APPLICATION AND EXPLORATION OF GEOPHYSICAL METHODS IN GEOLOGICAL MAPPING IN STRONGLY WEATHERED AREA
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摘要: 华南强风化区覆盖较厚，露头少，植被发育，通行困难，利用传统的地质填图方法很难有效查明风化覆盖层及其下伏地层、岩石、构造、矿产等地质特征。笔者利用浅层地震、高密度电法、EH4电磁成像等综合物探方法，对风化层厚度、基岩的岩性和产状、隐伏断裂等进行探测试验。通过对3种方法所得数据的分析和野外验证结果，了解了3种物探方法的有效性和适用性，初步总结了在强风化区填图运用多种物探手段填图的方法。Abstract: Due to the unique geological feature of Southern China area, such as thick overburden layerfew outcrops, thick-growing vegetation and difficult access, it is difficult to effectively identify the geological characteristics of weathered layers and its underlying strata, rocks, structures and minerals by means of traditional geological mapping methods. Through comprehensive geophysical methods including shallow earthquake, high density resistivity and EH4 electromagnetic imaging, the geological characteristics like weathering layer thickness, bedrock lithology and occurrence, and buried fault are tested. By analyzing the data obtained from this 3 methods and the results of field investigation, the validity and applicability of this 3 geophysical methods are studied, and a series of geophysical methods for geological mapping in strongly weathered area are preliminarily summarized.
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图 3 1线地震反射波法叠加剖面图
Figure 3. The stacked profile of seismic reflection wave method in line 1
图 6 2线地震反射波法叠加剖面图
Figure 6. The stacked profile of seismic reflection wave method in line 2
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