2-D Resistivity Imaging for the Crooked Survey Line on the Tough 3-D Topography

In the 2-D resistivity survey, survey line is sometimes detoured because of geographic or man-made structures. Although the effect of the crooked line is believed to be negligible in most of cases, it should be considered to obtain accurate image of the subsurface. In this study, we examine the effect of crooked survey line on the 2-D resistivity data. A strategy of 2-D resistivity inversion based on the 3-D inversion code with 2-D model structure was suggested to incorporate the crooked line into the inversion, which provided accurate image of the subsurface compared to a conventional 2-D inversion result. As another important practical issue of 2-D resistivity survey, tough topographic variation in the strike direction is also implemented using this strategy to obtain enhanced imaging capability. Field data example of 2-D resistivity survey for mineral exploration at the mountainous area shows that our strategy is very useful in the combined case of crooked survey line on the tough topographic area.