Abstract
Traditionally, induced polarization (IP) methods have been used to explore metallic ore deposits. Applications for hydrogeological and environmental purposes have been increasing (e.g. saline mapping, presences of clay, and contaminant movement). The measured response of IP of the subsurface is a function of lithology and fluid properties which are controlled by mechanisms operating at the grain-fluid interface. In non-metal bearing rocks, membrane polarization is the main mechanism dictating the IP measurement. In time domain IP, parameters of interest include chargeability and relaxation time distribution (RTD). Quantifying subsurface properties from IP parameters remains difficult. This study focuses on correlating time domain IP parameters such as chargeability, Ma, and RTD to structural information in fractured bedrock. Borehole IP surveys were collected in different type rock type under varying time domains along with other geophysical logs. Primary data show differences between the positive and negative cycles. This asymmetry is assumed to be related to borehole effects. By understanding fracture structure and lithologic controls on IP parameters, broader hydrogeological applications can help image the subsurface.
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