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河南省西部中二叠统山西组聚煤环境及沉积演化特征
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摘要
本论文采用沉积学原理与岩相古地理研究的编图方法,通过野外地质剖面的实地测量与岩性描述,并结合收集到的野外露头、钻孔岩芯和测井等相关资料,分析了河南省西部地区山西组各种沉积相的沉积特征及沉积序列、聚煤环境和沉积演化特征,编制了研究区山西组地层综合柱状图、相柱状图、地层等厚线图、砂泥比等值线图和岩相古地理图,在此基础上取得以下主要工作进展:(1)本次工作共绘制河南省中二叠统山西组综合柱状图6张,相柱状图7张,地层等厚线图,砂泥比等值线图,构造古地理图,岩相古地理图和聚煤环境模式图各1张; (2)经综合分析在研究区山西组划分出5种沉积相,7种亚相,6种微相和14种沉积序列类型;(3)分析了整个研究区山西组聚煤环境及沉积序列特征,论述了河南省西部地区存在的两种聚煤环境模式,即三角洲分流间湾泥炭沼泽和潮坪聚煤环境。其中潮坪聚煤环境包括低位泥炭坪和高位淡水泥炭沼泽两种聚煤环境。讨论了各聚煤环境在区域上的分布特点;(4)总结了山西组沉积时期的环境演化过程,将其划分为下二煤旋回、中二煤旋回和上二煤旋回三个较大的沉积阶段。其沉积环境经历了海湾和泻湖—潮坪—下三角洲平原—上三角洲平原四种沉积环境的演变过程。
Based on the sedimentological theory, compiled map method of lithofacies paleogeography, the field measurements and lithological description of the outcrops, and combing with the relevant geologic informations including the outcrop, drilling cores and logging data, the integrated stratigraphic column, sedimentary facies column, the stratigraphic isopach map, sand-mud ratio contour map and lithofacies palaeogeography map of the Shanxi Formation have been drawn out in this work, meanwhile, the sedimentary characteristics and depositional successions of the various sedimentary facies, coal-accumulating environment and the characteristics of sedimentary evolution have been analyzed in the study area.On this basis, this paper made great progress in the following aspects:
     First, seven kinds of maps have been compiled in this work, including six pieces of integrated stratigraphic column, seven pieces of sedimentary facies column, the stratigraphic isopach map, sand-mud ratio contour map, tectonic palaeogeography map, lithofacies palaeogeography map and coal accumulating environment model of the Middle Permian Shanxi Formation, western Henan province.
     Second, on the basis of comprehensive analysis, five types of sedimentary facies, 7 sub-facies, six micro-facies, and 14 kinds of sedimentary successions in the Shanxi Formation of western Henan have been divided.
     Third, the coal accumulating environment and depositional sequence features in Shanxi Formation of western Henan are analyzed, and two kinds of coal accumulating environment models in the Shanxi Formation of western Henan, that is, deltaic interdistributary peat bog and tidal flat coal accumulating environments, in which latter contains low-level peat flat and high-level freshwater peat bog, are suggested. The distribution features of different coal accumulating environments in this region are also discussed.
     In the end, the evolution of depositional environment during the depositional period of the Shanxi Formation are Summarized, it can be divided into three large deposit phases, including the lower cycle of the coal II unit, the middle cycle of the coal II unit and the upper cycle of the coal II unit, and experienced a development of sedimentary environments from the bay and lagoon to tidal flat, and then to Lower delta plain and Upper delta plain.
引文
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