皖南埃迪卡拉系蓝田组页岩的有机质富集与孔隙发育特征

发布时间：2018-06-29 22:37

本文选题：埃迪卡拉系 + 蓝田组页岩　；参考：《地球化学》2017年02期

【摘要】：中国南方广泛分布的三套海相黑色页岩中,埃迪卡拉系页岩的有机质分布与富集特征研究较为薄弱。在皖南蓝田组黑色页岩近期的研究基础上,进一步对比分析了扬子区不同沉积相页岩的有机质富集规律,通过不同显微尺度的观察技术研究了蓝田组页岩中有机质的分布特征,并根据扫描电镜观察结果采用图像分析方法评价了孔隙发育特征。结果表明:(1)埃迪卡拉系有机质富集层位主要有3套,以下扬子皖南地区沉积的蓝田组(相当于陡山沱组)Ⅱ段为最优;(2)蓝田组页岩中有机质多以不规则多边形、条带或基质分散的形式充填于矿物粒间、黄铁矿晶间以及黏土矿物集合体层间,大量的黄铁矿主要以10μm的草莓状集合体形式出现,晶体间几乎全部被有机质充填;(3)高分辨扫描电镜图像分析表明,蓝田组页岩的孔隙以有机孔为主,孔径多小于100 nm。
[Abstract]:In the three sets of marine black shale widely distributed in southern China, the distribution and enrichment characteristics of organic matter in the Edikala shale are relatively weak. On the basis of recent research on black shale of Lantian formation in southern Anhui Province, the enrichment law of organic matter in different sedimentary facies shale in Yangtze area is further analyzed, and the distribution characteristics of organic matter in shale of Lantian formation are studied by using different microscopic scale observation techniques. The characteristics of pore development were evaluated by image analysis according to the results of scanning electron microscope (SEM). The results are as follows: (1) there are mainly three sets of enriched layers of organic matter in the Edikala system, and the Lantian formation (equivalent to Doushantuo formation) is the best one in the sediments in the south of Yangtze and Anhui, and (2) the organic matter in the shale of the Lantian formation is mostly irregular polygon. The form of strip or matrix dispersion is filled in the form of mineral intergranular, pyrite intergranular and clay mineral aggregates, and a large amount of pyrite mainly occurs in the form of strawberry aggregates of 10 渭 m. (3) the high resolution scanning electron microscope image analysis shows that the pores of the Lantian formation shale are mainly organic pores, and the pore size is less than 100 nm.
【作者单位】：有机地球化学国家重点实验室中国科学院广州地球化学研究所中国科学院大学资源地层学与古地理学重点实验室中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室中国科学院南京地质古生物研究所
【基金】：中国科学院重点部署项目(KZZD-EW-02-3);中国科学院战略性先导专项(XDB10010204);中国科学院“一三五”规划(135TP201602)
【分类号】：P618.13

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