Acquisition test for CEMP in Zhagegaonao Basin of Beishan area
XU Haihong1, LU Jincai1, LIU Jianli2, HAN Xiaofeng1, CHEN Xiaolong2, ZHANG Quan2
1. Xi’an Center of China Geological Survey, Xi’an 710054, China; 2. Geophysical and Geochemical Exploration Team, Shaanxi Bureau of Geology and Mineral Exploration and Development, Xi’an 710043, China
Abstract：In order to determine the field acquisition parameters of electrical collection in Beishan area, and carry out CEMP exploration effectively and reasonably, the authors took Zhagegaonao Basin as an example and set up series of experimental research work on collecting parameters according to different factors affecting field data collection. The data acquisition results for each parameter were analyzed through comparison of the apparent resistivity curves, and the appropriate electrode spacing and acquisition time were also determined. According to the comprehensive research, the electrode spacing in the study area should be 100 m, and it can be shortened appropriately in some harsh areas, with the minimal value of 70 m. The effective acquisition time in the field is 12 hours, and it should not be less than 8 hours in some special cases. The acquisition time should be extended appropriately in interference areas. The authors also summarized and analyzed the quality control countermeasures and improvement measures in different situations that affect the quality of field data collection, such as grounding resistance and wind interference. The field section interpretation shows that CEMP can reveal the main strata distribution and reflect the structural characteristics of the study area. The results of this paper can provide a basis for CEMP exploration and deployment of Mesozoic basins in Beishan area.
2019, Vol. 6 
