Abstract: Electrical characteristics of rock are the basis to carry out electrical prospecting and data processing interpretation. Physical parameters leading to electric anomaly are mainly related to the size of rock resistivity distribution. While analyzing the CEMP data in southern margin of Ordos Basin, it is found that there is great difficulty in tracking the Triassic and Permian by using the same electric combination properties. To solve the problem, statistical analysis is made on the electric logging data of multiple wells in the surveyed area and its surrounding areas, moreover the electric combination and distribution characteristics of different areas of the Triassic and Permian are analyzed and studied. Results show that the same set of strata in eastern and western areas shows different electric properties, i.e. in the eastern area the resistivity of the Triassic is higher than that of the Permian, while in the west the resistivity of the Triassic is lower than that of the Permian. The CEMP profile reinterpreted according to the above law is more objective and reasonable, and the interpretation result conforms to the prediction of geologists. Seismic exploration is deployed on the basis of the CEMP results.

Key words: CEMP exploration, resistivity, electric logging, statistical analysis, geoelectrical structure