CN-122017975-A - Seismic wave advanced detection method, device and system combined with geophysical prospecting

CN122017975ACN 122017975 ACN122017975 ACN 122017975ACN-122017975-A

Abstract

The invention provides a seismic wave advanced detection method and device combined with geophysical prospecting, which comprise the steps of obtaining while-drilling engineering parameters in an advanced drilling process by using a geophysical prospecting module, obtaining three-dimensional geological attribute bodies of a region to be detected based on inversion of the while-drilling engineering parameters, obtaining a plurality of groups of wave field signals received by a wave detector after exciting a seismic wave at a plurality of depth positions of the advanced drilling, converting the three-dimensional geological attribute bodies into an initial velocity model for seismic wave inversion, constructing constraint terms based on a discrete velocity value sequence along an advanced drilling track, carrying out iterative inversion to minimize the difference between the wave field signals generated based on the model and the wave field signals received by the wave detector, and determining geological interpretation results of the region to be detected based on the initial velocity model after iterative optimization. According to the invention, accurate iteration basis and constraint are provided for seismic wave detection by coupling geophysical prospecting data, a model with higher accuracy is obtained, and a geological interpretation result of a region to be detected with higher accuracy is obtained.

Inventors

Chu Zhaofei
SHI YUNFANG
WU ZHIJUN
YIN HAIBO
REN MENGXIONG
HE YILIN
LI BIAO
HE QINGJUN
CHEN TAO

Assignees

武汉大学
中国水利水电第十四工程局有限公司
重庆城投基础设施建设有限公司

Dates

Publication Date: 20260512
Application Date: 20260204

Claims (10)

1. A seismic wave advanced detection method combined with geophysical prospecting is characterized by comprising the following steps of: acquiring drilling-while-drilling engineering parameters in the advanced drilling process by using a geophysical prospecting module, and inverting based on the drilling-while-drilling engineering parameters to obtain a three-dimensional geological attribute of a region to be measured; acquiring a plurality of groups of wave field signals received by a wave detector after exciting the seismic waves at a plurality of depth positions of the advanced borehole; Converting the three-dimensional geological attribute into an initial velocity model for seismic wave inversion, and constructing a constraint term based on a discrete velocity value sequence along a lead drilling track to perform iterative inversion so as to minimize the difference between a wave field signal generated based on the model and a wave field signal received by a wave detector, wherein the discrete velocity value sequence is determined based on the while-drilling engineering parameters; and determining a geological interpretation result of the region to be detected based on the initial velocity model after iterative optimization.
2. The method for advanced detection of seismic waves by combining geophysical prospecting according to claim 1, wherein the step of obtaining the while-drilling engineering parameters of the geophysical prospecting module in the advanced drilling process and inverting based on the while-drilling engineering parameters to obtain the three-dimensional geological attribute of the region to be detected specifically comprises: Determining the mechanical specific energy of the rock mass at the corresponding drilling position based on the drilling-while-drilling engineering parameters of each advanced drilling construction process of the region to be measured, and mapping the mechanical specific energy into single-axis compressive strength; And carrying out spatial interpolation on the uniaxial compressive strength of the plurality of advanced drilling holes in the region to be detected, and generating a three-dimensional geological attribute body of the region to be detected.
3. The method of seismic wave advanced detection in combination with geophysical prospecting according to claim 1, wherein said step of converting said three-dimensional geological attribute into an initial velocity model for seismic wave inversion and constructing a constraint term based on a sequence of discrete velocity values along an advanced borehole trajectory comprises: converting the three-dimensional geological attribute into a three-dimensional velocity model, and taking the three-dimensional velocity model as the initial velocity model; Constructing an objective function based on the initial velocity model: ; Where m is the model vector field to be inverted, F (m) is the positive operator, d s is the received wavefield signal, and W s is the seismic data weight; Is a borehole constraint weight, H b is a borehole sampling operator, d b is a sequence of discrete velocity values, as borehole constraint data, W b is a borehole data weight, L is a differential operator, a is a weight coefficient of a priori/smooth operator, Is a cross gradient, z is a second attribute field, Is the weight coefficient of the cross gradient; and determining a geological interpretation result of the region to be measured based on the result of solving the objective function.
4. The seismic wave advanced detection device combining geophysical prospecting is characterized by comprising a bearing and propulsion system and an impact seismic source module; The bearing and propulsion system comprises a propulsion mechanism for conveying the impact seismic source module in the advanced drilling hole and a locking mechanism for fixing the impact seismic source module in an excitation position in the advanced drilling hole; the impact source module comprises an exciter, an impact rod and an incidence rod, wherein the exciter is used for driving the impact rod to impact the incidence rod, so that the incidence rod receives instant impact and is coupled with the rock wall of the advanced drilling hole to excite seismic waves in the advanced drilling hole.
5. The seismic wave advanced detection apparatus of combined geophysical prospecting according to claim 4, wherein the propulsion mechanism comprises a hollow sleeve formed by splicing a plurality of pipe sections and a propeller for driving the hollow sleeve to move along the axial direction thereof; The roller assembly is arranged on the outer side wall of the hollow sleeve and comprises a telescopic piece which stretches radially along the hollow sleeve and a supporting roller which is fixedly connected to the telescopic end of the telescopic piece.
6. The geophysical prospecting system of claim 5 wherein the locking mechanism comprises a plurality of arms which are radially movable along the hollow casing, the arms being spaced from the roller assemblies.
7. The geophysical prospecting combined seismic wave advanced detection apparatus according to claim 5, wherein the seismic source module comprises a mounting pipe section, an incident rod and an impact rod movably disposed in the mounting pipe section, and a reset structure for resetting the incident rod, the mounting pipe section being disposed in a hollow sleeve at a distal end and partially protruding from the hollow sleeve.
8. The geophysical prospecting combined seismic wave advanced detection apparatus according to claim 4, wherein the incident beam and the impact beam have the same beam diameter as the material, and the impact beam has a length smaller than the length of the incident beam.
9. The geophysical prospecting combined seismic wave advanced detection apparatus according to claim 4, wherein the length of the impact beam is not less than 0.5m and not more than 3m, and the length of the incident beam is not less than 1m and not more than 4 m.
10. A combined geophysical prospecting seismic wave advanced detection system for implementing a combined geophysical prospecting seismic wave advanced detection method according to any one of claims 1 to 3, comprising: The geophysical prospecting module is used for forming an advanced drilling hole by advanced drilling, recording drilling-while-drilling engineering parameters used in the advanced drilling process, and inverting based on the drilling-while-drilling engineering parameters to obtain a three-dimensional geological attribute of the region to be measured; the detection module is used for exciting seismic waves at a plurality of depth positions of the advanced drilling hole; A detector for receiving sets of wavefield signals after excitation of the seismic wave at depth locations of the advanced borehole; the data processing module is used for converting the three-dimensional geological attribute into an initial velocity model for seismic wave inversion, constructing constraint terms based on a discrete velocity value sequence along a lead drilling track, and performing iterative inversion so as to minimize the difference between a wave field signal generated based on the model and a wave field signal received by a wave detector, wherein the discrete velocity value sequence is determined based on the while-drilling engineering parameters; And the output module is used for determining a geological interpretation result of the region to be detected based on the initial speed model after iterative optimization.

Description

Seismic wave advanced detection method, device and system combined with geophysical prospecting Technical Field The invention relates to the technical field of seismic data processing, in particular to a seismic wave advanced detection method, device and system combined with geophysical prospecting. Background In the construction of major infrastructure engineering such as tunnels, subways, underground water conservancy junctions and the like, poor geologic bodies such as fault fracture zones, karst caverns, high-pressure water-rich areas and the like are often encountered in front of a palm face. The detection accuracy of geology in front of the face directly influences the construction safety and efficiency of a Tunnel Boring Machine (TBM). In the prior advanced detection technology system, geophysical prospecting is one of the most direct and reliable methods. Seismic wave detection is also an important geological detection method, and imaging detection is carried out on geological structures in a certain range in front of a tunnel face by utilizing the principle that manually excited seismic waves reflect and scatter on interfaces of different geological bodies. However, most geophysical prospecting methods can only perform linear detection, so that the geological structure of the whole area in front of the face is difficult to accurately obtain, the excitation mode is limited in seismic wave detection, the signal repeatability is poor in a traditional seismic wave excitation mode (such as an explosive), and the accuracy of detection results obtained by inversion based on the seismic wave excitation mode is limited. Disclosure of Invention The invention provides a seismic wave advanced detection method, device and system combined with geophysical prospecting, which are used for overcoming the defects of the geophysical prospecting method and the seismic wave detection method in advanced detection in the prior art and realizing the seismic wave detection method and device coupled with the geophysical prospecting. The invention provides a seismic wave advanced detection method combining geophysical prospecting, which comprises the following steps: acquiring drilling-while-drilling engineering parameters in the advanced drilling process by using a geophysical prospecting module, and inverting based on the drilling-while-drilling engineering parameters to obtain a three-dimensional geological attribute of a region to be measured; acquiring a plurality of groups of wave field signals received by a wave detector after exciting the seismic waves at a plurality of depth positions of the advanced borehole; Converting the three-dimensional geological attribute into an initial velocity model for seismic wave inversion, and constructing a constraint term based on a discrete velocity value sequence along a lead drilling track to perform iterative inversion so as to minimize the difference between a wave field signal generated based on the model and a wave field signal received by a wave detector, wherein the discrete velocity value sequence is determined based on the while-drilling engineering parameters; and determining a geological interpretation result of the region to be detected based on the initial velocity model after iterative optimization. According to the seismic wave advanced detection method combined with geophysical prospecting provided by the invention, the step of acquiring the while-drilling engineering parameters of the geophysical prospecting module in the advanced drilling process and obtaining the three-dimensional geological attribute of the region to be detected based on inversion of the while-drilling engineering parameters comprises the following steps: Determining the mechanical specific energy of the rock mass at the corresponding drilling position based on the drilling-while-drilling engineering parameters of each advanced drilling construction process of the region to be measured, and mapping the mechanical specific energy into single-axis compressive strength; And carrying out spatial interpolation on the uniaxial compressive strength of the plurality of advanced drilling holes in the region to be detected, and generating a three-dimensional geological attribute body of the region to be detected. According to the seismic wave advanced detection method combined with geophysical prospecting provided by the invention, the steps of converting the three-dimensional geological attribute into an initial velocity model for seismic wave inversion, constructing a constraint term based on a discrete velocity value sequence along an advanced drilling track and carrying out iterative inversion comprise the following steps: converting the three-dimensional geological attribute into a three-dimensional velocity model, and taking the three-dimensional velocity model as the initial velocity model; Constructing an objective function based on the initial velocity model: ; Where m is the model vector field