Method and device for evaluating geothermal water-rich geological anomalies

Abstract

The invention discloses a method and device used for evaluating geothermal water-rich geological anomaly, which belongs to the field of geophysical electromagnetic exploration. The method comprises the steps that a geophysical model is constructed according to the existing data of a target area in combination with a geological task, and forward modelling is carried out to determine the transmit-receive range of an excitation field source in the target area. By determining effective stripe zone observation in a survey key area, a passive source electromagnetic method measure point (MT / CEMP) and a number of parallel measure lines parallel to a measure line are arranged in the survey key area. Through multi-azimuth multiple excitation, the coverage number of times is effectively improved; the amount of electromagnetic response information is expanded; and the superimposed signal to noise ratio is improved. A passive source electromagnetic method and a controllable source electromagnetic method are combined to carry out multi-parameter joint constraint inversion. Multi-information and multi-parameter coupling is used to reduce the multiplicity of electromagnetic method inversion, The inversion accuracy is improved. The influence of a field source shadow effect is overcome. Reliable resistivity and polarization rate distribution law of geological anomaly in the target area is acquired.

Description

technical field [0001] The present invention relates to the field of geophysical electromagnetic prospecting, and more specifically, the present invention mainly relates to a method and device for evaluating geothermal and water-rich geological anomalies. Background technique [0002] Geophysical prospecting is an important means of deep geothermal geological prospecting, and electromagnetic prospecting is one of the main methods. With the continuous development of electromagnetic prospecting technology, the accuracy and reliability of prospecting results have been greatly improved. Among them, the use of electromagnetic methods in the exploration of geothermal resources to identify geological anomalies such as faults and fissures and their water-absorbing properties has achieved obvious geological effects. Arranged collection station combination method, this method mainly suppresses the original regular interference and random interference propagating along the survey line ...

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Problems solved by technology

[0003] One of the purposes of the present invention is to address the above-mentioned deficiencies and provide a method and device for evaluating geothermal water-rich geological anomalies, in order to solve the existing technology that cannot effectively meet the requirements of increasing the number of coverage and enhancing the ability to suppress random noise. The controllable source electromagnetic method has low 3D acquisition efficiency, immature post-processing technology, and lack of practical application value and other technical problems

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