CN-122018035-A - Ecological sensitive area copper mine prospecting method based on nondestructive geophysical detection

CN122018035ACN 122018035 ACN122018035 ACN 122018035ACN-122018035-A

Abstract

The invention relates to the technical field of geological exploration, in particular to a copper mine prospecting method of an ecological sensitive area based on nondestructive geophysical exploration, which comprises the following steps of firstly, obtaining an image of the earth surface of a target ecological sensitive area to generate a tunnel entrance distribution vector diagram; the method comprises the steps of carrying out gravity detection on a target ecological sensitive area to generate a three-dimensional gravity detection image, carrying out integrated analysis on a ground hole entrance distribution vector diagram and the three-dimensional gravity detection image, identifying low-density false anomalies caused by ground holes, and generating a correction scheme, and carrying out data correction and geologic body marking on the gravity detection image by combining correction data and typical density characteristics of copper ores. Aiming at the problems of gravity exploration false negative abnormality and covering up copper mine true abnormality caused by cave of animals in ecological sensitive areas such as alpine meadow and the like, the method takes accurate identification of the cave and targeted elimination of the false abnormality as cores, solves the problem of misjudgment of a gravity exploration target area, improves the positioning precision of the copper mine, and reduces ecological disturbance.

Inventors

YU HAIJUN
REN XIANG
HU GUO
JIANG JIAWEN

Assignees

云南省地质调查局

Dates

Publication Date: 20260512
Application Date: 20260205

Claims (10)

1. The method for searching the copper ores in the ecological sensitive area based on nondestructive geophysical detection is characterized by comprising the following steps of: Firstly, acquiring an image of the earth surface of a target ecology sensitive area based on an unmanned aerial vehicle image acquisition technology, introducing an acquired earth surface image into a preset earth hole identification model, extracting coordinates and inlet diameters of each earth hole inlet in the earth surface image, and generating an earth hole inlet distribution vector diagram; detecting the target ecology sensitive area based on a gravity detection technology, obtaining original gravity data, preprocessing the original gravity data, and converting the preprocessed original gravity data into a three-dimensional gravity detection image; Thirdly, carrying out integrated analysis on the hole distribution information and the three-dimensional gravity detection image in the hole entrance distribution vector diagram, identifying low-density false anomalies caused by holes through a hole anomaly judgment strategy, and generating a correction scheme; And step four, combining the correction data with typical density characteristics of copper ores, and carrying out data correction and geologic body marking on the gravity detection image.
2. The method for copper mine prospecting in an ecologically sensitive area based on lossless geophysical prospecting according to claim 1, wherein the unique ID, center coordinates and entrance diameter of each hole are marked in a hole entrance distribution vector diagram.
3. The method for copper mine prospecting in an ecologically sensitive area based on lossless geophysical prospecting according to claim 2, wherein in step one, a visible light image and an infrared imaging image of a target ecologically sensitive area are obtained based on unmanned aerial vehicle image acquisition technology; preprocessing a visible light image, then importing a preset hole identification model, and outputting a hole inlet identified in the visible light image; the method comprises the steps of obtaining a ground surface temperature abnormal region, taking the ground surface temperature abnormal region as a suspected hidden hole region, superposing an infrared image segment of the suspected hidden hole region with a visible light image segment at a corresponding position, inputting a preset hole identification model to verify whether the infrared image segment is a real hole entrance, extracting the center coordinates and the entrance diameter of the hole entrance if the infrared image segment passes the verification, marking the hole entrance distribution vector diagram, distinguishing the hole entrance from the hole entrance directly identified by the visible light image, and complementarily recording the temperature difference of the hole to improve the hole information dimension.
4. The method for searching copper ore in an ecologically sensitive area based on nondestructive geophysical exploration according to claim 3, wherein before temperature anomaly extraction is carried out on an infrared thermal imaging image, hole data obtained by visible light image identification is called, a avoidance search radius is set based on the hole entrance diameter, a repeated exclusion area is defined by taking the center coordinate of each visible hole as the center and the avoidance search radius as the radius in a coordinate system of the infrared thermal imaging image, in the subsequent temperature anomaly extraction process of the infrared thermal imaging image, if the center coordinate of a certain temperature anomaly falls into any one of the repeated exclusion areas or the overlapping area with the repeated exclusion area is more than or equal to 30%, the temperature anomaly is judged to be the visible hole repeated area, the visible hole repeated area is directly removed from an infrared analysis flow, the screening range of a suspected hidden hole area is not included, and the identification analysis operation is continuously carried out on the temperature anomaly which does not fall into the repeated exclusion area.
5. The method for copper mine prospecting in an ecologically sensitive area based on lossless geophysical prospecting according to claim 4, wherein the hole anomaly determination strategy comprises: A. The low density region extraction, namely defining a region with the gravity value smaller than a preset low density value as a low density region in a three-dimensional gravity detection image, defining all low density abnormal regions meeting the conditions, and recording the spatial range, amplitude and morphological characteristics of each low density abnormal region; B. connectivity and coordinate matching, namely distinguishing a false earth hole anomaly from a false geological anomaly by taking a distribution vector diagram of an earth hole entrance as a reference and through logic of 'coordinate space association, three-dimensional path connectivity scanning and anomaly type classification judgment'; C. And verifying and correcting the false anomaly of the ground hole, namely, through secondary exploration verification of the unmanned aerial vehicle, calculating the interference amplitude and the interference range of the false anomaly after the verification, and generating a ground hole false anomaly correction data table, wherein the ground hole false anomaly correction data table comprises false anomaly IDs, corresponding hole group IDs, interference amplitude, interference range and correction modes.
6. The method for searching copper ores in an ecologically sensitive area based on nondestructive geophysical detection according to claim 5, wherein coordinates of a hole entrance distribution vector diagram and a three-dimensional gravity detection image are unified, a central coordinate of each hole entrance is taken as an initial origin, a three-dimensional space tracking algorithm is adopted to scan paths along a path of a low-density area in the gravity detection image, the origin of the hole entrance is taken as a starting point, the spatial distribution path of the low-density area is tracked, whether a complete path continuously extending from the surface hole entrance to the underground exists is judged, and if yes, the false abnormality of the hole is judged; if the scanning finds that the low-density area only exists in isolation at a certain depth section of the underground, the low-density area is connected with a surface hole entrance without a continuous channel, and the low-density area is marked as a geological false abnormality.
7. The method for searching for copper ores in an ecologically sensitive area based on nondestructive geophysical detection according to claim 6, wherein in the fourth step, data correction and geological body marking are sequentially carried out on a gravity detection image by combining the correction data in the third step and typical density characteristics of the copper ores, and the method is specifically as follows: The method comprises the steps of firstly, importing correction amounts recorded in a ground hole false anomaly correction data table into a gravity detection image, and executing gravity value superposition correction operation on all areas judged to be ground hole false anomalies, after finishing gravity data correction, determining density conversion and marking standards by referring to density differences of copper ores and surrounding rocks, converting the gravity values in the corrected gravity detection image into density values corresponding to underground media, and setting three types of geological body marking standards based on conversion results: the high-density area, the corresponding density is more than or equal to 3.8g/cm < 3>, is marked as a suspected copper mine target area and is marked by a red solid line frame; a normal density zone, corresponding to a density of 2.4-3.0g/cm < 3 >, marked as a "surrounding rock zone" and filled with grey; Other abnormal areas with the corresponding density of 3.0-3.8g/cm3 or <2.4g/cm3 are marked as 'abnormal areas to be verified' and marked by yellow dotted frames; And finally, generating a copper mine suspected target area distribution map of the ecological sensitive area, and marking the central coordinate, the three-dimensional range and the corresponding density value of each suspected copper mine target area.
8. The method for searching copper ore in ecologically sensitive areas based on lossless geophysical exploration according to claim 7, wherein in the gravity data correction of the fourth step, a 'false earth hole anomaly correction data table' is firstly established to be spatially associated with a three-dimensional gravity exploration image, correction amounts are matched with corresponding false earth hole anomaly areas in the exploration image through false anomaly IDs, and if a plurality of false earth hole anomalies exist in a certain area, the arithmetic average value of the false anomaly correction amounts is taken as the final correction amount of the area.
9. The method for searching for copper ores in an ecologically sensitive area based on lossless geophysical exploration according to claim 8, wherein target reliability evaluation contents are also marked in a suspected target distribution map of copper ores in the ecologically sensitive area, and evaluation dimensions comprise matching degree of target density values and typical densities of the copper ores, and removal conditions of holes and other non-ore interferences.
10. The method for searching copper ores in an ecologically sensitive area based on lossless geophysical exploration according to claim 9, wherein a Bragg gravity anomaly-density conversion formula adapting to geological background of the ecologically sensitive area is adopted in the density conversion process, and surrounding rock density parameters are set based on actual measurement data of a target area.

Description

Ecological sensitive area copper mine prospecting method based on nondestructive geophysical detection Technical Field The invention relates to the technical field of geological exploration, in particular to an ecological sensitive area copper mine prospecting method based on nondestructive geophysical exploration. Background Geophysical exploration is a core technical means for copper ore prospecting, and the core principle is that the inherent difference of physical properties (density, magnetism, conductivity, elastic wave propagation speed and the like) of copper ores (such as chalcopyrite and bornite) and surrounding rocks is utilized to reversely push the distribution, burial depth and scale of underground ore bodies, so that the method has been widely applied to copper ore census and detailed investigation of conventional geological areas. For ecologically sensitive areas (such as alpine meadows) nondestructive detection is often used. Nondestructive detection refers to a technology of reversely pushing internal information by measuring physical property differences of a geologic body without damaging the original state of a detection object (soil, vegetation and stratum), and in the copper mine prospecting of a ecologically sensitive area, core methods can be divided into six categories according to physical principles, namely gravity exploration, magnetic exploration, electrical exploration, ground Penetrating Radar (GPR), remote sensing detection and seismic exploration (shallow layer). In ecological sensitive areas such as alpine meadows and the like, a large-scale cave system is formed by cave animals (for example, the depth of family cave groups of woodchuck can reach 0.5-3m, the diameter of the family cave groups is 0.2-1m, and the single group coverage area is over 100m & lt 2 & gt), most of air or loose filling soil is arranged in the caves, and the density difference of the large-scale cave system is formed with surrounding compact alpine meadow soil and target copper ore bodies, while gravity exploration is used as a core means for detecting deep copper ores in the ecological sensitive areas, core logic of the gravity exploration is that ore body distribution is reversely pushed by capturing stratum density difference, when gravity meter measuring points are erroneously distributed above the caves, local low-density false negative abnormality brought by the caves is preferentially captured, the amplitude of the abnormality is similar to the abnormal characteristics of underground caves and ore loose surrounding areas, the abnormal characteristics of the mine loose surrounding areas are extremely easily misjudged as non-mineral bodies, and further high-density positive abnormality produced by real copper ore bodies is directly covered or confused, so that the existing gravity exploration method is difficult to accurately judge the areas such as the alpine meadow and the like, the additional work resource can be difficultly and additionally disturbed, and the ecological sensitive areas can be verified. Therefore, the invention provides a copper mine prospecting method in an ecological sensitive area based on nondestructive geophysical detection, so as to solve the problems. Disclosure of Invention In order to solve the problems, the invention provides a method for searching for the copper ores in the ecological sensitive areas based on nondestructive geophysical detection, which is used for solving the problem of false negative anomaly of gravity exploration caused by cave of animals in the ecological sensitive areas such as alpine meadow and the like, and reducing ecological disturbance while realizing accurate positioning of the target area of the copper ores. In order to achieve the purpose, the technical scheme of the invention is as follows, the method for searching the copper ores in the ecologically sensitive area based on nondestructive geophysical detection comprises the following steps: Firstly, acquiring an image of the earth surface of a target ecology sensitive area based on an unmanned aerial vehicle image acquisition technology, introducing an acquired earth surface image into a preset earth hole identification model, extracting coordinates and inlet diameters of each earth hole inlet in the earth surface image, and generating an earth hole inlet distribution vector diagram; detecting the target ecology sensitive area based on a gravity detection technology, obtaining original gravity data, preprocessing the original gravity data, and converting the preprocessed original gravity data into a three-dimensional gravity detection image; Thirdly, carrying out integrated analysis on the hole distribution information and the three-dimensional gravity detection image in the hole entrance distribution vector diagram, identifying low-density false anomalies caused by holes through a hole anomaly judgment strategy, and generating a correction scheme; And step four, combining the correcti