Study on high density resistivity method of underground reservoir

In the development of underground space,underground buildings and municipal facilities should be avoided.However,because of various reasons specific location of underground buildings and municipal facilities are not clear.These form the obstacle in the development of underground space,cause adverse effect on the design and construction.High density resistivity method has the advantages of low cost,high efficiency,rich information,easy to explain.These underground obstacle problems can be solved well by high density resistivity method.In order to determine the location of underground reservoir in the selected line of metro,high density resistivity method was selected for detecting the underground reservoir.Based on the inquisitional data,the forward model was established.The following conclusions can be drawn from the forward results,a) The detection results at the top limit have high credibility if the high resistivity of the targets shallow buried is detected by high density resistivity method.On the other hand,when the targets are low resistivity,the detection results at the top limit must be deeper than the actual value,b) When the low resistance targets are detected by high density resistivity method,the detection results of its width is high reliability.But when the targets are high resistance,the reliability of the detection results turns to diametrically opposed conclusions.The results are wider than actual value,c) It can detect the interface of the object if the surface has no water.It can't detect the interface of the object if the surface has water.The detection result is in close agreement with the modeling result.This shows that is feasible in the exploration of underground reservoir by using the high density resistivity method in underground space development.Reliable references for design and construction are provided to the detection results of the high density resistivity method.Forward modeling is conducted according to the known conditions,which contributes to the results interpretation of high density resistivity method.