下五河岩群物性参数特征

摘要

Physical property difference is precondition of geophysical prospecting, and physical property parameters are major basis for selection of a geophysical prospecting method and comprehensive interpretation. A Collection of Physical Property Parameters of Major Ore Concentration Areas in Anhui Province systematically collected previous work results on physical property, made an evaluation in terms of testing method, testing precision, rock and ore representativeness, accuracy of geological naming and reasonability of spatial distribution, put qualified physical property parameters in weighted statistics, made additional measurement and integration of density, magnetic susceptibility, natural residual magnetization intensity, resistivity and polarizability. With “geological unit” as the main line, this paper made statistics of physical property parameters of the Wuhe (rock) Group respectively from the Wuhe, Fengyang, Lilou and Huaiyuan areas, made comparison of properties of same rocks in different areas, analyzed differences in physical properties of the group in different geological settings, discussed the relationship between the change in material composition and the change in physical property, summarized the changing law of physical property of the group, described the relation between physical property features and regional geophysical anomaly, and made weighted statistics of “geological unit”, providing basic information for geoscientific research, comprehensive understanding of previous data, and geophysical prospecting.%物性差异是地球物理勘探前提，物性参数特征是物探方法选择及综合解释的重要依据。《安徽省重要矿集区物性参数集成》系统收集以往物性成果，从测试方法、测试精度、统计方法、岩（矿）石代表性、地质定名的准确性、空间分布合理性等方面进行评价，评价合格的物性参数参与加权统计，对下五河岩群密度、磁化率、天然剩余磁化强度、电阻率、极化率进行补测和集成。以“地质单元”为主线，按五河地区、凤阳地区、李楼地区、怀远地区分别统计五河岩群物性参数，且对不同地区相同岩性进行对比，分析不同地质背景的下五河岩群物性差异，探讨物质成分变化与物性参数变化关系，总结下五河岩群物性变化规律，描述物性特征与区域物探异常关系，并对“地质单元”进行加权统计，为该区地质科研、以往资料综合认识、地球物理勘探提供基础资料。