Frequency domain natural electric field annular three-dimensional exploration method for identifying underground fluid flow direction

Abstract

The invention provides a frequency domain natural electric field annular three-dimensional exploration method for identifying the underground fluid flow direction. According to the method, one devicefor measuring a natural electric field is adopted to collect natural electric field frequency domain signals of a known geological point, another device for measuring the natural electric field is adopted at other measuring points to collect natural electric field frequency domain signals of multiple frequencies in multiple directions on the measuring points in an annular mode, the natural electric field frequency domain signals of the other measuring points and the known geological point with the same time and frequency are selected to be subjected to ratio conversion to obtain an annular three-dimensional exploration result, and thus the purposes of eliminating random changes and interferences of the natural electric field signals, improving the exploration effect and identifying the underground fluid flow direction are achieved.

Description

technical field [0001] The invention relates to an annular three-dimensional exploration method of natural electric field in frequency domain for identifying the flow direction of underground fluid in the field of exploration geophysics. Background technique [0002] In electrical exploration, there is a frequency selection method that uses the measurement of natural electric fields for geological exploration. This method uses two grounded measuring electrodes to directly measure the electric field signal strength of different frequencies of the natural electric field of the earth, without measuring the natural magnetic field of the earth, and without arranging an artificial electric field, so the method has high working efficiency, low exploration cost, and resistance to Humanistic electromagnetic interference ability is strong, and it has obvious advantages in geological exploration. However, because the excitation source of the natural electric field signal that forms th...

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Problems solved by technology

[0005] The purpose of the present invention is to propose a frequency-domain natural electric field annular three-dimensional method for identifying the flow direction of underground fluid based on the problems of low accuracy in judging the flow direction of underground fluid, low comparability of natural electric field signals, and poor exploration effect in the existing frequency selection method. Exploration method, improve the judgment accuracy of underground fluid flow direction, reduce the influence of the excitation source signal of natural electric field and the change of human electric field at different times, so as to finally improve the exploration accuracy and effect of natural electric field

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