龙湾井田3号煤层煤层气赋存的地质控制因素

从构造、煤层围岩特征、煤层埋深和水文地质条件4个方面,探讨了龙湾井田3号煤层煤层气赋存的地质控制规律。结果表明:煤层气含气量在不同褶曲部位有所差异,沿向斜轴部往深部方向延伸,煤层气含量明显增高;煤层埋深对煤层气含量的控制作用明显,围岩特征影响相对较弱;地下水条件对煤层气赋存也具有一定的控制作用。     

赵官煤田煤层气赋存特征及其控制因素研究

基于岩浆活动对煤层气赋存的影响,为得出丰富岩浆活动对煤层气富集作用机理的控制规律,在对赵官煤田煤层气资料、构造条件、煤层灰分、顶底板岩性、煤层埋深、水文地质条件和岩浆活动分析之上,对赵官煤田煤层气赋存特征及其控制因素进行了研究。结果表明:上组煤(7煤、10煤)煤层气含量、含气饱和度明显大于下组煤(11煤、13煤);煤层气赋存影响不明显;煤层灰分与煤层含气量呈负相关;上组煤顶底板岩性致密,完整性好,利于煤层气保存,下组煤顶板受岩浆岩侵入,完整性相对较差,利于煤层气逸散;煤层含气量与煤层埋藏深度正相关,上、下组煤含气量梯度分别为3.67、0.53 m~3/(t·hm);地下水滞水区矿化度高,利于煤层气的保存;岩浆岩附近煤层中煤层气逸散严重,是导致上下煤层含气量相差较大的根本原因。     

新疆阜康矿区煤层气开发地质条件分析

阜康矿区煤层气地质条件中等,且随埋深明显形成分区,文章从地层、构造、煤层、煤质、烧变岩、水文地质条件进行分析,总结阜康矿区煤层气赋集规律,提出如下观点;阜康矿区煤储层条件与沁水、保德等国家煤层气基地储层条件有明显的差异,最大不同在于地层产状,沁水、保德盆地煤系产状平缓,而阜康矿区煤储层属于大倾角煤层,煤层大倾角使煤层气在深度上形成明显分区;阜康矿区普遍古火区发育,使煤层气风化带埋深加大;阜康矿区煤层气开发有利区为：古火区发育区适合开发深度600～1000m,煤层渗透率大于1mD。     

河北省开平煤田煤层气成藏条件浅析

从煤系的沉积、埋藏、煤的演化生气以及气藏的改造定型等方面分析了河北省开平煤田煤层气的形成与演化过程，进而对煤层气藏特征及煤层气富藏条件进行了剖析。开平煤田整体上为一不对称向斜构造，聚煤作用和后期沉积对煤层气藏的形成演化比较有利，煤层气富集成藏的生气、储气及保存条件具备，主要成藏目标煤层7、8、9、12号煤层厚度大且分布稳定，尤其向斜的西北翼成藏条件较好，可作为有利区优先安排煤层气勘查工作。     

新疆阜康白杨河矿区煤层气成藏条件及控藏效应

通过对矿区地质条件的研究,分析了沉积作用、构造动力条件、变质作用、煤层自燃及水文地质条件对矿区煤层气富集成藏的控制与影响。沉积作用、构造动力条件为煤层气藏的形成创造了较好的生气层、储集层和盖层;构造活动对储层破坏程度较小,并进一步改善了储层的渗透性能;在煤变质初期阶段及受煤层自燃的影响,煤层生气量大;矿区水动力条件较差,不利于煤层气运移与扩散,使得煤层气富集成藏。     

新疆阜康矿区煤层气勘探开发方法探讨

新疆阜康矿区大倾角煤层赋存特点决定了煤储层煤层气有明显的深度分带性,参数随埋深形成明显分区;使阜康矿区煤储层条件成为全国煤层气主产区(平缓倾角如沁水、保德外不同的类型),在勘探开发中对此进行有效的控制,是新疆煤层气开发必须要解决的问题,本文提出煤层气勘探开发应坚持采用煤田勘探方法的思路,提出对大倾角煤层煤层气勘探方法与平缓倾角煤层煤层气勘探方法应有不同,平缓倾角煤层煤层气勘探一般网格法布孔,大倾角煤层煤层气勘探则采用剖面线法布孔,应当根据地层、构造、煤层、煤质、烧变岩、水文地质条件进行综合分析,合理灵活布设孔位,保证煤层气开发的经济性,实现新疆煤层气产业的良性发展。     

深煤层煤层气开发有效途径展望

我国深煤层煤层气资源量巨大,埋深在1000～2000m的煤层气资源量占2000m以浅资源总量的61％。由于深煤层所具有的“高温、高地应力、高孔隙压力、低渗透率”特殊的地质条件和储层物性,与浅煤层相比,深煤层储层物性特征较差,目前我国煤层气开发主要集中在浅部,随着勘探工作的不断深入,对深部的勘探已大势所趋。但仍缺乏系统的研究成果;与浅煤层相比,特殊的地质条件使得适用于浅煤层煤层气的开发技术不能直接应用于深煤层煤层气开发。鉴于深煤层储层的独特特点,注CO2提高采收率增产技术、煤层气与煤系地层砂岩气共采技术将是提高深煤层煤层气井产气能力的有效途径。     

柳林区块多煤层含气性差异与煤层气成藏模式

基于柳林地区山西组与太原组煤层含气性差异特征,以保存条件为重点,从煤层顶板岩性和水文地质条件2个方面,剖析了2组煤层含气性差异控制因素,总结了2组煤层气成藏模式。研究表明,煤层顶板岩性和水动力条件共同控制了该区2组煤层含气性的差异。山西组煤层含气量和甲烷浓度总体高于太原组煤层;太原组煤层二氧化碳浓度偏高,甲烷碳同位素偏轻;山西组煤层顶板为弱含水泥岩和砂岩,有利于煤层气富集;太原组煤层顶板为强含水灰岩,不利于煤层气富集。在活跃的水动力条件下,太原组煤层碳同位素分馏作用和甲烷与二氧化碳间的碳同位素交换作用,是造成太原组煤层二氧化碳浓度偏高、甲烷碳同位素偏轻的根本原因。研究认为,山西组煤层气藏为气压封闭型气藏,太原组煤层气藏为水力封闭型气藏。     

湖南省煤层气开发现状、问题与对策

湖南省煤层气赋存较为丰富,但抽采量很小.分析了湖南省煤层气抽采利用现状及存在的问题,提出了加快湖南省煤层气产业发展,有效减少瓦斯事故的政策建议.认为,湖南煤层特点是透气性低,抽采困难,应引进国外先进技术,提高煤层透气性;组织科技攻关,开展煤层地质条件下煤层气抽采技术研究;利用多种抽采方法,大幅度提高煤层气产量;选择条件适宜的县区,开展地面煤层气抽采试验研究.     

黔西织纳煤田少普矿区16号煤煤层气富集的地质控制因素

从构造、煤层厚度、煤层埋深和水文地质条件4个方面探讨了少普井田16号煤煤层气富集的地质控制规律。结果表明：现今煤层含气量的分布规律体现出褶皱控气的特征,其含气性在不同褶曲部位有所不同;煤层气含量受煤层厚度和煤层埋深的的影响也比较明显,煤层厚度与含气量、煤层埋深与含气量均呈现出一定的正相关性;同时,矿区地下水条件对煤层气也具有良好的封闭作用。通过配置分析各地质因素表明：矿区中部区块地质构造发育、煤层厚度大、埋藏深度大、地下水动力弱有利于煤层气的富集。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586