摘要
流体的物质来源 ,流体活化→迁移→聚集→沉淀过程的化学机理 ,流体输运与定位过程的物理机制 ,可视为构造—流体—成矿系统这一课题研究中的主要问题。相对于前两个基本方面的研究进展而言 ,流体的输运与定位过程的物理机制仍然是矿床学研究中一个重要难题。流体输运物理规律的研究方法主要包括定性分析、定量模拟和相似物理实验等。定性分析主要是对大量地质现象的高度概括和科学升华 ,分析结果表明成矿流体 ,尤其是多相热流体在给定三维动态形变场中的运移趋势及定位规律是成矿流体输运物理机制研究的关键问题 ;但由于逻辑推理和经验判断在定性研究中扮演了重要角色 ,定性研究的结果显得抽象和过于概略 ,不能详尽地阐明流体输运的物理过程。而定量模拟难以把握成矿期介质渗透率及成矿应力场的动态变化 ,使其与实际地质对象在物理性质上具有一定差距。物理实验虽能处理二维动态构造形变场中流体输运问题 ,但由于实验条件的限制 ,难以处理三维空间内流体运移问题。因而 ,上述 3种研究手段优势互补 ,它们的交错应用及结论间的相互对比与验证 ,将有望解决流体输运与定位过程物理机制研究中的重要问题。
The major focusesin the domain of structure-fluid-metallogenism system include the origin of metallogenic marerials, the chemical mechanism of activation, transportationand precipitation of metallogenic elementsand the physicprocess of geofluid’s transportation and locating. Comparing with the other two focuses, the process physicof the geofluid's movement bears more difficulty and questions for the researchers. The current methods for the study of physicprocess of the geofluid's movementmainly consist of qualitative analysis, numerical simulation and analogue experiment. Based on the generalizationand reasoning of basic geological phenomena, qualitative analysisindicate that the key problem of geofluid's transportation process is the physic mechanismof transportation process of polyphase fluid in the 3D dynamical structuralframe. Yet this key problem goes beyond the extent of the research abilityof the qualitative analysismethod. Because the numerical simulation method neglects the dynamical change of penetrabilityand stress field during metallogenic process, it is devoid of the similitudeto the reality and failed to deal with the problem too. Althoughthe analogue experiment can simulate the transportation process of polyphase fluid in the 2D dynamical structuralframe, it can't carry out the 3D experiment because of the limitation of the experimental conditions. But in virtue of the mutual complementaryadvantages of the three methods, the colligated application of those methods can discover the physicmechanism of transportation process of polyphase fluid in the 3D dynamical structuralframe.
出处
《地球科学进展》
CAS
CSCD
2004年第3期393-398,共6页
Advances in Earth Science
基金
国家自然科学基金项目"构造体制转换与流体多层循环动力学"(编号:40172036)
教育部科学技术研究重点项目(编号:01037)
国家重点基础研究发展规划项目"大规模成矿作用及大型矿集区预测"(编号:1999043206)
国家自然科学基金重点项目"大陆演化过程过程中成矿系统的形成与保存——典型矿集区剖析”(编号:40234051)资助
关键词
流体输运
数值模拟
物理实验
Geofluid transportation
Numerical simulation
Analogue experiment
