豫西义马煤田义马组沉积环境及聚煤规律
发布时间：2018-07-14 19:05
【摘要】：运用沉积学、古生物学、层序地层学、岩石学、煤地质学等学科的理论和方法,通过对义马煤田钻井岩芯和野外剖面的观察和室内试验研究,结合研究区150余口钻井等资料的综合分析,在研究区义马组识别出冲积扇、湖泊三角洲、湖泊等3种沉积相、8种沉积亚相以及14种沉积微相,并总结了其特征。在层序边界识别的基础上,将义马组划分为2个三级层序和6个体系域,建立了研究区层序地层格架,在层序地层格架内探讨了研究区义马组沉积演化规律:SQ1低位时期,盆地内主要发育冲积扇;湖侵时期,在研究区南部形成了大量的积水湖泊;高位时期,在扇前平原上形成了泥炭沼泽,并逐渐向北部扩展至全区。SQ2低位初期,研究区北西部和北东部分别形成了一个湖泊三角洲,并于低位末期在废弃的三角洲上形成了泥炭沼泽;湖侵时期,整个研究区被湖水淹没,发育湖泊沉积;高位时期,湖泊萎缩,在南部湖湾地区发育了泥炭沼泽,最后被马凹组冲积扇所覆盖。研究区义马组时期构造活动微弱、气候温湿、植物繁盛,有利于泥炭沼泽的发育。聚煤作用的发生受到沉积基底、沉积环境和湖平面变化的控制;总结出了冲积扇、三角洲和湖湾3种聚煤模式。
[Abstract]:Based on the theories and methods of sedimentology, paleontology, sequence stratigraphy, petrology, coal geology, etc., through observation of drilling core and field profile in Yima coalfield, Based on the comprehensive analysis of more than 150 drilling wells in the study area, three sedimentary facies, including alluvial fan, lacustrine delta and lake, are identified in the study area, including 8 sedimentary subfacies and 14 sedimentary microfacies, and their characteristics are summarized. On the basis of sequence boundary recognition, the Yima formation is divided into two third-order sequences and six system tracts. The sequence stratigraphic framework of the study area is established, and the sedimentary evolution law of the Yima formation in the study area is discussed in the low stage of < SQ1. The alluvial fan is mainly developed in the basin; during the lake transgression, a large number of stagnant lakes were formed in the southern part of the study area; in the high stage, peat swamps were formed on the fan front plain, and gradually extended to the north to the early stage of .SQ2 low level in the whole area. A lake delta was formed in the north west and the north east of the study area, and peat swamps were formed on the abandoned delta at the end of the lower stage; during the lake transgression, the whole study area was submerged by lake water and developed lake deposition. The lake shrank and peat swamps developed in the southern lake bay area, and were finally covered by alluvial fans of the Mawa formation. During the period of Yima formation in the study area, the tectonic activity was weak, the climate was warm and wet, and the plants were abundant, which was beneficial to the development of peat swamp. The occurrence of coal accumulation is controlled by sedimentary basement, sedimentary environment and lake level, and three coal accumulation models, alluvial fan, delta and lake bay, are summarized.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11
本文编号：2122660
[Abstract]:Based on the theories and methods of sedimentology, paleontology, sequence stratigraphy, petrology, coal geology, etc., through observation of drilling core and field profile in Yima coalfield, Based on the comprehensive analysis of more than 150 drilling wells in the study area, three sedimentary facies, including alluvial fan, lacustrine delta and lake, are identified in the study area, including 8 sedimentary subfacies and 14 sedimentary microfacies, and their characteristics are summarized. On the basis of sequence boundary recognition, the Yima formation is divided into two third-order sequences and six system tracts. The sequence stratigraphic framework of the study area is established, and the sedimentary evolution law of the Yima formation in the study area is discussed in the low stage of < SQ1. The alluvial fan is mainly developed in the basin; during the lake transgression, a large number of stagnant lakes were formed in the southern part of the study area; in the high stage, peat swamps were formed on the fan front plain, and gradually extended to the north to the early stage of .SQ2 low level in the whole area. A lake delta was formed in the north west and the north east of the study area, and peat swamps were formed on the abandoned delta at the end of the lower stage; during the lake transgression, the whole study area was submerged by lake water and developed lake deposition. The lake shrank and peat swamps developed in the southern lake bay area, and were finally covered by alluvial fans of the Mawa formation. During the period of Yima formation in the study area, the tectonic activity was weak, the climate was warm and wet, and the plants were abundant, which was beneficial to the development of peat swamp. The occurrence of coal accumulation is controlled by sedimentary basement, sedimentary environment and lake level, and three coal accumulation models, alluvial fan, delta and lake bay, are summarized.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.11
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