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Influence of depositional environment on coalbed methane accumulation in the Carboniferous-Permian coal of the Qinshui Basin, northern China

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Frontiers of Earth Science 2019年第3期13卷 535-550页

作者： Haihai HOU Longyi SHAO Shuai wang Zhenghui XIAO xuetian wang Zhen LI College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China College of Mining Liaoning Technical UniversityFuxin 123000China School of Civil Engineering Hunan University of Science and TechnologyXiangtan 411201China

Based on analyses of the lithofacies palaeo-geography of the Taiyuan and the Shanxi Formations in the Qinshui Basin, the spatial variations of the coal seam thickness, coal maceral composition, coal quality, and gas content, together with the lithofacies of the surrounding rocks in each palaeogeographic unit were investigated. The results show that the thick coals of the Taiyuan Formation are mainly distributed in delta and barrier island depositional units in the Yangquan area in the northern part of the basin and the Zhangzi area in the southeastern part of the basin. The thick coals of the Shanxi Formation are located within transitional areas between delta plain and delta front depositional units in the central southern part of the basin. The Taiyuan Formation generally includes mudstone in its lower part, thick, continuous coal seams and limestones in its middle part, and thin, discontinuous coal seams and limestone and sand-mud interbeds in its top part. The Shanxi Formation consists of thick, continuous sandstones in its lower part, thick coal seams in its middle part, and thin coal seams, sandstone, and thick mudstone in its upper part. From the perspective of coal-bearing sedimentology and coalbed methane (CBM) geology, the lithology and thickness of the surrounding rocks of coal seams play more significant roles in controlling gas content variation than other factors such as coal thickness, coal macerals, and coal quality. Furthermore, it is found that the key factors influencing the gas content variation are the thicknesses of mudstone and limestone overlying a coal seam. At similar burial depths, the gas content of the Taiyuan coal seams decreases gradually in the lower delta plain, barrier-lagoon,delta front, barrier-tidal flat, and carbonate platform depositional units. The CBM enrichment areas tend to be located in zones of poorly developed limestone and well-developed mudstone. In addition, the gas content of the Shanxi Formation is higher in the coa

关键词： depositional environment coalbed methane enrichment condition gas content Taiyuan Formation Shanxi Formation

Identification of Milankovitch Cycles and Calculation of Net Primary Productivity of Paleo-peatlands using Geophysical Logs of Coal Seams

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Acta Geologica Sinica(English Edition) 2022年第6期96卷 1830-1841页

作者： SHAO Longyi WEN He GAO Xiangyu Baruch SPIRO wang xuetian YAN Zhiming David J.LARGE College of Geoscience and Surveying Engineering China University of Mining and Technology(Beijing)Beijing 100083China Department of Earth Sciences Natural History MuseumLondon SW75BDUK Institute of Architectural Engineering Weifang UniversityWeifangShandong 261061China Faculty of Engineering University of NottinghamNottingham NG72RDUK

Individual coal seams formed in paleo-peatlands represent sustained periods of terrestrial carbon accumulation and a key environmental indicator attributed to this record is the rate of carbon *** the rate of carbon accumulation requires a measure of time contained within the *** study aimed to determine this rate via the identification of Milankovitch orbital cycles in the *** geophysical log is an ideal paleoclimate proxy and has been widely used in the study of sedimentary records using spectral *** analyses of geophysical log from thick coal seams can be used to identify the Milankovitch cycles and to calculate the period of the coal *** considering the carbon loss during coalification,the long-term average carbon accumulation rate and net primary productivity(NPP)of paleo-peatlands in coal seams can be *** review paper presents the procedures of analysis,assessment of results and interpretation of geophysical logs in determining the NPP of paleo-peatlands.

关键词： paleo-peatlands Milankovitch cycle carbon accumulation rate net primary productivity(NPP) coal seam

Sequence stratigraphy, paleogeography, and coal accumulation regularity of major coal-accumulating periods in China

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International Journal of Coal Science & Technology 2020年第2期7卷 240-262页

作者： Longyi Shao xuetian wang Dongdong wang Mingpei Li Shuai wang Yingjiao Li Kai Shao Chao Zhang Caixia Gao Daxiao Dong Aiguo Cheng Jing Lu Congwei Ji Di Gao State Key Laboratory of Coal Resources and Safe Mining College of Geoscience and Surveying EngineeringChina University of Mining and Technology(Beijing)Beijing 100083China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590ShandongChina Innovation Technology Research Institute of Shaanxi Investment Group Co. Ltd.Xi'an 710061ShaanxiChina Shaanxi Coalbed Methane Development Company Limited Xi'an 710119ShaanxiChina China National Administration of Coal Geology Beijing 100039China College of Resources and Environment Henan Polytechnic UniversityJiaozuo 454003HenanChina

There are 9 major coal-accumulating periods during geological history in China,including the Early Carboniferous,Late Carboniferous-Early Permian,Middle Permian,Late Permian,Late Triassic,Early-Middle Jurassic,Early Cretaceous,Paleogene and *** coal formed in these periods were developed in different coal-accumulating areas(CAA)including the North China,South China,Northwest China,Northeast China,the Qinghai–Tibet area,and China offshore *** this paper,we investigated depositional environments,sequence stratigraphy,lithofacies paleogeography and coal accumulation pattern of five major coal-accumulating periods including the Late Carboniferous to Middle Permian of the North China CAA,the Late Permian of the South China CAA,the Late Triassic of the South China CAA,the Early-Middle Jurassic of the North and Northwest China CAA,and the Early Cretaceous in the Northeast China *** to distribution of the coal-bearing strata and the regional tectonic outlines,we have identified distribution range of the coal-forming basins,sedimentary facies types and coal-accumulating *** sequence stratigraphic frameworks of the major coal-accumulating periods were established based on recognition of a variety of sequence *** distribution of thick coals and migration patterns of the coal-accumulating centers in the sequence stratigraphic framework were *** lithofacies paleogeography maps based on third-order sequences were reconstructed and the distribution of coal accumulation centers and coal-rich belts were predicted.

关键词： Coal-accumulating period Coal-accumulating area Sequence stratigraphy Paleogeography China

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平坦地面条件下装备间天线电磁耦合度分析

电波科学学报 2015年第4期30卷 814-819页

作者：王伟王学田王文宋崧李名游陈磊北京理工大学信息与电子学院北京100081 中国人民解放军装备学院北京101416

分析了地表面反射系数以及地面土壤介质的介电特性,研究了车体结构对天线辐射特性的影响,仿真得到了车体模型、地面介质、距离等因素对天线间耦合度的影响,建立了平坦地面条件下,通信车的收发天线间电磁耦合度的精确的仿真模型.经与实... 详细信息

分析了地表面反射系数以及地面土壤介质的介电特性,研究了车体结构对天线辐射特性的影响,仿真得到了车体模型、地面介质、距离等因素对天线间耦合度的影响,建立了平坦地面条件下,通信车的收发天线间电磁耦合度的精确的仿真模型.经与实测数据对比分析,仿真结果与实测数据变化规律一致,最大误差16.54dB,均方差4.21dB.

关键词：反射系数介电特性平原地貌电磁耦合度

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一种甚高频中心和带宽可调耦合滤波器设计

电波科学学报 2013年第2期28卷 285-289页

作者：房丽丽王学田刘春明北京理工大学信息与电子学院北京100081

针对两种典型的电调谐耦合滤波器结构,研究了在滤波器中心频率改变时如何保持滤波带宽恒定的问题.采用LC集总元件,考虑实际元件的寄生效应,提出了VHFL频段中心频率和带宽可调的双调谐耦合滤波器结构。仿真结果表明:该滤波器在56.9～165.... 详细信息

针对两种典型的电调谐耦合滤波器结构,研究了在滤波器中心频率改变时如何保持滤波带宽恒定的问题.采用LC集总元件,考虑实际元件的寄生效应,提出了VHFL频段中心频率和带宽可调的双调谐耦合滤波器结构。仿真结果表明:该滤波器在56.9～165.8MHz的可调范围内,电路频率选择性能良好,且矩形系数(30dB/3dB)小于7,保持接近常数的带宽.实际电路的测试结果验证了设计的有效性.

关键词：电调谐耦合滤波器变容二极管

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被动毫米波成像系统的发展状况及其关键技术

科技导报 2011年第19期29卷 74-79页

作者：宋崧王学田邓甲昊北京理工大学机电工程与控制国家级重点实验室北京100081

毫米波对大气具有良好的穿透性并能提供较好的角分辨率,因此被动毫米波(PMMW)成像技术越来越受到重视。为科学设计PMMW成像系统,本文在分析被动毫米波成像原理、系统组成及辐射特性的基础上,重点阐述了国内外被动毫米波成像的最新进展... 详细信息

毫米波对大气具有良好的穿透性并能提供较好的角分辨率,因此被动毫米波(PMMW)成像技术越来越受到重视。为科学设计PMMW成像系统,本文在分析被动毫米波成像原理、系统组成及辐射特性的基础上,重点阐述了国内外被动毫米波成像的最新进展及关键技术,包括主要器件、系统和信号处理方法等,并提出了被动毫米波成像的发展方向和应用领域。

关键词：被动毫米波成像辐射计焦平面微波单片集成电路

基于云模型和累积前景理论的山区铁路绿色低碳线路优选

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铁道科学与工程学报 2024年第9期21卷 3822-3830页

作者：丁天贵谭衢霖王雪甜谭浩银秦晓春北京交通大学土木建筑工程学院北京100044 北京交通大学线路工程空间信息研究所北京100044

铁路作为一种绿色的交通方式,在我国的交通强国战略和双碳目标中扮演重要角色,开展绿色低碳研究势在必行。铁路选线设计统领项目全局的阶段,对后续的建设、运营具有决定性作用。然而,设计比选易受到专家和决策者的影响,专家评价存在不... 详细信息

铁路作为一种绿色的交通方式,在我国的交通强国战略和双碳目标中扮演重要角色,开展绿色低碳研究势在必行。铁路选线设计统领项目全局的阶段,对后续的建设、运营具有决定性作用。然而,设计比选易受到专家和决策者的影响,专家评价存在不确定性和模糊性,而决策者存在主观偏好,难以定性评判方案优劣。此外,项目初期需要反复修改优化设计方案,难以获得全面的方案数据,而目前贯彻绿色低碳理念的选线设计研究较少,缺少相应的工程案例做参考,定量描述线路设计低碳设计水平存在挑战。为了解决上述问题,提出一种基于云模型和累积前景理论的山区铁路绿色低碳线路设计优选方法。结合山区铁路特征和绿色低碳设计理念构建评价体系,用熵权法和CRITIC法获取指标权重。采用云模型综合考虑专家评语中的不确定性和模糊性,借助累积前景理论考虑决策者的主观偏好。提出在设计阶段估算铁路线路碳排放量和车站光伏发电潜力的公式,实现了对线路低碳设计水平的定量描述。以中老铁路孟阿至班普亚一段为例进行分析,所得结论与专家一致,验证了方法的有效性。这将为山区铁路线路设计提供决策支持,为交通碳排放计算和光伏潜力评估提供一种新的思路,有助于我国的绿色低碳转型和经济高质量发展。

关键词：铁路选线云模型累积前景理论中老铁路绿色低碳

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滇东北地区煤层气富集特征及勘探目标优选

天然气工业 2018年第9期38卷 17-27页

作者：邵龙义王学天张家强侯海海唐跃王巨民林玉成中国矿业大学(北京)地球科学与测绘工程学院中国地质调查局油气资源调查中心云南省煤炭地质勘查院云南省煤田地质局

滇东北地区镇雄—威信煤田上二叠统赋存丰富的煤炭及煤层气资源,具有良好的煤层气勘探开发前景。为了加快对该区煤层气资源的勘探开发步伐,通过调研前期煤田勘查及煤层气地质勘探资料,从含气性、煤层分布、煤岩煤质、含煤岩系岩性组合... 详细信息

滇东北地区镇雄—威信煤田上二叠统赋存丰富的煤炭及煤层气资源,具有良好的煤层气勘探开发前景。为了加快对该区煤层气资源的勘探开发步伐,通过调研前期煤田勘查及煤层气地质勘探资料,从含气性、煤层分布、煤岩煤质、含煤岩系岩性组合等方面研究了煤层含气量、甲烷浓度与煤层厚度、埋藏深度、煤岩煤质及顶底板岩性等参数之间的关系,分析影响煤层气富集成藏的主要因素,在此基础上建立了基于多层次模糊数学的煤层气选区评价模型,并对该区进行了煤层气有利区评价。结果表明:(1)煤层气富集主控因素为煤层厚度、煤层埋深和顶底板保存条件;(2)优选出资源潜力、储层性能、保存条件和开发条件等4个方面共计11项三级评价参数作为煤层气勘探目标评价的指标;(3)煤层气选区评价模型的评价结果显示,新庄矿区的煤层气勘探开发潜力为最好,洛旺、牛场—以古、马河次之。结论认为,该研究成果可为滇东北地区下一步的煤层气勘探开发工作提供地质依据。

关键词：滇东北晚二叠世煤层气富集特征层次分析方法评价参数有利区优选新庄矿区

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再论中国含煤岩系沉积学研究进展及发展趋势

沉积学报 2017年第5期35卷 1016-1031页

作者：邵龙义王学天鲁静王东东侯海海中国矿业大学(北京)地球科学与测绘工程学院北京100083 山东科技大学地球科学与工程学院山东青岛266590

过去30年间,在层序地层学及旋回地层学等沉积学理论引入中国后,中国学者在含煤岩系沉积学研究方面取得了长足的进步,相继提出幕式聚煤作用、海侵过程成煤作用、海侵事件成煤作用以及超厚煤层的多阶段泥炭地叠加成因模式等基于层序地层... 详细信息

过去30年间,在层序地层学及旋回地层学等沉积学理论引入中国后,中国学者在含煤岩系沉积学研究方面取得了长足的进步,相继提出幕式聚煤作用、海侵过程成煤作用、海侵事件成煤作用以及超厚煤层的多阶段泥炭地叠加成因模式等基于层序地层学理论及可容空间概念的聚煤模式,并将可进行区域对比的等时性地层单元(层序)与传统岩相古地理研究相结合,重建中国各聚煤期等时性岩相古地理,进行富煤带及聚煤中心迁移规律分析。随着煤层气及煤系页岩气等非常规天然气勘探的不断深入,煤相及沉积有机相研究作为煤及泥质岩生烃潜力评价的重要方法重新受到关注。"含煤系统"概念将含煤盆地中各种地质信息进行融合与集成,包括古泥炭堆积的原始特征、含煤岩系的地层格架及煤层丰度、煤中硫含量与分布特征、煤变质程度或煤阶等。近年来,煤层作为"深时"古气候信息的载体,成为当前研究热点之一,特别是煤中丝质体含量可用来研究古泥炭地火灾事件及大气氧含量变化,米兰科维奇旋回理论作为一种有效的"深时"时间尺度度量方法,可用来研究古泥炭地的碳聚集速率及其所反映的净初级生产力与大气CO2变化趋势。未来含煤岩系沉积学将会进一步加强研究不同构造背景下的含煤岩系层序地层格架样式、层序地层格架下的优质煤炭资源与煤系非常规天然气资源预测模式,以及煤层在地球长、短周期气候变化旋回中的地质意义。

关键词：含煤岩系煤炭资源沉积学超厚煤层的多阶段泥炭地叠加成因模式 "深时"古气候发展战略