Research On Analog Circuit System Based On Seismoelectirc Logging

As a non-renewable energy source,oil has always been one of the important pillars to promote social development and national progress.However,with the development of society,the demand for petroleum resources is increasing,and the consumption of petroleum is also increasing.The exploration of oil fields has become an important topic.Seismic-electric logging while drilling is a combination of the seismo-electric effect and acoustic logging,and uses the characteristic of mechanical waves to excite electromagnetic waves in fluid-containing porous media to design seismo-electric logging tools.This method can effectively avoid the impact of the sonic logging method on the drill collar wave,and at the same time the measurement is more accurate,and it can measure a variety of parameters.This article first introduces the relevant background and development status of logging using the seismo-electric effect,and then designs the transmitting system and receiving system according to actual needs.The main function of the transmitting system is to generate a sound wave signal,and at the same time transmit a synchronization signal to the receiving system to notify the receiving system to start collecting.The acoustic signal excites an electromagnetic wave signal in a porous medium containing fluid.Since the parameters of acoustic signals and electromagnetic waves have a certain relationship,the launch system designed in this paper can realize the adjustment of the waveform,frequency and amplitude of the launch wave.The appropriate launch wave parameters can be selected through the discussion of the overall plan of the launch system.Since the transmission system uses a transducer to convert electrical signals to acoustic signals,this article also implements impedance matching to increase the transmission power.The receiving system is to receive the electromagnetic wave signal in the stratum,using eight antennas and the corresponding signal acquisition board at equal intervals.When receiving the seismo-electric signal,the signal acquisition board transmits the data to the communication board,from the communication board to the host computer Perform data analysis and calculate the propagation speed of the acoustic signal according to the time interval of the signal arrival,thereby inferring the formation information.Because the received seismoelectric signal is very weak and the environment is complicated,the design of the receiving system is based on the relevant theories of weak signal detection.It is designed from two aspects: noise suppression and signal amplification,including chip selection,circuit optimization and data transmission.In other aspects,we strive to have a better effect on the processed received signal when uploaded to the host computer,and reduce the burden for subsequent data analysis and verification.Finally,set up the system test environment and experimental platform to test the related functions of each circuit module.Finally,the excitation and reception of seismoelectric signals are realized through the joint debugging of hardware and software,and the acoustic signal speed extraction work is completed through related algorithms to realize the expected functions.