CN-121995507-A - Abnormal body positioning method and system combining drilling transient electromagnetic and geological radar

CN121995507ACN 121995507 ACN121995507 ACN 121995507ACN-121995507-A

Abstract

The invention discloses a method and a system for positioning an abnormal body by combining drilling transient electromagnetic and geological radar, and relates to the technical field of mine safety detection, wherein the method comprises the steps of synchronously collecting drilling transient electromagnetic data and geological radar data of a mining body to be analyzed, and generating a drilling transient electromagnetic imaging diagram and a drilling geological radar imaging diagram; the method comprises the steps of extracting two-dimensional coordinates of a target abnormal point in a borehole geological radar imaging diagram, determining corresponding target apparent resistivity, drawing an apparent resistivity contour diagram based on the target apparent resistivity in a target radial sectioning diagram of the borehole transient electromagnetic imaging diagram, determining a plurality of candidate three-dimensional coordinates of the target abnormal point, selecting at least one target characteristic point in the borehole geological radar imaging diagram, determining corresponding characteristic apparent resistivity at the target characteristic point, drawing a characteristic circle based on the target characteristic point, and screening the plurality of candidate three-dimensional coordinates to obtain geological abnormal body coordinates. The invention relieves the technical problems of insufficient positioning precision and reliability in the prior art.

Inventors

YIN SHAN
Xie Chenyuan
LI ZHONGHUI
SU BENYU
WANG ENYUAN
ZHANG CHAOLIN
NIU YUE
GONG YINGLI

Assignees

中国矿业大学

Dates

Publication Date: 20260508
Application Date: 20260202

Claims (10)

1. A method for locating anomalies by combining borehole transient electromagnetic and geological radar, the method comprising: synchronously acquiring drilling transient electromagnetic data and geological radar data of a mineral body to be analyzed, and preprocessing the drilling transient electromagnetic data and the geological radar data to generate a drilling transient electromagnetic imaging diagram and a drilling geological radar imaging diagram respectively; Extracting two-dimensional coordinates of a target abnormal point in the borehole geological radar imaging graph, wherein the two-dimensional coordinates comprise a drill rod advancing direction coordinate and a detection depth coordinate; determining a target apparent resistivity corresponding to the target abnormal point based on the transient electromagnetic distance of the target abnormal point, wherein the transient electromagnetic distance is the distance between the transient electromagnetic and the point to be detected; Drawing a visual resistivity contour map based on the target visual resistivity in a target radial cut-away map of the drilling transient electromagnetic imaging map, and determining a plurality of candidate three-dimensional coordinates of the target abnormal point based on the visual resistivity contour map and the detection depth coordinates of the target abnormal point; Selecting at least one target characteristic point from the borehole geological radar imaging graph, and determining the corresponding characteristic apparent resistivity at the target characteristic point based on the transient electromagnetic distance of the target characteristic point, wherein the coordinates of the target characteristic point and the target abnormal point in the drill rod advancing direction are the same; And drawing a characteristic circle based on the coordinate of the target characteristic point in the detection depth direction in the target radial sectional graph, and screening the plurality of candidate three-dimensional coordinates based on the characteristic apparent resistivity and the characteristic circle to obtain the geological abnormal body coordinate of the ore body to be analyzed, wherein the screening times are consistent with the selection number of the target characteristic point.
2. The method of claim 1, wherein the simultaneous acquisition and preprocessing of borehole transient electromagnetic data and geological radar data of the ore body to be analyzed comprises: Setting transient electromagnetic and geological radars at intervals of a preset distance in roadway drilling holes of ore bodies to be analyzed; And acquiring drilling transient electromagnetic data and geological radar data of the ore body to be analyzed based on the transient electromagnetic and the geological radar respectively, and preprocessing.
3. The method of claim 1, wherein determining a corresponding target apparent resistivity at the target outlier based on the transient electromagnetic distance of the target outlier comprises: determining a target apparent resistivity corresponding to the target abnormal point based on the transient electromagnetic distance of the target abnormal point and the corresponding relation between the drilling transient electromagnetic distance and the apparent resistivity; The corresponding relation between the drilling transient electromagnetic distance and apparent resistivity comprises the following steps: Where s is the borehole transient electromagnetic distance, K is the compensation coefficient, t is the delay time after the emission current is turned off, ρ is the resistivity, and μ 0 is the vacuum permeability.
4. The method of claim 1, wherein determining a plurality of candidate three-dimensional coordinates of the target outlier based on the apparent resistivity contour map and the detected depth coordinates of the target outlier comprises: drawing a target circle based on the detection depth coordinate of the target abnormal point in the target radial sectional view; determining three-dimensional coordinates of an intersection point of the apparent resistivity contour map and the target circle in the drilling transient electromagnetic imaging map as a plurality of candidate three-dimensional coordinates; Wherein the equation of the target circle includes The plurality of candidate three-dimensional coordinates are Satisfy the following requirements , And Y is the coordinate of the advancing direction of the drill rod, and r 0 is the coordinate of the detection depth.
5. The method of claim 4, wherein selecting at least one target feature point in the borehole geological radar imaging and determining a corresponding feature apparent resistivity at the target feature point based on a transient electromagnetic distance of the target feature point comprises: Selecting at least one target characteristic point from the drilling geological radar imaging diagram, wherein the two-dimensional coordinates of the target characteristic point R p is a selected parameter, and r max is a preset upper threshold; Calculating a transient electromagnetic distance of the target feature point based on the two-dimensional coordinates of the target feature point, wherein the transient electromagnetic distance calculation formula of the target feature point comprises: l is the distance between transient electromagnetic and geological radar arranged in the roadway drilling of the ore body to be analyzed; and determining the corresponding characteristic apparent resistivity at the target characteristic point based on the transient electromagnetic distance of the target characteristic point and the corresponding relation between the drilling transient electromagnetic distance and the apparent resistivity.
6. The method of claim 1, wherein screening the plurality of candidate three-dimensional coordinates based on the characteristic apparent resistivity and the characteristic circle to obtain geological anomaly coordinates of the ore body to be analyzed comprises: starting from the coordinate origin of the target radial sectional graph, respectively connecting with the plurality of candidate three-dimensional coordinates and extending until the candidate three-dimensional coordinates intersect with the characteristic circle at a plurality of corresponding characteristic intersection points; calculating the corresponding apparent resistivity at each characteristic intersection point based on the coordinates of the characteristic intersection points; Calculating the corresponding apparent resistivity at each characteristic intersection point and the error of the characteristic apparent resistivity respectively, and eliminating candidate three-dimensional coordinates corresponding to the error larger than a preset error value to obtain three-dimensional coordinates after screening; and if the candidate three-dimensional coordinates after screening are unique, determining the three-dimensional coordinates after screening as geological abnormal body coordinates of the ore body to be analyzed.
7. The method according to claim 6, wherein if the candidate three-dimensional coordinates after screening are not unique, repeating screening on the selected other feature points until the candidate three-dimensional coordinates after screening are unique, and determining the unique candidate three-dimensional coordinates as geological abnormal coordinates of the ore body to be analyzed.
8. The abnormal body positioning system for the combined drilling transient electromagnetic and geological radar is characterized by being used for realizing the abnormal body positioning method for the combined drilling transient electromagnetic and geological radar according to any one of claims 1-7, and comprises an acquisition module, an extraction module, a determination module, a candidate module, a selection module and a screening module, The acquisition module is used for synchronously acquiring drilling transient electromagnetic data and geological radar data of the ore body to be analyzed and preprocessing the drilling transient electromagnetic data and the geological radar data to respectively generate a drilling transient electromagnetic imaging diagram and a drilling geological radar imaging diagram; the extraction module is used for extracting two-dimensional coordinates of the target abnormal point in the borehole geological radar imaging graph, wherein the two-dimensional coordinates comprise drill rod advancing direction coordinates and detection depth coordinates; The determining module is used for determining the corresponding target apparent resistivity at the target abnormal point based on the transient electromagnetic distance of the target abnormal point, wherein the transient electromagnetic distance is the distance between the transient electromagnetic and the point to be detected; The candidate module is used for drawing a visual resistivity contour map based on the target visual resistivity in a target radial cut-away map of the drilling transient electromagnetic imaging map, and determining a plurality of candidate three-dimensional coordinates of the target abnormal point based on the visual resistivity contour map and the detection depth coordinates of the target abnormal point; the selecting module is used for selecting at least one target characteristic point from the drilling geological radar imaging graph, and determining the corresponding characteristic apparent resistivity at the target characteristic point based on the transient electromagnetic distance of the target characteristic point, wherein the coordinates of the target characteristic point and the target abnormal point in the drill rod advancing direction are the same; The screening module is used for drawing a characteristic circle based on the coordinate of the target characteristic point in the detection depth direction in the target radial sectional graph, and screening the candidate three-dimensional coordinates based on the characteristic apparent resistivity and the characteristic circle to obtain the geological abnormal body coordinate of the ore body to be analyzed, wherein the screening times are consistent with the selection number of the target characteristic point.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method according to any of claims 1-7 when executing the computer program.
10. A computer readable storage medium having stored therein program code which is callable by a processor to perform the method of any one of claims 1 to 7.

Description

Abnormal body positioning method and system combining drilling transient electromagnetic and geological radar Technical Field The invention relates to the technical field of mine safety detection, in particular to a method and a system for positioning an abnormal body by combining drilling transient electromagnetic and geological radar. Background The accurate positioning of geological abnormal bodies is a core technical bottleneck in the fields of mineral resource exploration, geological disaster prevention and control, major underground engineering construction and the like, and is directly related to engineering safety and resource development efficiency. From the background of industry development, as shallow easily-mined resources are increasingly exhausted, mineral exploration extends to deep parts of more than 1000 meters, deep geological conditions are more complex, abnormal bodies are more hidden, the traditional technology is difficult to penetrate complex stratum to realize accurate identification, and extreme weather frequent and ergonomic activities are aggravated, so that geological disasters such as landslide, mine water burst, cave-in and the like cause superbillions of direct economic losses in years, and advanced accurate calibration of geological abnormal bodies becomes a key of disaster prevention and control. The current mainstream geological radar and drilling transient electromagnetic detection technology have inherent limitations when being singly applied, namely the geological radar realizes high-resolution and rapid imaging by means of high-frequency electromagnetic waves, but the electromagnetic waves attenuate severely in water-rich stratum and high-conductivity stratum, the detection depth is usually not more than 30 meters, the detection depth is only 10-15 meters in complex stratum, and only two-dimensional section information can be provided, three-dimensional calibration cannot be realized, for example, a side karst cave is easily judged as a barrier right in front in advanced detection of a tunnel, the drilling transient electromagnetic detection depth can reach hundreds of meters and is sensitive to low-resistance abnormal bodies, the transverse resolution is 5-10 meters, small-sized abnormal bodies are difficult to identify, the small-sized abnormal bodies are influenced by the heterogeneity of underground media, a plurality of suspected abnormal points are easy to appear, the position of the unique abnormal bodies cannot be directly determined, and the condition of drilling void in mineral exploration frequently occurs. The existing combined detection technology fails to break through the core bottleneck, namely, the data fusion degree is low, two types of data are not synchronously acquired, the coordinate system is not uniform, the coordinate conversion lacks standards, the experience judgment is relied on, the abnormal region is simply overlapped, a quantization model is not established, the subjectivity is strong, the screening mechanism is single, a plurality of suspected abnormal point coordinates are easy to appear, the position of a unique geological abnormal body cannot be directly determined, and the multiple solutions of the abnormal points are difficult to eliminate. These problems result in insufficient positioning accuracy and reliability, and cannot meet the accurate requirements of deep exploration and major engineering. Disclosure of Invention In order to solve the technical problems in the prior art, the embodiment of the invention provides a method and a system for positioning an abnormal body of a combined drilling transient electromagnetic and geological radar. The technical scheme is as follows: In one aspect, an abnormal body positioning method of combined drilling transient electromagnetic and geological radar is provided, the method comprises the steps of synchronously collecting drilling transient electromagnetic data and geological radar data of a mineral body to be analyzed and preprocessing the drilling transient electromagnetic data and geological radar data, respectively generating a drilling transient electromagnetic imaging chart and a drilling geological radar imaging chart, extracting two-dimensional coordinates of target abnormal points in the drilling geological radar imaging chart, wherein the two-dimensional coordinates comprise drill rod advancing direction coordinates and detecting depth coordinates, determining target apparent resistivity corresponding to the target abnormal points based on transient electromagnetic distances of the target abnormal points, wherein the transient electromagnetic distances are distances between transient electromagnetic and to-be-detected points, drawing a target apparent resistivity contour chart based on the target apparent resistivity in a target radial cut-off chart of the drilling transient electromagnetic imaging chart, determining a plurality of candidate three-dimensional coordinates of the