Underground fluid monitoring method based on natural potential equivalent fusion imaging
A technology of spontaneous potential and underground fluids, which is used in electric/magnetic exploration, geophysical measurement, radio wave measurement system, etc., to achieve high accuracy, improved positioning accuracy, and clear results.
Active Publication Date: 2019-04-16
PEKING UNIV
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[0006] In summary, the existing wavelet analysis method, charge source or dipole source occurrence probability imaging method and traditional inversion method all have limitations, and it is necessary to study a localization method with strong applicability and high accuracy
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[0038] In the following, a subsurface fluid monitoring method based on spontaneous potential equivalent fusion imaging proposed by the present invention will be further described in conjunction with model calculation examples. Such as figure 2 As shown, suppose there is a slope that rains for four consecutive days, from the third day to the sixth day, the average daily rainfall is 60 (mm / h), and there is a fault in the shallow layer, the location is shown in black thick line . The idea of the present invention is described as follows: obtain the main spontaneous potential data by laying out a suitable observation system; use the natural potential signal collected by the observation system at a certain moment to calculate the continuous complex wavelet transform and the probability of occurrence of the charge source / dipole, and compare the two The imaging results of the two methods are fused. The goal is to locate fracture flow and gain an overview of groundwater flow. Th...
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The invention discloses an underground fluid monitoring method based on natural potential equivalent fusion imaging. The method comprises the following steps that an observation system is arranged tocollect a natural potential signal; continuous complex wavelet analysis is conducted on data of a natural potential measuring line at a certain moment to obtain a wavelet transform coefficient; the possible position of an underground fluid source is obtained through the wavelet transform coefficient, and gaussian distribution imaging is conducted through fitting on variance and extreme line energy; in addition, source generation probability imaging analysis is conducted on the data of the natural potential measuring line at a certain moment, the occurrence probability of dipole is representedin the form of a vector arrow, so that the flowing state of an underground fluid is further understood; the position of an equivalent probability mass center in a certain probability interval is obtained through calculation, and is used as the position wherein a natural potential source occurs most probably; and weighted superposition is conducted on wavelet probability imaging and charge source occurrence probability imaging, and the result is used as a fusion probability imaging result, so that an underground fluid gathering area can be displayed more accurately.
Description
technical field [0001] The invention relates to the monitoring technology of underground fluid flow, in particular to an underground fluid monitoring method based on spontaneous potential equivalent fusion imaging. Background technique [0002] As an efficient and low-cost geophysical method, the spontaneous potential method is one of the important technical means for studying subsurface fluid flow. Based on the electrokinetic effect, the natural potential signal is sensitive to the flow of underground fluids, so this method has been applied to the monitoring of volcanic activity, dam leakage, and underground pollutant migration. [0003] At present, the methods used to analyze and interpret spontaneous potential signals mainly include wavelet analysis, charge source or dipole source occurrence probability imaging method, and traditional inversion method. Most inversion methods for spontaneous potential data rely on known resistivity structure information. However, in prac...
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IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 黄清华胡开颜
Owner PEKING UNIV