煤与瓦斯突出预报的模糊聚类相似分析法   总被引：6，自引：1，他引：6  

秦书玉 《中国地质灾害与防治学报》2003,14(4):58-61

影响煤与瓦斯突出的因素多数是定性的或是模糊相似，采用模糊聚类分析方法对煤炭与瓦斯突出程度进行分析，建立模糊模式；应用模糊相似选择原理进行评价，以模糊模式为评价对象，以待预报样本为参考对象，根据模糊模式与以待预报样本的相似程度进行预测预报。哪一模式与预报样本最相近，等待预报样本即属于那一突出类型。采用模糊聚类及模糊相似原理2种方法结合分析预测，不仅克服了模糊聚类单一分析方法的不确定性，使定性预报转为定量预报，而且提高了预报效果的准确程度。实例分析表明，这是预报煤与瓦斯突出危险程度的一种较好的方法。  相似文献   

试论河南省济源西部煤田地质特征及找矿方向          下载免费PDF全文

孙越英聂怀耀  刘志如卢耀东 《甘肃地质》2007,16(1):44-49

煤是国家高度重视和急需勘查开发的重点能源矿种，后备资源的充足与否，事关国家能源安全。济源西部地区有大面积的石炭、二叠系含煤地层分布，并且含煤层数多，煤层较为稳定，具有较好的找矿前景。通过对济源西部地质特征、煤田聚煤作用、煤系地层及埋藏条件的分析，提出了在该区的找煤方向。  相似文献   

自动气象站采集器显示板维修经验     

Xu Yuanyuan  Xie Jun 《河南气象》2007,(Z1)

根据ZQZ-CⅡ型自动气象站采集器的显示板的工作原理及维修实际经验,介绍了维修显示板的基本方法及主要芯片的性能,并对典型故障进行举例分析。  相似文献   

Traditional horticultural and gathering practices in two semi-rural populations of Northwestern Patagonia     

《Journal of Arid Environments》2013

Horticultural and gathering practices were studied in Comallo and Pilcaniyeu, two semi-rural communities which share a common Mapuche ancestry and occupy similar arid environments in Northwest Patagonia, Argentina. We analyzed cultivation and wild plant gathering using semi-structured interviews. We hypothesized that these activities will be conditioned by access to market economy. Results showed differences in horticultural and gathering patterns in both populations: the community with less access to market economy presented greater richness of cultivated and gathered species and collected more seeds from their own harvests, thus promoting germplasm conservation and higher levels of seed exchange than the community that had more contact with urban centers. In these populations the integration of ancestral and novel knowledge seems to favor flexibility and autonomy, which might help locals deal with change. This could foster greater individual and collective wellbeing, as well as socio-ecological diversity.  相似文献   

温州海洋旅游区位特征与吸引力分析   总被引：2，自引：0，他引：2  

苏北春 《地理科学》2008,28(3):452-456

温州海洋旅游资源丰富,种类较为齐全,其区位特征是优势资源集中于海岛。由于温州海洋旅游资源禀赋价值总体上低于内陆性旅游资源,特别是近海岸海洋环境问题的影响,因而使海洋旅游的发展受到了很大制约。作为区域性的海洋旅游中心地,温州海洋旅游无论是资源区位还是客源区位明显处于一种被"边缘化"了的劣势,客源地与海洋旅游地之间属于内陆性风景名胜区与海洋旅游地的间接关联。因此,温州海洋旅游吸引力的形成,必须借助于各种旅游资源和产品所产生的聚合效应,特别是要借助于温州经济的巨大品牌效应。  相似文献   

掺水工艺实施后存在问题及解决办法     

李岳栋  曹进仁  刘之泉 《海洋地质译丛》2008,(3):65-69

2007年1月，腰滩油田全面实施掺水工艺。工艺实施初期，因原油物性差、油井分散、单井产量低、新井生产无水采油周期短、油井产液含水率上升快等导致了掺水量过大的问题，使站区日处理液量增加、原油销售超标，严重影响油田的正常生产。为保证掺水工艺在腰滩油田的顺利实施，依据掺水理论，结合油田实际，通过现场简化流程、完善加药方式、制定合理工作制度等措施，使掺水工艺在该油田得到了正常运行，达到了生产稳定、节能降耗、提高经济效益的目的。  相似文献   

Research Progress in Shale Nanopores     

Zhang Panpan  Liu Xiaoping  Wang Yajie  Sun Xuejiao 《地球科学进展》2014,29(11):1242-1249

With the rise of shale oil and gas exploration and great success of North American shale oil and gas development in recent years, the study of gas shale reservoir pores gets more and more attention. The pore diameters of shale reservoirs are mainly in nano-scale which are different from conventional reservoirs, and they can not be evaluated by conventional methods. On the basis of the research on the classification of shale pore types and nanopore characterization techniques, qualitative and quantitative nanopore characterization methods were classified and summarized. In addition, the advantages and disadvantages of various methods as well as application scopes were summarized. Qualitative characterization methods can obtain the morphologic information, connectivity and filling conditions of shale pores directly by focused ion beam milling scanning electron microscopy, field emission scanning electron microscopy, transmission electron microscopy, broad ion beam scanning electron microscope, atomic force microscope and Nano-CT. Quantitative characterization methods can measure pore diameters, pore distribution and specific surface area by nitrogen adsorption experiments, carbon dioxide adsorption experiments, mercury injection experiments, small-angle neutron scattering, and nuclear magnetic resonance. The factors that control nanopore developments and the effects of nanopore on shale gas accumulation were discussed. The nanopore developments are related to total organic carbon content, clay minerals content, carbonate content and thermal maturity. Nanopores have influences on shale gas storage capacity, occurrences of shale gas and seepage mechanisms. Frontier research and development directions were proposed. In the aspect of nanopore characterization techniques of shales, the accuracy and efficiency of the experiments and three dimensional imaging technology should be improved constantly. Qualitative and quantitative characterization techniques should be combined. As to the evaluation of shale nanopore reservoirs, the factors that control nanopore developments, shale gas storing and producing and nanopores characterization and evaluation of continental heterogeneous shale are the key issues for further research.  相似文献   

P－SV转换波的一种处理方法─叠前抽道集法   总被引：1，自引：0，他引：1  

严寿民  陈静 《地球物理学进展》1995,(4)

本文利用纵波和横波的迭加速度资料来计算Ｐ－ＳＶ波勘探中转换点的近似位置。再按转换点对Ｐ－ＳＶ波重新抽道集，得到可与反射资料ＣＭＰ道集相兼容的时间剖面图。利用理论模型对上述方法进行了可靠性检验，并用该方法对实际资料作了处理。同时还得到了实际资料的Ｐ波和Ｐ－ＳＶ波的彩色振幅比剖面图。结果表明：采用改进的叠前抽道集法所得到的剖面图具有很好的空间分辨率。  相似文献   

断层土壤气采气率对气氡观测结果影响的实验研究     

李桂清  吴学瑜  刘兆友  韩久英  马艳华 《华北地震科学》2010,28(2):32-36

地震前兆观测是地震预报的基础。地震流体前兆观测在水资源过度开采的形势下,发展断层土壤气观测成为必然趋势。但地下流体观测技术规范未给出断层土壤气观测的集气-采气装置及采气条件的具体参数,而这些参数正是影响观测结果的重要因素。因此,本文对断层土壤气气氡观测的采气条件进行了实验研究及分析。结果表明,当日采气量一定时,集气室体积的大小对观测结果有较大影响。运用"采气率"这个概念来定量衡量断层土壤气观测装置系统的实用效果。集气室有效体积的大小应根据日采气量的多少来确定,采气量越大,集气室有效体积应越大,结合地震前兆观测实际,采气率应接近于1。本文实验研究结果对规范断层土壤气气氡观测提供了科学依据,也可供其它气体观测参考。  相似文献   

遥感油气勘探对伊犁盆地的评价   总被引：3，自引：0，他引：3  

陶国强  熊介凡 《现代地质》1997,11(4):529-535

遥感油气勘探技术是通过遥感影像的构造解译及烃类微渗漏信息的提取并结合其他地质资料，对目标区进行油气有利聚集区的预测及评价。利用这一勘探技术着重对伊犁盆地的构造特性、承压盆地、构造阶地、烃类微渗漏信息等进行了解译和提取，总结出伊犁盆地油气藏预测的九大要素，确定了３条油气聚集带和１４个油气远景区。  相似文献