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从福建省天湖山煤矿区二叠纪煤系所处的聚煤环境和煤矿区经过后期印支运动和燕山运动改造的区域构造背景入手,通过分析构造特征及其含煤性,并结合近年来在隐伏区下找煤(火山岩与岩体下找煤、推(滑)覆体下找煤)的成功实例分析,圈定了曾坂、西坑、尾厝和天湖山深部等四个隐伏找煤远景区,指出该区域下一步找煤方向。 相似文献
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湖南省煤田主要有地台型和地洼型两类。地台型煤田主要为斗岭煤系,次为测水煤系,煤系地层以海陆交互相细碎屑岩为主,含菱铁矿或黄铁矿结核,煤系厚2—44m,含煤l—3层,煤系地层与下伏岩层为整合或假整合关系。地洼型煤田主要为石门口煤系,煤系地层以陆相杂色粗碎屑岩为主,含泥岩、菱铁矿,煤系厚19—948m,含煤1—11层,煤系地层与下伏岩层呈不整合接触。全省煤炭尚可供建井的储量仅为保有储量的2l％,要加强煤炭资源的寻找,其方向一是在已知煤矿深部找煤,二是在地洼阶段形成的逆掩断层和飞来峰下找隐伏煤,三是在白垩系或下第三系下找煤。 相似文献
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安徽省淮北煤田的许疃井田,含煤地层厚度变化大,山西组下部10煤层在南部大面积缺失,下石盒子组7煤层在北部和西部分叉等地质成因问题,长期悬而未决。笔者系统分析了井田内的大量资料后发现,含煤地层的沉积始终受基底隐伏断裂的控制,由于水平挤压或垂直升降运动所产生的构造分异作用,影响到井田内地层厚度、岩性、岩相、含煤性等的差异。 相似文献
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顺和西煤矿区地温特征及其影响因素分析 总被引：1，自引：0，他引：1
顺和西煤矿区属华北地台型含煤沉积、石炭、二叠系为其主要含煤地层,山西组的二：煤层为主采煤层,埋深585～1585m。由于永城隐伏背斜两翼发育的次级宽缓褶曲及其高角度断层,控制着本区含煤地层的分布,故该矿区的地温亦受各种地质因素的作用与控制,表现为同一水平地层越老温度越高,背斜轴部地温和增温率均高于向斜轴部;中北部地温梯度较高,增温异常;南部、东北局部地温梯度较低,增温正常;地温梯度随深度的增加而减小,并在岩浆侵入地段与非侵入地段也有明显差异。地温随深度或煤层埋深的增大而增高。二：煤层除局部较浅地段为一级热害区外,二级热害区基本覆盖全区。 相似文献
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通过对龙岩煤田深部地质特征及煤系地层之上的各类盖层特征分析,从沉积环境、同沉积构造及后期构造等方面,研究其对童子岩组煤系发育的控制作用,研究其深部煤炭赋存条件及规律,通过勘查案例,提出隐伏区下找煤思路,即推覆体、滑覆体、红层、火山岩下找煤(简称"四下"找煤)。通过分析龙岩煤田隐伏区深部煤炭资源潜力,指出找煤方向,为该区煤田深部勘查和资源预测提供依据。 相似文献
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广平煤矿区属典型隐伏煤田,经历了多期次构造运动的叠加和改造,煤系地层总体呈一向斜构造,煤系地层保留的厚度在向斜边缘厚度大,往中、北部变薄甚至缺失。区内发育的广平推覆构造属于褶皱推覆构造,有倒转褶皱、“之”字形褶皱、复式背向斜褶曲和不协调褶皱等,区内断距大于20m的断层较少,5m以下的小断层和走向断层较为发育。分析认为广平推覆构造对煤层具有建设和破坏双重作用。 相似文献
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昆仑山赋煤带由东向西共分三个区段,分别为昆东煤田、布尔汉布达山区及红水河区。本赋煤带工作程度很低,目前仅在昆东煤田发现有塔妥煤矿、红土坡煤矿及苦海煤矿,均为小型煤矿,成煤时代为早—中侏罗世。其中部的布尔汗布达山地区及西部的红水河区一带虽有石炭纪及晚三叠—早侏罗世含煤地层分布,但均为人迹罕至的高山地带,地质工作程度较低。秋吉地区位于昆仑山含煤区中部,属于布尔汗布达山地区,东部为昆东煤田,西部属红水河区。秋吉地区以往有小煤窑生产,2010年该区通过实施煤炭调查后,发现该区具进一步找煤远景,初步确定本区有早、中侏罗世含煤地层,并有可采煤层赋存。通过对塔妥煤矿和秋吉煤矿点的煤矿特征对比以及对本区含煤地层沉积建造特征、煤系分布特征、地层层序特征及物探重力异常特征等分析,探讨秋吉地区找煤前景,并指出进一步找煤方向。 相似文献
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煤层对比和含煤地层剖面的对比問題是煤田地质中最重要的問題之一。正确地对比一个矿区內以及各个矿区內的含煤地层剖面和煤层是确定煤儲量,理解矿区构造,合理地将矿区划分为井田,以及查明含煤性变化規律和确定普查勘探工作方向的主要条件。在进行无岩心鑽进,以及勘探隐伏和錯动复杂的 相似文献
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KS盆地磅士卑勘查区是位于柬埔寨西南部磅士卑省豆蔻山脉东麓。该盆地构造简单,断层较少,地层总体走向为一走向NNE倾向NWW的单斜构造,地层倾角平缓。勘查区煤炭资源较丰富,含煤地层为新近系中新统,聚煤期湖沼相沉积体系。主要可采煤层为S10、S20煤层,属中灰煤至高灰煤、低硫煤至中硫煤、低发热量煤至中发热量煤。 相似文献
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《Applied Geochemistry》2001,16(11-12):1353-1360
Southwest Guizhou Province is one of the most important areas of disseminated, sediment-hosted-type Au deposits in China and is an important area of coal production. The chemistry of most of the coals in SW Guizhou is similar to those in other parts of China. Their As content is near the Chinese coal average, but some local, small coal mines contain high As coals. The highest As content is up to 3.5 wt.% in the coal. The use of high As coals has caused in excess of 3000 cases of As poisoning in several villages. The high As coals are in the Longtan formation, which is an alternating marine facies and terrestrial facies. The coals are distributed on both sides of faults that parallel the regional anticlinal axis. The As content of coal is higher closer to the fault plane. The As content of coal changes greatly in different coal beds and different locations of the same bed. Geological structures such as anticlines, faults and sedimentary strata control the distribution of high As coals. Small Au deposits as well as Sb, Hg, and Th mineralization, are found near the high As coals. Although some As-bearing minerals such as pyrite, arsenopyrite, realgar (?), As-bearing sulfate, As-bearing clays, and phosphate are found in the high As coals, their contents cannot account for the abundance of As in some coals. Analysis of the coal indicates that As mainly exists in the form of As5+ and As3+, perhaps, combined with organic compounds. The occurrence of such exceptionally high As contents in coal and the fact that the As is dominantly organically associated are unique observations. 相似文献
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推覆、滑脱构造为福建省主要控煤构造,但在其南、北两段含煤区的表现迥然不同。北段滑脱强度大,为大规模由隆起向坳陷（由西向东）逆冲的推覆构造型式,而南段滑脱强度相对较小,为两侧向向斜中部对冲的推覆构造型式。究其原因,除公认的软硬岩层相间、隆起坳陷的位能差异原因外,还认为北段的宽缓波状带、南段的向背斜序列带以及北西走滑性断裂的分割作用是造成该推覆、滑脱活动迥异的基本因素。研究这些规律,对福建省新一轮找煤工作有重要的指导作用。 相似文献
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福建省天湖山煤矿区F31推覆断层及找煤方向探讨 总被引：1，自引：0，他引：1
福建省天湖山煤矿区处于闽西南坳陷东条带,推覆构造极其发育,以F31和F1两条推覆断层表现最为突出。据矿区开采资料证实,F31断层下盘童子岩组为—总体向西倾斜向南倾伏、轴向NNE的紧密线状褶皱,断层较稀少;上盘构造复杂,断层发育,由F31所派生的低序次断层往往为逆掩或逆冲断层,与主断层面组成“入”字型构造,造成童子岩组地层多次重复,同时派生了更低序次的断层组成羽毛状构造。通过对F31推覆断层特征以及应力场分析研究,认为其演进过程为：童子岩期前后的成岩沉积—印支期侧向挤压形成褶皱—印支运动及其后由于侧向挤压形成软弱滑动面及断裂—燕山早期侧向挤压造成低角度推覆断层。根据该矿区构造研究成果,提出了矿区外围及深部的5个找煤方向。 相似文献
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Stephen F. Greb Cortland F. Eble Donald R. Chesnut Jr. 《International Journal of Coal Geology》2002,50(1-4)
More than 130 Mt of Pennsylvanian coal is produced annually from two coal fields in Kentucky. The Western Kentucky Coal Field occurs in part of the Illinois Basin, an intercratonic basin, and the Eastern Kentucky Coal Field occurs in the Central Appalachian Basin, a foreland basin. The basins are only separated by 140 km, but mined western Kentucky coal beds exhibit significantly higher sulfur values than eastern Kentucky coals. Higher-sulfur coal beds in western Kentucky have generally been inferred to be caused by more marine influences than for eastern Kentucky coals.Comparison of strata in the two coal fields shows that more strata and more coal beds accumulated in the Eastern than Western Kentucky Coal Field in the Early and Middle Pennsylvanian, inferred to represent greater generation of tectonic accommodation in the foreland basin. Eastern Kentucky coal beds exhibit a greater tendency toward splitting and occurring in zones than time-equivalent western Kentucky coal beds, which is also inferred to represent foreland accommodation influences, overprinted by autogenic sedimentation effects. Western Kentucky coal beds exhibit higher sulfur values than their eastern counterparts, but western Kentucky coals occurring in Langsettian through Bolsovian strata can be low in sulfur content. Eastern Kentucky coal beds may increase in sulfur content beneath marine zones, but generally are still lower in sulfur than mined Western Kentucky coal beds, indicating that controls other than purely marine influences must have influenced coal quality.The bulk of production in the Eastern Kentucky Coal Field is from Duckmantian and Bolsovian coal beds, whereas production in the Western Kentucky Coal Field is from Westphalian D coals. Langsettian through Bolsovian paleoclimates in eastern Kentucky were favorable for peat doming, so numerous low-sulfur coals accumulated. These coals tend to occur in zones and are prone to lateral splitting because of foreland tectonic and sedimentation influences. In contrast, Westphalian D coal beds of western Kentucky accumulated during low differential tectonic accommodation, and therefore tend to be widespread and uniform in characteristics, but exhibit higher sulfur values because they accumulated in seasonally drier paleoclimates that were unfavorable for peat doming. Hence, basin analyses indicate that many differences between the mined coals of Kentucky's two coal fields are related to temporal changes in paleoclimate and tectonic accommodation, rather than solely being a function of marine influences. 相似文献
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塔里木盆地西南部齐姆根逆冲推覆构造的特征及其与油气的关系 总被引：1，自引：1，他引：1
齐姆根逆冲推覆构造带位于喀什凹陷与叶城凹陷之间的齐姆根凸起上,由3个与盆地边缘大体平行的次级逆冲构造带组成,即阿尔塔什推覆构造带、科克然达坂-希根纳孜吉勒嘎推覆构造带、库斯拉甫推覆构造带。3个次级逆冲构造带分别将石炭系—二叠系推覆在侏罗系、白垩系及古近系—新近系之上,将泥盆系推覆在石炭系—二叠系之上,将元古宙变质岩及古生代花岗岩逆冲在泥盆系及泥盆系之上不整合覆盖的侏罗系之上。根据推覆体地层的叠置关系及逆冲断层的发育特征,齐姆根逆冲推覆构造带是由北向南演化的、后展式发展的逆冲推覆构造系统,其间发育横向调节的走滑断层。逆冲推覆体系的主体断裂沟通了源岩与储层,推覆体下盘发育的大型背斜圈闭为油气聚集提供了有利的场所,运聚条件的合理配置为该区油气勘探提供了良好的前景。 相似文献
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T.E. Repine Jr. B.M. Blake K.C. Ashton N. Fedorko III A.F. Keiser E.I. Loud C.J. Smith S.W. McClelland G.H. McColloch 《International Journal of Coal Geology》1993,23(1-4)
West Virginia is the only place in the United States where an entire section of Pennsylvanian age (Upper Carboniferous) strata can be seen. These strata occur within a wedge of rock that thins to the north and west from the southeastern part of the State. The progressive north-northwesterly termination of older Pennsylvanian geologic units beneath younger ones prominently outlines the center of the Appalachian basin of West Virginia. Over most of West Virginia, Lower and/or Middle Pennsylvanian strata unconformably overly Upper Mississippian (Lower Carboniferous) strata. Sediment deposition was accomplished by a complex system of deltas prograding north and west from an eastern and southeastern source area.More than 100 named coal beds occur within the Lower, Middle, and Upper Pennsylvanian rocks of West Virginia and at least 60 of these have been or are currently being mined commercially. Collectively, these coal beds account for original in-ground coal resources of almost 106.1×109 t (117×109 tons). West Virginia ranks fourth in the United States in demonstrated coal reserves. In 1988, West Virginia produced 131.4×106 t (144.9×106 T) of coal, third highest in the United States. Of this annual production, 75% was from underground mines. In 1988, West Virginia led the nation in the number of longwall mining sections currently in place. West Virginia's low-volatile coal beds are known worldwide as important metallurgical-grade coals, while the higher-volatile coal beds are utilized primarily for steam production. 相似文献
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《Geodinamica Acta》2013,26(1-3):127-143
The western part of the Polish Outer Carpathians is built up from the thrust, imbricated Upper Jurassic-Neogene flysch deposits. The following Outer Carpathian nappes have been distinguished: Magura Nappe, Fore-Magura group of nappes, Silesian, Subsilesian and Skole nappes. Interpretation of seismic and magnetotelluric survey from the region South of Wadowice, allows observation of relationship between basement and flysch nappes in the Outer Carpathians. It also allows identification of dislocation cutting both flysch nappes and their basement. All the Outer Carpathian nappes are thrust over the southern part of the North European Platform. The platform basement is composed of older Precambrian metamorphic rocks belonging to the Bruno-Vistulicum terrane. Sedimentary cover consists of Paleozoic, Mesozoic and Neogene sequences. The characteristic features of this boundary are horsts and troughs of general direction NW-SE, turning W-E. Faults cutting only the consolidated basement and the Paleozoic cover were formed during the Hercynian Orogeny in the Carboniferous and the Early Permian. Most of the older normal faults were covered by allochtonous flysch nappes forming thus the blind faults. During the last stage of the geodynamic development the Carpathians thrust sheets moved towards their present position. Displacement of the Carpathians northwards is related to development of dextral strike-slip faults of N—S direction. The orientation of this strike-slip fault zones zone more or less coincides with the surface position of the major faults perpendicular to the strike of the Outer Carpathian thrustsheets. The huge fault cuts formations from the Paleozoic basement through the flysch allochton between the boreholes in Sucha Beskidzka area. The displacement of nappes of the Carpathian overthrust and diapiric extrusion of plastic formations of the lower flysch units occurred along this fault. 相似文献
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黔西南高砷煤的分布及地球化学特征研究 总被引：23，自引：3，他引：20
根据野外地质特征结合中子活化成分分析结果,探讨了黔西南高砷煤的分布特征、影响因素和某些地球化学特征。高砷煤严格受构造（褶皱和断层）、地层（二叠系龙潭组）、沉积相（海陆交互相）的控制,分布于平行北斜长轴的断层两侧,愈靠近断层面砷的含量愈高。砷在煤中的分布极不均匀,即使同一煤层变化也极大。在时空关系与元素组合上高砷煤与区内卡林型金矿密切相关。 相似文献