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首页> 外文期刊>Arabian journal of geosciences >Geophysical signatures resolving hydrogeological complexities over hard rock terrain--a study from Southern India
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Geophysical signatures resolving hydrogeological complexities over hard rock terrain--a study from Southern India

机译：解决硬岩石地形上水文地质复杂性的地球物理特征-来自印度南部的一项研究

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摘要

A series of geophysical parameters have been applied with geological perception to resolve the hydrogeological complexities over granitic terrain at Hyderabad, India. Frequent failure of borehole drillings and the thrust conditions of community have prompted a noninvasive suitable tool, applied at small scale for pinpointing potential well site. Geophysical scanning, viz. electrical resistivity tomography (ERT), spontaneous potential (SP), and electrical gradient profiling (GP) were employed within the restricted space of housing complex to obtain the true characteristics of the subsurface lithology, where anomalies by the underground utility structures have been nullified. Results showed, in ERT, the low order of resistivity range 123 to 200 Ωm showing a plume like weathered zone underlain by sudden slip of massive granite (>217Ωm) was of great interest to proceed further in the process. Here, the switchover in SP value from +18 mV to -17 mV and GP from mean value 10 to 90 mV/m was recorded. The anomalies in SP and GP were precisely coincided with the ERT where upcoming of subsurface massive granite next to the inferred fracture was noted. Drilling core logs satisfies the geophysical signatures ensuring the inferred saturated fracture with the total yield 1,302 gal/h.
机译：一系列具有地质感知的地球物理参数已被应用，以解决印度海得拉巴花岗岩地带的水文地质复杂性。井眼钻探的频繁失败和社区的推力条件促使人们采用了一种适合小规模使用的非侵入式合适工具，以查明潜在的井场。地球物理扫描，即。在住宅区的受限空间内采用了电阻层析成像（ERT），自发电位（SP）和电梯度分析（GP）来获得地下岩性的真实特征，其中地下公用设施结构的异常已被消除。结果表明，在ERT中，低电阻率范围为123至200Ωm，显示出块状花岗岩（>217Ωm）突然滑下而形成的像羽状风化带一样的羽状流，在此过程中值得进一步关注。此处，记录了SP值从+18 mV切换到-17 mV，GP从平均值10切换到90 mV / m。 SP和GP的异常与ERT恰好相符，在ERT处发现了地下​​大块花岗岩即将到来的裂缝。钻孔岩心测井曲线符合地球物理特征，可确保推断出的饱和裂缝，总产量为1,302 gal / h。

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