安龙戈塘金矿二龙口矿段(氧化矿)物质组成和金的赋存状态初步研究

戈塘金矿是一种微细粒金矿,本文着重对含矿岩石、金矿物、伴生矿物及矿石的结构、构造特征及金的赋序状态进行了研究,可见金、不可见金主要为自然金,呈显微粒状、次显微粒状,它们的绝大多数呈游离金,包裹金甚少,通过研究证明主要在褐铁矿中富集.     

影响震后城市重建选址的社会因素的研究

综述了震后城市重建选址的研究，对３种选址方式及其影响因素进行了讨论了，指出了人文因素对选址方有很强的影响。结论指出：在震前做好重建早是提高减灾效率的关键。     

内蒙古固阳县席麻塔一带共轭切带的地质特征及？…

通过区调填图在内蒙古固阳县北山新太古代石英闪长岩和中元古代英云闪长岩中发现了韧性剪切带。通过野外调查、应变测量及显微构造电子控针等方法研究表明,韧性剪切带为两组呈共轭组合型式产出,形成机制与西位利亚 块和华北板块相互挤压作用有关,为在地球较溶层次、在压扁环境下的简单剪切,形成时代为中元古代末期,变质相为绿片岩相。     

IMU/DGPS在海洋独立岛屿测量中的应用分析

在传统海洋航空摄影测量中,由于外业控制点和航线连接点的选取困难,使大比例尺独立岛屿的测量精度无法保证.将IMU/DGPS在海洋航空摄影测量中加以运用,通过无控或稀少控制的辅助空中三角测量解算方法,探讨在大比例尺独立岛屿测量中的控制点布设要求,为海岛(礁)的外业控制点布设提供参考.     

Delineation of three-dimensional well capture zones for complex multi-aquifer systems

The delineation of well capture zones is a basic component of ground water protection. The conventional methodology for capture zone delineation is backward advective particle tracking, often applied under the assumption of a two-dimensional aquifer. The suitability of the conventional approach for complex heterogeneous multi-aquifer systems was investigated, using the Waterloo Moraine aquifer system as an example. It was found that the conventional approach produces irregular particle tracks that require judgment to interpret in a meaningful way, and it can raise questions that may affect the credibility of the capture zone delineation. As an alternative, the potentially powerful but little-used backward-in-time advective-dispersive transport approach was investigated. A key advantage of this approach is its capability to represent local heterogeneities through the dispersion term. The dispersion process has a natural smoothing effect that results in unambiguous capture zones without the need for interpretation, thus enhancing credibility. The question of capture zone validation is also addressed. The meaning of a three-dimensional capture zone is considered, and it is shown that a fully three-dimensional representation of the system is crucial for valid results. The distinction between the maximum extent capture zone and the surface capture zone is also explained. In the case of complex heterogeneous systems, advective particle tracking can be used as an initial screening tool, whereas the more realistic backward-transport modeling approach can be used for final capture-zone delineation.     

Economics of transboundary aquifer management

This paper presents a general model of optimal water management for a transboundary aquifer under three different management approaches: cooperative, noncooperative, and myopic. Comparing the results from the approaches, we find the cooperative solution, where a single management plan is executed for all parts of the aquifer, results in the highest level of net social welfare, followed by the noncooperative and then the myopic. The trade-offs we find for the higher levels of welfare are lower use levels in the earlier periods. We present a short discussion of factors that can increase the inefficiencies of the models and suggest directions for future research.     

金湖凹陷铜城断裂带低渗透储层特征研究

研究了金湖凹陷铜城断裂带阜宁组低渗透储层，该区阜宁组具有沉积物偏细、孔喉半径小、储层物性差的特点。对影响砂岩储层物性的主要因素进行了分析，认为成岩作用、泥岩欠压实、沉积环境、流体活动、裂缝是主要的控制因素，并对储层改造效果进行了分析。     

震前地下水中硫化氢气体的短临前兆特征

本文以实际震例为依据,叙述了天山地震带中强地震前地下水中硫化氢气体的短临异常特征。以硫化氢气体为例,对地下气体的地震前兆机理进行了粗浅的讨论。指出中强地震前,硫化氢气体普遍出现短期异常变化,临震突变现象也比较清楚。硫化氢气体在短临异常阶段的特征具有动力过程(应力应变能的预释放)的突发性、气量增长的突变性和异常时间的短促性。文中还对前兆近场和前兆远场在不同孕震阶段中的受力状态和异常特征进行了分析。认为主破裂前的加速蠕滑和微破裂以及由此而产生的超声振动和低频形变波的传播是临震前地下水中硫化氢气、氡气和其他气体浓度普遍增高的主要原因。