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Sequence paleogeography and coal accumulation in epicontinental basin

International Journal of Mining Science and Technology 2013年第6期23卷 943-952页

作者： Lu Jing Shao Longyi Yang Minfang Wang Hao Qing Kangyang State Key Laboratory of coal Resources and Safe Mining China University of Mining&Technology Langfang Branch of Petroleum Exploration and Development Research Institute PetroChina

Based on an investigation of the Benxi-Shanxi formations in the southwestern Shandong province,we studied the forming mechanisms of key stratigraphic boundaries in an epicontinental basin and the coal-accumulating characteristics in the paleogeographic background of isochronous stratigraphic frameworks.In total,we sequenced three types of stratigraphic boundaries(i.e.,regional unconformities,the shifting surface of transgressions caused by basin basement subsidence,and fluvial erosional surfaces including exposed surfaces as well as correlative conformities,which are caused by forced regression)and proposed a model for coal-accumulation.The results show that in the high accommodation space of the barrier coast system in the lower Benxi-Taiyuan formations,the base level was higher than sedimentary boundaries,parasequences were bounded by a marine flooding surface and formed during the semi-cycle of base level falling that was influenced by high-frequency fluctuations of base level,and coal seams were thin with multistoried patterns.In this region,the coal accumulating center was located in the transitional zone of the barrier island and tidal-flat.In the low accommodation space of the fluvial delta in the upper Shanxi formation,the base level coincided with sedimentary boundaries,parasequences formed during the semi-cycle of base level rising were bounded by erosional surfaces and a marine flooding surface,and the coal accumulating center was located in the lower deltaic plain and interdistributary lacustrine environment.In this region,the surplus accommodation space was relatively high.

关键词： Epicontinental basin Sequence stratigraphy Barrier coast Fluvial delta coal accumulation

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A Systematic Analysis of coal accumulation Process

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Acta Geologica Sinica(English Edition) 2008年第3期82卷 709-716页

作者： CHENG Aiguo China National Administration of coal Geology Beijing 100039 China

Formation of coal seam and coal-rich zone is an integrated result of a series of factors in coal accumulation process. The coal accumulation system is an architectural aggregation of coal accumulation factors. It can be classified into 4 levels： the global coal accumulation super-system, the coal accumulation domain mega-system, the coal accumulation basin system, and the coal seam or coal seam set sub-system. The coal accumulation process is an open, dynamic, and grey system, and is meanwhile a system with such natures as aggregation, relevance, entirety, purpose-orientated, hierarchy, and environment adaptability. In this paper, we take coal accumulation process as a system to study origin of coal seam and coal-rich zone; and we will discuss a methodology of the systematic analysis of coal accumulation process. As an example, the Ordos coal basin was investigated to elucidate the application of the method of the coal accumulation system analysis.

关键词： coal accumulation system theory systematic analysis Ordos Basin

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Characteristics of coal accumulation of Transform-Extensional Basins in Linear Fracture Zones: A Case Study of the Meihekou Basin

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Acta Geologica Sinica(English Edition) 1999年第1期73卷 104-110页

作者： ZHUANG Xinguo Institute of Sedimentary Basin, Faculty of Earth Resources China University of Geosciences, Wuhan, Hubei 430074 China Univ Geosci Fac Earth Resources Inst Sedimentary Basin Wuhan 430074 Hubei Peoples R China

This paper discusses the characteristics of coal accumulation of transfor-extensional basins in linear fracture zones on the basis of an analysis of tectonic evolution and sequence stratigraphy in the Meihekou basin. coal accumulation of the basin occurred mainly in the accelerated rifting period of the transtentional regime and in the late period of tectonic transformation of the transpressional regime. In the former period, swamps developed in shallow lakes. The thickness of coal seams was controlled by the activity of fault block. Thick coal was formed in a downfaulted trough. In the latter period, swamps developed in a braided fan delta plain. The coal seams are thin and have poor lateral continuity. The thickness of coal seams was controlled by the migration of water channels in the braided plain.

关键词： coal accumulation sequence stratigraphy tectonic evolution Meihekou basin

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A study of sequence stratigraphy of the Early Cretaceous coal-bearing series in the southeastern Songliao Basin, NE China

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International Journal of coal Science & Technology 2020年第2期7卷 263-272页

作者： Kai Shao Longyi Shao Dongmin Ma Dongdong Wang Shuai Wang Di Gao College of Resources and Environments Xi’an University of Science and TechnologyXi’an710054ShaanxiChina State Key Laboratory of coal Resources and Safe Mining and College of Geoscience and Surveying Engineering China University of Mining and Technology(Beijing)Beijing10008China Shannxi coalbed Methane Development Company Limited Xi’an710119ShaanxiChina College of Geological Science and Engineering Shandong University of Science and TechnologyQingdao266590ShandongChina College of Resources and Environments Henan Polytechnic UniversityJiaozuo454000HenanChina

The Early Cretaceous is an important coal accumulation period in China.Abundant coal resources were formed in the southeastern margin of Songliao Basin.Sequence stratigraphy and coal accumulation of the Early Cretaceous in the southeastern margin of Songliao Basin have been studied on the basis of extensive outcrop and borehole data.Based on regional unconformity,basal erosional surfaces of incised valley fills,and abrupt depositional facies-reversal surface,six sequence boundaries have been identified,which subdivide the Early Cretaceous coal-bearing series into 5 third-order sequences.Sequence I corresponds to Huoshiling Formation,sequences II and III correspond to member I and member II of Shahezi Formation.Sequences IV and V correspond to member I and member II of Yingcheng Formation.Sequence I developed at the initial subsiding stage,sequence II and III developed during the stable subsiding stage,while sequence IV and V developed during the basin shrinkage stage.The major coal seams were developed in the sequence II and III,which ensured the relative balance between the increase rate of the accommodation space and the rate of peat accumulation for a longer period,thus forming a thick coal seam.

关键词： Songliao Basin Sequence stratigraphy Depositional system coal accumulation

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