Comparison of Simulated Results of Deployed and Towed Undersea Dipole Sources in Marine CSEM Method

Abstract

We developed a 2-dimension nonlinear conjugate gradient (NLCG) inversion program to compared the responses generated by deploy and towed horizontal source dipoles in marine CSEM method. We constructed different geoelectic models for different detecting objective and drew the conclusions. For the resistivity buried shallower than 500 m and transverse resistance lower than 4×103Wm2 , the advantage of deployed mode is more obvious. The lateral resolution is much higher and the false anomalies are much less than the towed one. When the rotate or tilt angle of source dipole over 10 degrees or the deviation more than 100 meters, the error should be marked which can be corrected once by the deployed mode. Hence, considering the more time consumption and more complicated procedure, the deployed mode should be used as a delicate survey method in the range already scanned by the towed mode.