An Approach to Evaluate Groundwater Salinity Using Electrical Well Logging Data Case Study: Sandstone Aquifer in Daging Oil Field, China
Zhaohui Huang, E. A. Elzein Mohammed, Zou Changchun, Chen Zhenya

Abstract
The salinity of water is an important parameter in groundwater evaluation research. In this paper, the total dissolved solid (TDS) was strongly correlated with apparent resistivity and spontaneous potential logs data in a sandstone formation aquifer. A large number of preexisting electrical logs data conducted for the purpose of hydrogeological studies have been gathered and used to predict the groundwater TDS. Based on the electrical characteristics analysis of a sandstone aquifer, taking the influential factors of the Archie’s Equation and the creation mechanism of spontaneous potential (SP), the theoretical exponential function between the TDS and the formation spontaneous potential as well as the formation resistivity (Rt) were deduced and modeled in this paper. A reasonable value approach was introduced to read the electrical logs data and the static spontaneous potential logs data, and then, the numerical fitting method was employed to analyze the relation between groundwater salinity and the electrical logs data of the Quaternary sandstone aquifer of the Songliao plain, Northeastern China in Daging Oil field,. Finally the groundwater quality assessment was successfully carried out by this methodology in some production wells. The correlation procedure adopted in this study could be applied to evaluate groundwater salinity of new target areas in the china or elsewhere.

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