油气藏微观不均一性及其意义   总被引：18，自引：3，他引：15  

潘长春  杨坚强 《沉积学报》1998,16(4):98-104

油气储集岩中不同孔隙类型（开放型与封闭型）中的油气组分、孔隙中自由状态的油气组分、矿物颗粒表面吸附（束缚状态）的油气组分、以及矿物内部油气包裹体之间常规生物标志化合物组成（甾、萜分布）存在明显的差异,反映了不同成藏阶段油气组成的地球化学特征,展示了油气充填过程,同时为油源对比提供了新方法。  相似文献   

湘中地区硅化岩研究   总被引：2，自引：0，他引：2  

靳西祥  靳冰晔 《湖南地质》1995,14(2):91-98

湘中地区硅化岩，产出层位多，原岩组成多样，与锑矿化关系密切，空间上，锑矿化受早期硅化控制；时间上，锑矿化主要伴随早期硅化岩中的晚期硅化产生；成因上，硅化（岩）与锑矿化之间不存在必然联系，二者之内在联系，仅在碎裂硅化岩为矿质堆积提供了良好的空间。  相似文献   

FGC－15型大直径单头潜孔锤钻具系统研制          下载免费PDF全文

蒋荣庆  殷琨  王茂森 《探矿工程》1995,(5):17-19,47

大直径单头潜孔锤与三通道气水龙头、主动钻杆、三通道钻杆、加重导正器配套，可实现大直径潜孔锤碎岩钻进、泵吸反循环排渣、泥浆护壁、压气闭路循环等相结合的先进钻进工艺，是解决大直径硬质基岩及卵砾石钻进的有效机具。文中介绍了钻具研制过程及设计内容。  相似文献   

基于Matlab的控制网平差教学软件与应用   总被引：3，自引：0，他引：3  

姚连璧  周小平 《测绘工程》2006,15(4):65-67

介绍了基于Matlab的控制网平差软件的功能和特点,并将该软件应用到《控制网平差程序设计》课程的教学过程以及实际工程的数据处理中,取得了良好的效果。  相似文献   

封闭消解-阳离子交换分离-电感耦合等离子体质谱法测定铜铅锌矿石中的铼     

熊英  吴峥  董亚妮  裴若会  刘晓艳  吴赫  张艳 《岩矿测试》2015,34(6):623-628

阴离子交换树脂已被应用于酸法消解-电感耦合等离子体质谱(ICP-MS)测定铜铅锌矿石等地质样品中铼的分离富集,样品溶液中的ReO_4~-用树脂交换吸附后再用洗脱剂将ReO_4~-选择性洗脱,该方法流程长,影响其稳定性和准确性。本文以基体元素为吸附交换目标,用8 g的732强酸型阳离子交换树脂在2%硝酸介质条件下静态吸附1.5 h,可有效地消除基体元素的影响。用空矿(石英)稀释低含量铼的样品做空白试验,获得方法检出限为0.004μg/g,精密度(RSD)小于6%,加标回收率为96%~104%。本方法应用的732强酸型阳离子交换树脂在适宜酸度条件下,对矿石中除钨、钼以外的金属元素吸附率高达95%以上,降低了样品溶液离子强度和干扰元素浓度,实现了ICP-MS的直接测定,操作方法比阴离子交换吸附法简便。  相似文献   

道路网络示意图的多边形生长算法     

张蓝  李佳田  徐珩  贺飞越  徐燕竹  王红梅 《测绘学报》2015,44(3):346-352

道路网络示意图是实体网络的抽象表示,因其更加符合人的认知习惯,在地图服务与地图制图领域已得到初步应用。以路径为单位的网络示意图自动生成算法只顾及节点与线段的局部布置,且较难以维护网络拓扑一致性。本文以闭合多边形(网眼)为基本单位,利用网眼的独立性与邻接性,提出了多边形生长算法,核心思想是将道路网络分类为闭合多边形与非闭合线段,以闭合多边形提取、映射、优化为主线,辅助组合非闭合线段。算例分析验证,本算法在网络均衡分布及拓扑一致性方面具有优势。  相似文献   

Transient electromagnetic modelling of an isolated wire loop over a conductive medium     

Marina G. Persova  Yuri G. Soloveichik  Georgy M. Trigubovich  Denis V. Vagin  Petr A. Domnikov 《Geophysical Prospecting》2014,62(5):1193-1201

A large closed wire loop is generally used in field experiments for testing airborne electrical exploration equipment. Thus, methods are required for the precise calculation of an electromagnetic response in the presence of a closed wire loop. We develop a fast and precise scheme for calculating the transient response for such a closed loop laid out at the surface of a horizontally layered conductive ground. Our scheme is based on the relationship between the magnetic flux flowing through a closed loop and the current induced in it. The developed scheme is compared with 2D and 3D finite‐element modelling for several positions of an airborne electromagnetic system flying over a closed loop. We also study the coupling effect between the current flowing in the closed loop and the current flowing in the horizontally layered conductive medium. The result shows that for the central position of the transmitter, the difference between axisymmetrical finite‐element modelling and our scheme is less than 1%. Moreover, for the non‐coaxial transmitter–receiver–loop system, the solution obtained by our scheme is in good agreement with full 3D finite‐element modelling, and our total simulation time is substantially lower: 1 minute versus 120 hours.  相似文献   

Morphodynamic evolution of a coastal lagoon entrance during swash overwash     

T.E. Baldock  F. Weir  M.G. Hughes 《Geomorphology》2008,95(3-4):398-411

New field observations of beach berm growth resulting in the sub-aerial closure of an intermittently closed and open lake or lagoon are presented. These perched estuarine systems frequently exhibit ephemeral entrances that respond to process forcing almost instantaneously on a geomorphic timescale, with closure by a supra-tidal berm of depositional origin. The observations were made following a mechanical opening of the entrance and show very rapid vertical growth of an initially low beach berm as a result of swash overtopping and sediment overwash. Very little simultaneous seaward progradation was observed. Sediment overwash volumes were obtained from survey data over a period of 12 days either side of spring tide and the observations also provide an accurate measure of swash sediment transport at the berm crest. A process-based parametric model is developed through robust parameterisations of wave run-up, wave run-up distributions and sediment transport and is applied to predict the total overwash transport into and infilling the estuary entrance. The model is tested against the field data and compares well with the observations. While the field data are site-specific, the proposed modelling framework represents a first step in modelling the complex growth and recovery of natural beach berms in broad-scale morphodynamic models.  相似文献   

竖向荷载下矩形闭合地下连续墙桥梁基础群墙效应研究     

文华  程谦恭  陈晓东  孟凡超 《岩土力学》2009,30(1):152-156

矩形闭合地下连续墙基础（简称闭合墙基础）是一种新型的桥梁基础。通过室内模型试验,对闭合墙基础的群墙效率、沉降比等进行了研究,同时探讨了闭合墙墙间距（即内侧边长）对群墙效应的影响。试验中采用了2组不同截面尺寸的模型墙,其中A组模型墙边长小于B组模型墙,墙厚和墙高均相同。试验研究表明,闭合墙与单片墙在相同沉降下的荷载比一般都大于1,B组闭合墙荷载比和群墙效率均大于A组闭合墙;闭合墙与单片墙在相同墙顶应力下的位移比和沉降比基本都大于1,A组闭合墙位移比大于B组闭合墙。在保持墙厚和墙高不变的情况下,适当增大闭合墙基础的内侧边长可以有效地提高群墙效率和承载性能,从而获得更好的经济效益。  相似文献   

Circuits of scrap: closed loop industrial ecosystems and the geography of US international recyclable material flows 1995–2005     

DONALD LYONS  MURRAY RICE  ROBERT WACHAL 《The Geographical journal》2009,175(4):286-300

The recycling of scrap material has been identified as an important strategy in the larger theory of industrial ecology. Industrial ecology argues that the traditional model of industrial activity needs to be transformed into a 'closed loop' industrial ecosystem where used materials (scrap) and by-products would substitute for virgin materials during production processes. The recycling of scrap material forms part of this larger effort to reduce the overall environmental impact of production and consumption. A key, but as yet, unresolved question in this process is the geographic scale (local, regional, national, global) at which loop closing should take place. This preliminary empirical research examines the export and import geography of the seven largest (by weight) US scrap commodities (iron and steel, paper, plastics, aluminium, copper, nickel and zinc) between 1995 and 2005 to ascertain the extent to which US scrap flows overseas and how that might affect our understanding of how material loops can close. Other than an integrated export and import relationship with Canada, the results suggest that there are two distinct circuits of scrap flows in the USA. The USA exports a substantial portion of the recyclable scrap generated each year to rapidly developing countries, while importing smaller quantities of scrap from the EU. With the major exception of exporting higher value iron and steel scrap to China, the US tends to export lower value scrap and import higher value scrap. In part this reflects imbalances in the supply and demand for scrap between the USA and the developing world, the lack of potentially available scrap and the absence of a robust recycling infrastructure in the developing world. Although such scrap circuits are probably not ideal, the use of US scrap in the developing world is both a realistic and preferable alternative in the short to medium term than virgin production.  相似文献