High-density Resistivity Forword Model In Contrast With The Experiment

High-density resistivity method is an exploration method which is developed on the basis of the conventional electrical prospecting. It falls into the category of direct-current resistivity methods. High-density resistivity method can provide abundant geoelectrical information that is an advantage to explain and deal with the complex field data taking more intensive measure points and a variety of combinations of simultaneous measurement devices. The Resistivity Tomoghaphy (RT) technique is a technique which takes collected apparent resistivity data for study of forward imaging and invertion imaging.Our predecessors have done a lot of work for the research and application of RT. This paper summarizes the predecessors about the concept of the RT, the history and the results of RT study. On this basis, we can take the RT as a mean to study the forward model numerical stimulation on the theoretical model to get the apparent resistivity data of the model. Then through physical modeling by high-density resistivity micro-system on theoretical model in the laboratory, we can get the apparent resistivity. Through comparing and analysing imaging chromatograms of the numerical simulation apparent resistivity and physical simulation gotten by RT, we get the following conclusions:1. Winner device, dipole device, differential device used to measure actually make the relative forward model move downward 20% of the total number of layers in reflecting flat lying body of high resistance and low resistance and upright body of high resistant, so the maximum depth of exploration of the abnormal area in the figure can be reduced by 20% when interpreting and deal with the actual material. The relative forward model of upright body of low resistance move upward 30% of the total number of layers, so the maximum depth of exploration can be increased 30%.2. Winner device, dipole device, differential device used to measure actually make the abnormal area stretch in the vertical in reflecting flat lying body, so the thickness of the abnormal area can be reduced appropriately in the figure when interpreting and dealing with the actual material. However it makes the abnormal area stretch in the horizontal in reflecting upright body, the length of the abnormal area can be reduced appropriately when interpreting and dealing with the actual material.3. Through comparing the similarity of the imaging graphs of forward model and the actual measurement, winner device performs better in terms of the exploration of the flat flying body of high resistance, but worse at the exploration of upright body of low resistance; dipole device is better at the exploration of the upright body of high and low resistance and flat lying body of low resistance.The above conclusions make us have a deep understanding of the exploration capabilities of different high-density resistivity devices and abnormal patterns of apparent resistivity section. It gives big help for choices of field devices, data processing and material interpretation.