基于扫描电镜的豫西石炭—二叠系泥页岩高热演化低生烃潜量分析
黄雪峰，吴 伟，王雨涵基于扫描电镜的豫西石炭—二叠系泥页岩高热演化低生烃潜量分析
黄雪峰，吴 伟，王雨涵
（河南理工大学，河南焦作454003）
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，通过微观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。
关键词 裂缝；孔隙；扫描电镜；烃源岩；南华北盆地
中图分类号：TE122.1 文献标识码：A doi:10.3969/j.issn.1000-6281.2017.01.005
Analysis on high thermal revolution degree and low potential of generating hydrocarbon of Carboniferous Permian in the southwest of Henan Province by SEM
HUANG Xue-feng，WU Wei，WANG Yu-han
(Henan Polytechnic University, Jiaozuo Henan 454003，China)
Abstract 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 foundby 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.
Keywords crack；pore；SEM；hydrocarbon source rock；north China basin
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