Earthquake underground fluid inspection well and system and method used earthquake underground fluid inspection well to detect seismic precursor abnormal information

Abstract

The invention discloses an earthquake underground fluid inspection well and a system and a method used the earthquake underground fluid inspection well to detect seismic precursor abnormal information of gap pressure diffusion coefficients, which relate to earth physics and quakeproof disaster reduction technology. The earthquake underground fluid inspection well is arranged vertical to the direction of strata, a corrosion resisting seal stainless steel sleeve is installed in the center of the inspection well in the middle, cement is used at the bottom and the top of the inspection well for fixing a sleeve, a stainless steel clamp is adopted to fix the sleeve at the position of the axial center of the stainless steel sleeve additionally, multimode fibers are buried in a gap between the sleeve and the well wall, ore particles are filled in the gap between the sleeve and the well wall, so that an even gap medium layer is formed. A special high-resolution-ratio fiber sensor collects gas pressure dynamic response signals stimulated by earthquake cutting waves, a data analyzing system is integrated through a maximum likelihood deconvolution space-time conservation method and a weight integral method chips, characteristic scale of the dynamic gap pressure diffusion coefficients related to the cutting waves is obtained through calculation, an earthquake source generated the earthquake cutting waves is carried out high-precision earthquake location, scientific decision-making data with earthquake source physical significances are provided to seismic prediction. The obtaining method of the characteristic scale of the dynamic gap pressure diffusion coefficients can be used for well wall fracture monitor of oil exploitation wells and carbon dioxide geology seal injection wells.

Description

technical field [0001] The invention relates to the technical field of geophysics and earthquake prevention and disaster reduction, and is a method for measuring the abnormal dynamic information of the earthquake precursor pore pressure diffusion coefficient. A high-resolution optical fiber sensor is used to collect dynamic pore pressure data excited by seismic shear waves. According to the pore pressure The propagation theory and the maximum likelihood deconvolution space-time conservation method obtain the characteristic scale of the dynamic pore pressure diffusion coefficient associated with the shear wave, and provide scientific decision-making parameters with the physical meaning of the source for earthquake prediction. The main equipment is the structure of the seismic observation well And optical fiber sensor, pore pressure data analysis system based on Brillouin scattering time-domain analysis mode measurement principle, dynamic pore pressure diffusion coefficient maxim...

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Problems solved by technology

[0007] Therefore, to develop a method for anomalous dynamic information of earthquake precursor pore pressure diffusion coefficient with high signal-to-noise ratio, high spatial dynamic resolution, and robust signal, and to obtain earthquake prediction parameters with physical significance of the source, is an increasingly urgent and urgent task. solved problem

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