煤系地层中铁质矿物微观特征研究     

解光新  王晓梅庄军 《中国煤田地质》2004,16(6):12-13,54

通过对煤系地层中菱铁质鮞粒内部结构构造和黄铁矿、白铁矿微晶特征的研究，探讨了其生成的地球化学条件、形成机理，为地层对比、沉积地球化学条件的恢复等提供了依据。并对煤炭资源的勘探开发和利用具有实用意义。  相似文献   

黄陵二号井煤层开采对水源地影响     

赵岩 《中国煤田地质》2004,16(6):16-18,57

黄陵二号井开采煤层能否引起上畛子及百药沟水源地破坏是一个重要的环境地质问题，倍受业内人士的关注，但目前观点仍不统一。依据地质勘探资料，运用水文地质学相关理论，在分析井田水文地质特征及直罗组上段隔水性能的基础上，通过导水裂隙带最大高度计算，得出了煤层开采对水源地无影响的结论，并提出了矿井建设期间应注意的事宜。  相似文献   

煤电钻技术在探放老空水中的应用     

才向军 《中国煤田地质》2004,16(Z1):48-49

通过 对采 空区 积 水规 律的 分 析与 研究 ,提 出在 积 水采 空区 下 沿空 掘进 采 用煤 电钻 探 放水 技术 及 方法 ,解 决了钻 机探 放 水的 塌孔 问 题,既保 证了 沿 空掘 进的 安 全,又 取 得了 较大 的 经济 效益 。  相似文献   

Environmental and tectonic influences on the formation and distribution of carbonate nodules above the Springfield coal seam, southern Illinois Basin     

S.E. Phillipson 《International Journal of Coal Geology》2005,64(3-4):239-256

Carbonate nodules have been encountered for many years in the southern Illinois Basin, in parts of southern Illinois, southern Indiana, and southwestern Kentucky. The nodules occur as oblate spheroids of calcium carbonate that are isolated in the shale immediate roof of coal mines. They are common in the Springfield coal seam, known as the No. 5 seam in Illinois, and as the No. 9 seam in western Kentucky. Several different mechanisms have been proposed for the formation of various semi-spherical objects in coal measure rocks. The distribution and association with rooted horizons suggest that carbonate nodules in black fossiliferous shale observed in the roof of a studied mine in the Springfield seam represent pedogenic carbonate paleosols, which formed in a caliche-favoring environment subsequent to Springfield mire deposition. This interpretation is supported by ⁸⁷Sr/⁸⁶Sr isotope ratios of 0.710893 ± 13 to 0.711035 ± 12, which indicate a freshwater rather than seawater source.Petrographic examination of rock textures and mineral grains indicates that nodules collected from two Illinois Basin coal mines are composed of subangular grains of fine-grained, crystalline microspar. Although the carbonate is not ferroan, iron hydroxide stains interstices between microspar grains. The rounded, commonly pinched boundaries of nodules truncate commonly imbricated microspar grains. In contrast, concentric growth patterns are not observed except as defined by secondary, subhedral to euhedral pyrite crystals that form a diffuse, concentric replacement zone around the nodule's outer rind. Polished slickensides, with well-developed radial slickenlines, are developed at highly compacted margins in black shale or mudstone that commonly encases the carbonate nodules.Of the 450 carbonate nodules documented at a study mine in the southern Illinois Basin, the long axes of 36% are preferentially aligned parallel to regional structures such as anticline axes and drag folds that are interpreted to have formed in response to compression during the Late Pennsylvanian-Permian Alleghanian orogeny. Mapping also suggests that clusters of carbonate nodules are spatially associated with the trends of low-angle drag folds in the immediate roof of the Springfield seam at the study mine. The preferential elongation and distribution with respect to tectonic structures suggest that regional compression influenced the shape and distribution of carbonate nodules, and that nodule lithification may have been approximately contemporaneous with regional deformation.  相似文献   

The Cenozoic Lower Rhine Basin – rifting, sedimentation, and cyclic stratigraphy     

A. Schäfer  T. Utescher  M. Klett  M. Valdivia-Manchego 《International Journal of Earth Sciences》2005,94(4):621-639

In the Cenozoic, the Lower Rhine Basin formed as a rift at the southeastern terminus of the Dutch German Central Graben, while the Rhenish Massif was uplifted. The study focusses on the marginal marine and fluvial fill of the Lower Rhine Basin. A basin model is developed. Support for this study was given by extensive industry outcrop and well data, by new stratigraphical and sedimentological observations. The ingression and subsequent regression of the Cenozoic North Sea is analysed using the concept of base level cyclicity. As the geohistory of the basin was complex, a subsidence curve is constructed. Furthermore, an attempt is made to trace the simultaneous uplift of the Rhenish Massif.  相似文献   

陕北石炭二叠纪煤田吴堡矿区横沟井田勘查深孔施工技术     

曲文杰 《陕西地质》2005,23(2):108-112

本文阐述了通过采用合理的钻孔结构、钻具级配、钻进参数、泥浆配方，特别是采用不同的堵漏工艺，解决了吴堡矿区横沟井田勘查复杂地层深孔钻探施工的技术难题。  相似文献   

煤田三维地震数据处理中方差体 技术的参数优选及应用效果     

张新红  蒋传琳  刘卫  尚照顺 《物探与化探》2006,30(5):450-452,455

方差体技术是基于统计学原理,利用三维地震数据体中相邻道之间地震信号的相关性计算样点的方差值,提取数据体中不连续信息,用以识别小断层和陷落柱等岩性变化点。笔者以山西某煤矿采区为例,通过方差体各项参数的测试,介绍方差体的运算模式、运算道数和时窗大小等参数对计算成果的影响,使方差体技术在确定煤层小断层和陷落柱等地质体时取得较好效果。  相似文献   

西北地区煤炭资源及开发潜力   总被引：1，自引：5，他引：1  

陈守建  王永  伍跃中  王战  张维吉 《西北地质》2006,39(4):40-56

西北地区蕴藏着十分丰富的煤炭资源,占我国煤炭资源预测总量的76.46%。含煤盆地主要有鄂尔多斯、准噶尔、吐哈、塔北等。其中,鄂尔多斯煤盆地是具有稳定克拉通基底,沉积了石炭一二叠纪华北型海陆交互相含煤地层和三叠一侏罗纪内陆河流一湖泊型陆相含煤地层的双纪巨型含煤盆地;准噶尔煤盆地、吐哈煤盆地、塔北煤盆地是具有稳定陆块基底的侏罗纪内陆湖泊含煤盆地;伊犁煤盆地、尤尔都斯煤盆地、焉誉煤盆地和库米什煤盆地是具有天山华力西期摺皱带基底的山间断陷(坳陷)型含煤盆地;走廊煤盆地群是具有祁连加里东褶皱带基底的山间断陷(坳陷)型含煤盆地.阿拉善地块、柴达木地块晚古生代和中生代亦具备成煤的古地理条件,目前已在柴达木地块北缘和阿拉善地块南缘发现了小型煤盆地群。地块主体为沙漠覆盖,勘探程度低,可作为西北地区煤炭资源的后备潜力区块。 据国家煤炭工业局1998年统计,西北地区煤炭资源保有储量为4035.35X10~8t,其中生产井和在建井保有储量为752.24X10~8t。尚未利用的精查储量为187.69X10~8 t,可供进一步勘探的详查储量为510. 51 X 108 t >普查和找煤储量为2550.91X108t,煤炭资源储量丰富。我国2002年煤炭消费达到13.69XlO~8t. 2003年17.36X10~8t, 2004年达19X10~8t,而西北地区煤产量在全国所占比例甚小,根据中国煤炭工业协会对2004年1月统计,全国煤矿合计原煤产量为11170.75X10~4t,其中西北地区为1585.17X10~4t(内蒙古按全区产量的2/3计算),只占14.19%,西北地区煤炭资源开发潜力巨大。  相似文献   

在我国发现的Schwertmannite矿物及其特征   总被引：5，自引：1，他引：5  

孙红福  赵峰华  丛志远  岳梅  任德贻 《矿物学报》2006,26(1):38-42

采用X射线衍射(XRD)、扫描电镜与能谱(SEM-EDX)、X射线荧光(XRF)、傅立叶红外光谱(FT-IR)、热分析(DTA-TG)等分析方法,在我国山西马兰煤矿的酸性矿坑排水(AMD)沉淀物中首次发现了“斯沃特曼铁矿”(Schwertmannite)。研究表明,山西马兰煤矿酸性矿坑排水沉淀物中的Schwertmannite矿物的粒径为0.3~70μm,且分布比较均匀,其BET表面积为44.065 0 m2/g;SEM二次电子像显示为球形或椭圆形(聚集体)结构,颗粒大小比较均匀,球的表面有针状毛刺;该矿物的化学式为Fe8O8(OH)4.52(SO4)1.74.4.73H2O。  相似文献   

改性煤系高岭土矿粉填充橡胶的结构与性能   总被引：4，自引：0，他引：4  

赵鸣  李书同  何素芹  朱诚身 《矿物学报》2006,26(1):113-117

以煤系高岭土为主要原料通过相对富集,超细粉碎、表面改性处理等方法,得到一种橡胶填充剂MUCKP。用它代替通用炭黑作为橡胶的补充填充剂,制备了胶片,对填充后的橡胶进行了应用性能研究。结果表明:用于天然橡胶时,当填充剂粒度小于400目时,已有较好的补强作用,其主要性能指标类似于通用炭黑,可以部分等量替换碳黑作为橡胶的补强填充剂。取代量在20%~25%之间。  相似文献