin develop in mangrove sedimentary environment in the lower delta plain. The quantitative data of micro-components, basic hydrocarbon generation indicators and the thermal evolution of hydrocarbon source rocks show that the coal-bearing source rocks have good conditions for oil generation and hydrocarbon expulsion in the low-mature stage. In addition, due to the internal pressurization caused by the abundant exudative bitumen formation in the source rocks, a large number of micro-fractures are formed, which are conducive to the accumulation and discharge of oil droplets precipitated in the coal-based source rocks.