摘要
根据烃源岩地球化学评价标准对豫西地区伊洛盆地煤系烃源岩进行地球化学分析,利用扫描电镜、岩心观察等手段分别对研究区石炭—二叠系烃源岩高热演化程度低的可能性因素进行微观和宏观方面的定性分析。研究结果表明豫西南华北盆地太原组、山西组烃源岩有机碳含量较高为中等—好烃源岩,整体有机质类型表现为III型,有机显微组分中镜质组含量最高、壳质组其次,生烃潜量低热演化程度高,通过宏观岩心观察发现在岩心中存在大量裂缝,通过扫描电镜观察发现样品中存在大量的微裂缝和微孔隙,包括一些粒间孔、粒内孔、晶间孔、铸模孔、成岩收缩缝、微裂缝和有机孔等。这些裂隙和孔隙的存在是造成研究区烃源岩高热演化程度低生烃潜量的可能因素。
According to the evaluation standard of hydrocarbon source rock geochemistry, the geochemical characteristics of coal measure source rocks in Yiluo Basin,western of Henan Province were analyzed in this work. Possible factors of high thermal evolution and low generating hydrocarbon potential of Carboniferous Permian source rocks in study area were carried out by macroscopic and microcosmic qualitative analysis using scanning electron microscope （SEM） and core observation methods. The results showed that the organic carbon content in the Taiyuan Formation and Shanxi Formation was high,where the source rocks were medium-good and the organic matter type was III. In all organic maceral, the vitrinite content was the highest and the exinite took second place. Many fractures were found by core observation methods. A large number of micro-fracture and micro-pores, including inter-particle pore, intra-particle pore, intra-crystalline pore, corrosion pore, rock convergent, micro fracture and organic matter pore, were found in samples by SEM. It was thought in this work that the existence of these fracture and pore was main factors of low hydrocarbon generating potential and high thermal maturity of source rocks in study area.
出处
《电子显微学报》
CAS
CSCD
2017年第1期24-30,共7页
Journal of Chinese Electron Microscopy Society
关键词
裂缝
孔隙
扫描电镜
烃源岩
南华北盆地
crack
pore
SEM
hydrocarbon source rock
north China basin
