Long line source pseudorandomcode is launched and array reception transient electromagnetic system and method

The invention discloses a kind of long line source pseudorandomcode to launch and array reception transient electromagnetic system and method, this system includes two earth electrode A and B that emitter is connected and a plurality of survey line being distributed in whole work area with emitter.Described method includes: use pseudorandom encoded signal as exciting field waveform；Whole work area is selected the clock frequency of an optimal pseudorandom encoded signal along survey line continuous zoning, each subregion；In all observation stations, array simultaneous observation the earth electric field in the same direction, obtains coherence's data of all observation stations；Exciting field waveform based on coherence's data and synchronous recording obtains the earth impulse response；The resistivity charting in whole work area is obtained based on the earth impulse response.The present invention carries out non-homogeneous subregion to work area, and different subregions use different pseudorandomcode clock frequencies so that all observation stations have good signal to noise ratio and resolution ratio.The present invention can quickly, efficiently and accurately carry out extensive deep prospecting and Exploration of Oil And Gas.