1887

Abstract

Summary

Groundwater flow is mainly dominated by fractures or secondary porosity especially in rock formation considering that rocks generally have very low porosity and permeability. The key issue is thereby to identify fractures and characterize their role in groundwater flow. A dedicated test-bed was established and managed to improve field testing techniques and analysis methods for characterizing flow and transport properties of formations. This article paid attention to the hydrogeophysical characterization of test-bed site, and furthermore focused on the identification of individual fracture attributes and high permeability conduits through the thinly layered and fractured zone using comprehensive integrated interpretation based on borehole and core data. Gamma ray logs gave us an information to lithologic characteristics of test-bed, and spectral gamma ray signature assisted in the evaluation of lithology variations and interval stratigraphy. Temperature and borehole image analysis yielded significant identification of all fractures in which active groundwater flow occurs. Understanding fractured formation properties such as lithology, fracture distribution, aperture, and fracture development led to conceptual model reflecting hydraulically active fractures. Ongoing research focuses on the hydraulic and geometrical characterization of fracture networks as well as individual fractures.

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/content/papers/10.3997/2214-4609.201902638
2019-09-18
2024-03-28
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