HIGH RESOLUTION MAGNETOTELLURIC METHOD FOR REMOVING STATIC FREQUENCY DOMAIN

摘要

A high resolution magnetotelluric method for removing a static frequencydomain,comprising steps of: (1) installing multiple sampling devices at the surfaceof the area tobe explored in a form of an array, adjacent observation points sharing a sameelectrode;(2) performing conventional processing on all observation results wherebyobtainingconventional observation curves of the observation points; (3) for the timeseries data ofthe original observation value of the electric field along the same directionof allobservation points, adding electric-filed components of two adjacentobservation points,those of three adjacent observation points, ..., and those of all pointswhereby obtainingelectric fields of different polar distance, i.e. a sequence of electric fieldcomponents oftopology points and encrypted topology points; (4) using the sequence of theelectricfield components of the topology points sequence and the encrypted topologypointssequence obtained above as an observation field value to perform powerspectrumanalysis and impedance tensor estimate, whereby obtaining a series oftopologicalobservation curves of a same record point; (5) drawing a resistance -variation of polardistance curve of a single frequency point of the record point; observing andanalyzing avariation rule of resistivity, editing and deleting static interferenceresistance, wherebyobtaining a resistivity value of the point at the frequency; and (6) repeatingthe previousstep to complete edition of all frequency points of all record points, wherebyobtainingobservation results without the static frequency domain.