Types and genesis of induced polarization anomalies in the water-rich structures of the Taian karst area

Abstract

From December 2010 to April 2011, agricultural production in North China and Huang-Huai basin experienced difficulties because of severe drought. Based on samples from the development of deep karst groundwater resources, a set of laws has been established to reflect the types and genesis of induced polarization (IP) anomalies in a range of water-rich karst structures in Taian area. The curves of IP anomalies in the water-rich structures can be classified into ramps, slow downs, low-resistance platforms and low-resistance V patterns. IP anomalies observed in apparent resistivities contours can be classified as low-resistance steps, low-resistance gradients and low-resistance U patterns. In water-rich areas hosted mainly in caves, IP anomalies include low-apparent resistivity, low-visible polarization, low half decay time, low attenuation and low multi-parameter synchroneity. These water-rich areas mainly consist of fault structures, where the IP anomalies have a low-apparent resistivity and low-vision polarization, and exhibit relatively long half decay time, maximum attenuation value exceptions, apparent resistivities and multi-parameter “reverse phase” anomalies.