本溪地区本溪组沉积有机质演化

发布时间：2018-01-30 04:13

本文关键词： 本溪组镜质体反射率埋藏史有机质演化　出处：《沈阳师范大学》2015年硕士论文　论文类型：学位论文

【摘要】：石炭纪地层在我国华北地区分布广泛,在辽东地区,石炭纪地层十分发育。其中,本溪组是一套海陆交互相的地层,也是这一地区具有代表性的地层。本溪组地层在本溪地区出露地点分别是位于本溪市西北的牛毛岭、偏岭乡窑子峪、田师付镇孔家堡子地区,其中,牛毛岭剖面是本溪组的命名剖面。近百年来,很多地质古生物学家对本溪组的古生物和地层都进行了较为详细的探究。在此基础上,本论文着重研究本溪地区本溪组的沉降史及沉积有机质演化。本文研究了牛毛岭本溪组标准剖面、窑子峪本溪组剖面和田师付孔家堡子本溪组剖面的岩性及沉积层序,对窑子峪本溪组剖面进行了实际测量并进行了岩性分析。在三条剖面共采集Ro标本9个,并选择其中的4个样品进行了镜质体反射率的检测,其结果表明这一地区本溪组的有机质演化程度可达长焰煤—贫煤阶段。通过绘制相关的沉降史曲线图,分析本溪组煤系地层的埋藏史,认为这一地区的沉降史大致分为前期、中期和后期三个阶段,分别为缓慢沉降期、快速沉降期和抬升期。这一地区本溪组的古地理环境总体表现为河流到滨岸沼泽再到海陆交互相沉积的过程。
[Abstract]:Carboniferous strata are widely distributed in North China, and Carboniferous strata are well developed in the eastern part of Liaoning Province. Benxi formation in Benxi area is located in Niumoling, Yaoziyu, Yaoziyu, Tianshifu town, which is located in the northwest of Benxi city. Niumaoling section is a named section of Benxi formation. In the last hundred years, many geobiologists have studied the paleontology and strata of Benxi formation in detail. In this paper, the sedimentation history and the evolution of sedimentary organic matter of Benxi formation in Benxi area are studied, and the standard section of Niumaoling Benxi formation is studied in this paper. The lithology and sedimentary sequence of the section of the Yanziyu Benxi formation and the section of Fukongjiapuzi Benxi formation are measured and analyzed. Nine samples of Ro are collected in three sections. Four of the samples were selected for vitrinite reflectance detection. The results show that the evolution degree of organic matter in Benxi formation in this area can reach the stage of long flame coal and lean coal. By analyzing the burial history of coal measure strata in Benxi formation, it is considered that the subsidence history in this area can be divided into three stages, namely, the early stage, the middle stage and the later stage, respectively, which are the slow subsidence periods. The paleogeographic environment of Benxi formation in this area is the process of river to shore swamp and then to sea and land intersecting each other.
【学位授予单位】：沈阳师范大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11

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