Geological exploration method and device using local relative gravity deviation

Abstract

The invention relates to a geological exploration method and device using local relative gravity deviation, and belongs to the technical field of geological exploration, the method comprises the following steps: using any point in a to-be-monitored area as a reference point, establishing a reference three-dimensional coordinate system, and determining the gravity direction of the reference point; obtaining a gravity deviation angle between the observation point and the reference point according to the gravity direction of the reference point based on the reference three-dimensional coordinate system; according to the size relation between the gravity deviation angle and a preset deviation threshold value, the gravity abnormal condition is determined, and the geological condition is determined according to the gravity abnormal condition. The technical problem that in the prior art, when deviation measurement is carried out by using local gravity, the gravity is only large and has no direction, so that inversion is greatly restricted in the fields of mineral exploration and the like is solved.

Description

Technical Field

[0001] The present invention relates to the field of gravity exploration technology, and in particular to an exploration method and device utilizing local relative gravity deviation. Background Art

[0002] Gravity is a very important parameter in geological exploration, which can reflect the distribution of underground rock and soil in a local area, geological structure characteristics, etc. Mineral exploration, cultural relics protection and other applications in local areas only need to obtain the local gravity acceleration. The existing gravity acceleration measurement technology uses Newton's second law to obtain the measured value of gravity acceleration from the distance and time of free fall. Commonly used gravity measurement equipment, such as CG-5, CG-6, etc., can measure relative gravity. With the advancement of technology, absolute gravity measurement equipment has been gradually put into use, such as cold atom quantum gravimeters, superconducting gravimeters, etc., and the measurement accuracy has also been greatly improved.

[0003] Relative gravimeters have high measurement sensitivity and low noise levels; absolute gravimeters have high measurement accuracy and do not require regular calibration. However, the gravity acceleration obtained by relative gravity measurement and absolute gravity measurement is a scalar, which only has the numerical value of gravity acceleration but no direction. Its role in gravity exploration is limited. In the fields of mineral exploration, it has a great restriction on inversion and seriously affects gravity interpretation.

[0004] Therefore, a new local gravity deviation measurement method is urgently needed to make up for the missing measurement of the direction of gravity acceleration and restore the gravity vector field to optimize the gravity analysis and inversion effects; and to improve the efficiency of local gravity deviation measurement, thereby greatly improving the application scenarios of gravity exploration. Summary of the invention

[0005] In view of this, it is necessary to provide an exploration method and device using local relative gravity deviation to solve the technical problem that when local gravity is used for deviation measurement in the prior art, gravity only has magnitude but no direction, which greatly restricts inversion in fields such as mineral exploration.

[0006] In order to solve the above problems, the present invention provides a geological exploration method using local relative gravity deviation, comprising: Take any point in the area to be monitored as the reference point, establish a reference three-dimensional coordinate system, and determine the gravity direction of the reference point; Based on the reference three-dimensional coordinate system, according to the gravity direction of the reference point, the gravity deviation angle between the observation point and the reference point is obtained; The gravity anomaly is determined based on the magnitude relationship between the gravity deviation angle and a preset deviation threshold, and the geological conditions are determined based on the gravity anomaly.

[0007] In a possible implementation, the reference point is the center point of the area to be detected; The Z-axis direction of the reference three-dimensional coordinate system is opposite to the gravity direction of the reference point; The X-axis direction of the reference three-dimensional coordinate system points to the east, and the Y-axis direction points to the south; The XOY plane of the reference three-dimensional coordinate system is a meridian section at the location of the reference point.

[0008] In a possible implementation, the step of obtaining the gravity deviation angle between the observation point and the reference point based on the reference three-dimensional coordinate system and the gravity direction of the reference point includes: Taking the observation point as the coordinate origin, construct the observation three-dimensional coordinate system; Based on the three-dimensional coordinate system, determine the initial gravity direction of the observation point; According to the influence of longitude and latitude on the gravity direction of different points, the corrected gravity direction of the observation point relative to the reference coordinate system is determined; The size of the gravity deviation angle is determined based on the angle between the initial gravity direction of the observation point and the corrected gravity direction of the observation point.

[0009] In a possible implementation, the obtaining the gravity deviation angle between the observation point and the reference point according to the gravity direction of the reference point based on the reference three-dimensional coordinate system also includes: Project the initial gravity direction of the observation point onto the Z axis of the reference coordinate system to obtain the first projected gravity direction; According to the first gravity projection direction, determine the projection angle of the gravity deviation angle on the xoy plane; The deviation direction of the gravity deviation angle is determined according to the projection angle.

[0010] In a possible implementation, determining the gravity anomaly according to the magnitude relationship between the gravity deviation angle and a preset deviation threshold value includes: Determine the gravity anomaly of the observation point according to the relationship between the gravity deviation angle and the preset deviation threshold; According to the deviation direction of the gravity deviation angle, the gravity deviation direction of the observation point is determined.

[0011] In a possible implementation, determining the gravity deviation of the observation point according to the relationship between the gravity deviation angle and a preset deviation threshold value includes: If the magnitude of the gravity deviation angle is equal to the preset deviation threshold, the projection angle is 0, and it is determined that the gravity acceleration of the observation point and the reference point are both in a normal state or in the same abnormal state; If the magnitude of the gravity deviation angle is not equal to the preset deviation threshold, it is determined that there is a deviation in the gravity acceleration between the observation point and the reference point.

[0012] In a possible implementation, determining geological conditions according to gravity anomalies includes: If there is a deviation in the gravitational acceleration, it means that there is an abnormality in the geology.

[0013] In a second aspect, the present invention further provides a geological exploration device using local relative gravity deviation, comprising: A reference determination module is used to establish a reference three-dimensional coordinate system with any point in the area to be monitored as a reference point, and determine the gravity direction of the reference point; The deviation angle determination module is used to obtain the gravity deviation angle between the observation point and the reference point based on the reference three-dimensional coordinate system and the gravity direction of the reference point; The abnormal situation determination module is used to determine the gravity abnormal situation according to the magnitude relationship between the gravity deviation angle and a preset deviation threshold, and determine the geological situation according to the gravity abnormal situation.

[0014] In a third aspect, the present invention further provides an electronic device, comprising: a processor and a memory; The memory stores a computer-readable program executable by the processor; When the processor executes the computer-readable program, the steps in the geological prospecting method using local relative gravity deviation as described above are implemented.

[0015] In a fourth aspect, the present invention also provides a computer-readable storage medium, which stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps in the geological exploration method using local relative gravity deviation as described above.

[0016] The beneficial effects of the present invention are as follows: first, any point in the area to be monitored is used as a reference point to establish a reference three-dimensional coordinate system, and the gravity direction of the reference point is determined; through the reference three-dimensional coordinate system, the gravity deviation angle between the observation point and the reference point is obtained; thus, according to the magnitude relationship between the gravity deviation angle and the preset deviation threshold, the gravity anomaly is determined, and the geological situation is determined according to the gravity anomaly. The present invention can provide a finer spatial resolution than the traditional gravity magnitude measurement by using gravity angle deviation measurement, especially in complex terrain or high noise environment, and can accurately distinguish tiny gravity anomalies. Not only can it reflect the gravity anomaly size of the observation point, but also the direction of the gravity anomaly. This method can be widely used in the fields of mineral resource exploration, cultural relics archaeology, geological survey, etc., especially when looking for mineral deposits with large density differences (such as metal deposits, oil and gas reservoirs), the effect is particularly significant. The gravity deviation angle measurement method proposed by the present invention has the characteristics of high measurement accuracy, low measurement cost, strong stability, etc., and has the advantage of high efficiency in particular for gravity anomaly measurement in local areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A method flow chart of an embodiment of a geological exploration method using local relative gravity deviation provided by the present invention; Figure 2 A schematic diagram of a reference coordinate system in a geological prospecting method using local relative gravity deviation provided by the present invention; Figure 3 A schematic diagram of the test point locations in the geological prospecting method using local relative gravity deviation provided by the present invention; Figure 4 In the geological exploration method using local relative gravity deviation provided by the present invention, the test point Establish the coordinate system after correcting the effects of longitude and latitude; Figure 5 A schematic diagram of gravity deviation decomposition in the geological exploration method using local relative gravity deviation provided by the present invention; Figure 6 It is a schematic diagram of an embodiment of a geological exploration device using local relative gravity deviation provided by the present invention; Figure 7 It is a schematic diagram of the operating environment of an electronic device provided by the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] The parameters obtained from existing gravity measurements are all scalars, which only have numerical values ​​but no direction. They are of limited use in gravity exploration and have a great impact on inversion in mineral exploration and other fields, which seriously affects gravity interpretation. Therefore, a new type of measurement device and method is urgently needed to make up for the lack of gravity measurement direction and restore the gravity vector field to improve the analysis and inversion effect of gravity, thereby greatly improving the application scenarios of gravity exploration.

[0020] A specific embodiment of the present invention discloses a geological exploration method using local relative gravity deviation, see Figure 1 ,include: S101, taking any point in the area to be monitored as a reference point, establishing a reference three-dimensional coordinate system, and determining the gravity direction of the reference point; S102, based on the reference three-dimensional coordinate system, according to the gravity direction of the reference point, obtaining the gravity deviation angle between the observation point and the reference point; S103, determining the gravity anomaly according to the magnitude relationship between the gravity deviation angle and a preset deviation threshold, and determining the geological condition according to the gravity anomaly.

[0021] In this embodiment, first, any point in the monitored area is taken as a reference point, a reference three-dimensional coordinate system is established, and the gravity direction of the reference point is determined; through the reference three-dimensional coordinate system, the gravity deviation angle between the observation point and the reference point is obtained; thus, according to the magnitude relationship between the gravity deviation angle and the preset deviation threshold, the gravity anomaly is determined, and the geological situation is determined according to the gravity anomaly. The present invention can provide a finer spatial resolution than the traditional gravity magnitude measurement by using gravity angle deviation measurement, especially in complex terrain or high noise environment, and can accurately distinguish tiny gravity anomalies. Not only can it reflect the gravity anomaly size of the observation point, but also the direction of the gravity anomaly. This method can be widely used in the fields of mineral resource exploration, cultural relics archaeology, geological survey, etc., especially when looking for mineral deposits with large density differences (such as metal deposits, oil and gas reservoirs), the effect is particularly significant. The gravity deviation angle measurement method proposed by the present invention has the characteristics of high measurement accuracy, low measurement cost, strong stability, etc., especially for the measurement of gravity anomalies in local areas, it has the advantage of high efficiency.

[0022] It should be noted that the area to be monitored is any area that needs to be geologically surveyed, or any area that needs to solve the gravity angular velocity. The reference point is any point in the area to be monitored. By establishing a gravity direction reference in the target area (local area, area to be monitored), the gravity directions of the remaining points are compared with the reference, and the direction deviation caused by the different longitudes and latitudes is deducted, so as to obtain the direction deviation of all points in the local area relative to the reference point, make up for the missing direction of gravity measurement, and thus enhance the role of gravity exploration.

[0023] Furthermore, the direction of gravity is vertically downward (generally believed to be pointing towards the center of the earth), and the direction of gravity at each point is different due to the differences in longitude and latitude.

[0024] Furthermore, the reference point is the center point of the area to be detected; the Z-axis direction of the reference three-dimensional coordinate system is opposite to the gravity direction of the reference point; the X-axis direction of the reference three-dimensional coordinate system points to the east, and the Y-axis direction points to the south; the XOY plane of the reference three-dimensional coordinate system is the meridian section at the location of the reference point. By establishing the reference coordinate system as shown above, the subsequent calculation of the deviation angle direction can be simplified.

[0025] It should be noted that, based on the reference three-dimensional coordinate system, the gravity deviation angle between the observation point and the reference point is obtained, and the gravity deviation angle is directly obtained by a gravity instrument in this embodiment.

[0026] Furthermore, in step S103, the preset deviation threshold is a user-defined angle parameter used to measure whether the gravity deviation value of the observation point represents gravity anomaly. The preset deviation threshold can be 0° or any other angle.

[0027] In some embodiments, obtaining the gravity deviation angle between the observation point and the reference point based on the reference three-dimensional coordinate system includes: Taking the observation point as the coordinate origin, construct the observation three-dimensional coordinate system; Based on the three-dimensional coordinate system, determine the initial gravity direction of the observation point; According to the influence of longitude and latitude on the gravity direction of different points, the corrected gravity direction of the observation point relative to the reference coordinate system is determined; The size of the gravity deviation angle is determined based on the angle between the initial gravity direction of the observation point and the corrected gravity direction of the observation point.

[0028] In this embodiment, any point in the local area is selected as the reference point, preferably the center point of the ground in the local area. The direction of gravity acceleration of the reference point is vertically downward, expressed as g, and a coordinate system is established with the point as the reference point, such as Figure 2 As shown, the direction of the Z axis is opposite to the direction of the local gravity acceleration g of the reference point, the X axis points to the east, the Y axis points to the south, and the XY plane is a tangent plane of the local meridian.

[0029] Furthermore, any ground observation point is selected in the local area , with observation point Create a coordinate system such as Figure 3 As shown, Axis Direction and Correction Point relative to The direction of the gravity acceleration g after the deviation of gravity acceleration caused by longitude and latitude is opposite. The axis points east, The axis points south, and The plane is a section through the local meridian.

[0030] It should be noted that since the earth is a curved surface, different points on the surface correspond to different longitudes and latitudes, and the earth's gravity is toward the center of the earth, so under normal geological conditions, the direction of gravity at different points is also different. With reference point The deviation of gravity acceleration caused by longitude and latitude can be used to obtain the corrected gravity direction, such as Figure 4 As shown. Among them, the observation point without gravity anomaly The corrected gravity direction is The local gravitational acceleration has the same direction, which is g.

[0031] Furthermore, if Figure 5 As shown, the observation point The actual gravitational acceleration is , the actual gravitational acceleration is With the corrected observation point Point relative to base point The angle between the gravity acceleration g after the gravity acceleration deviation caused by longitude and latitude is (Gravity deviation angle), The angle size can reflect the observation point Relative to the reference point Gravity deviation situation. exist The projection of the plane is , then the angle exist The projection of the plane is (Projection angle). The value range is [0,2 ), that is, the observation point At the reference point This coordinate system can be used in all directions of east, south, west and north. The size of indicates the magnitude of the gravity deviation. Indicates observation point Relative to reference point The direction of gravity deviation.

[0032] pass The direction of the gravity deviation angle can be determined.

[0033] In some embodiments, determining the gravity anomaly according to the magnitude relationship between the gravity deviation angle and a preset deviation threshold value includes: Determine the gravity anomaly of the observation point according to the relationship between the gravity deviation angle and the preset deviation threshold; According to the deviation direction of the gravity deviation angle, the gravity deviation direction of the observation point is determined.

[0034] In this embodiment, the preset deviation threshold is 0. If the size is 0, is also 0. Then the test point and The gravitational acceleration is completely matched, and the gravitational acceleration at the two points is normal or abnormal in the same direction.

[0035] If the angle If the size is not 0, then the test point and The gravity acceleration does not match, and there is a deviation in the gravity acceleration at the two points, which can be used to determine the reference point With test point Abnormal gravity acceleration.

[0036] Furthermore, in local gravity measurement, the measurement reference points are selected within the local area. and multiple observation points , , , ······ , the above methods are used to measure the gravity deviation angle , , , ····· ,Thus, we can obtain the gravity anomaly of multiple points in the local area.

[0037] Based on the above-mentioned geological exploration method using local relative gravity deviation, the embodiment of the present invention further provides a geological exploration device using local relative gravity deviation, please refer to Figure 6 ,include: The reference determination module 610 is used to establish a reference three-dimensional coordinate system with any point in the area to be monitored as a reference point, and determine the gravity direction of the reference point; The deviation angle determination module 620 is used to obtain the gravity deviation angle between the observation point and the reference point based on the reference three-dimensional coordinate system; The abnormality determination module 630 is used to determine the gravity anomaly according to the magnitude relationship between the gravity deviation angle and a preset deviation threshold, and determine the geological condition according to the gravity anomaly.

[0038] like Figure 7 As shown, based on the above geological exploration method using local relative gravity deviation, the present invention also provides an electronic device, which can be a computing electronic device such as a mobile terminal, a desktop computer, a notebook, a palm computer, and a server. The electronic device includes a processor 710, a memory 720, and a display 730. Figure 7 Only some components of the electronic device are shown, but it should be understood that it is not required to implement all of the components shown, and more or fewer components may be implemented instead.

[0039] In some embodiments, the memory 720 may be an internal storage unit of the electronic device, such as a hard disk or memory of the electronic device. In other embodiments, the memory 720 may also be an external storage electronic device of the electronic device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device. Further, the memory 720 may also include both an internal storage unit of the electronic device and an external storage electronic device. The memory 720 is used to store application software and various types of data installed in the electronic device, such as program codes installed in the electronic device. The memory 720 may also be used to temporarily store data that has been output or is to be output. In one embodiment, a geological exploration program 740 using local relative gravity deviation is stored on the memory 720, and the geological exploration program 740 using local relative gravity deviation can be executed by the processor 710, thereby realizing the geological exploration method using local relative gravity deviation in each embodiment of the present application.

[0040] In some embodiments, the processor 710 may be a central processing unit (CPU), a microprocessor or other data processing chip, used to run program codes or process data stored in the memory 720, such as executing a geological exploration method using local relative gravity deviation.

[0041] In some embodiments, the display 730 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, etc. The display 730 is used to display information on the geological exploration electronic device using the local relative gravity deviation and to display a visual user interface. The components 710-730 of the electronic device communicate with each other via a system bus.

[0042] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A geological exploration method using local relative gravity deviation, characterized in that: include: Take any point in the area to be monitored as the reference point, establish a reference three-dimensional coordinate system, and determine the gravity direction of the reference point; Based on the reference three-dimensional coordinate system, according to the gravity direction of the reference point, the gravity deviation angle between the observation point and the reference point is obtained; The gravity anomaly is determined based on the magnitude relationship between the gravity deviation angle and a preset deviation threshold, and the geological conditions are determined based on the gravity anomaly.

2. The geological prospecting method using local relative gravity deviation according to claim 1, characterized in that: The reference point is the center point of the area to be detected; The Z-axis direction of the reference three-dimensional coordinate system is opposite to the gravity direction of the reference point; The X-axis direction of the reference three-dimensional coordinate system points to the east, and the Y-axis direction points to the south; The XOY plane of the reference three-dimensional coordinate system is a meridian section at the location of the reference point.

3. The geological prospecting method using local relative gravity deviation according to claim 1, characterized in that: The method of obtaining the gravity deviation angle between the observation point and the reference point based on the reference three-dimensional coordinate system and the gravity direction of the reference point includes: Taking the observation point as the coordinate origin, construct the observation three-dimensional coordinate system; Based on the three-dimensional coordinate system, determine the initial gravity direction of the observation point; According to the influence of longitude and latitude on the gravity direction of different points, the corrected gravity direction of the observation point relative to the reference coordinate system is determined; The size of the gravity deviation angle is determined based on the angle between the initial gravity direction of the observation point and the corrected gravity direction of the observation point.

4. The geological prospecting method using local relative gravity deviation according to claim 3, characterized in that: The method of obtaining the gravity deviation angle between the observation point and the reference point based on the reference three-dimensional coordinate system and the gravity direction of the reference point also includes: Project the initial gravity direction of the observation point onto the Z axis of the reference coordinate system to obtain the first projected gravity direction; According to the first gravity projection direction, determine the projection angle of the gravity deviation angle on the xoy plane; The deviation direction of the gravity deviation angle is determined according to the projection angle.

5. The geological prospecting method using local relative gravity deviation according to claim 4, characterized in that: Determining the gravity anomaly according to the magnitude relationship between the gravity deviation angle and a preset deviation threshold value includes: Determine the gravity anomaly of the observation point according to the relationship between the gravity deviation angle and the preset deviation threshold; According to the deviation direction of the gravity deviation angle, the gravity deviation direction of the observation point is determined.

6. The geological prospecting method using local relative gravity deviation according to claim 5, characterized in that: Determining the gravity deviation of the observation point according to the relationship between the gravity deviation angle and the preset deviation threshold includes: If the magnitude of the gravity deviation angle is equal to the preset deviation threshold, the projection angle is 0, and it is determined that the gravity acceleration of the observation point and the reference point are both in a normal state or in the same abnormal state; If the magnitude of the gravity deviation angle is not equal to the preset deviation threshold, it is determined that there is a deviation in the gravity acceleration between the observation point and the reference point.

7. The geological prospecting method using local relative gravity deviation according to claim 6, characterized in that: Determining geological conditions according to gravity anomalies includes: If there is a deviation in the gravitational acceleration, it means that there is an abnormality in the geology.

8. A geological exploration device using local relative gravity deviation, characterized in that: include: A reference determination module is used to establish a reference three-dimensional coordinate system with any point in the area to be monitored as a reference point, and determine the gravity direction of the reference point; The deviation angle determination module is used to obtain the gravity deviation angle between the observation point and the reference point based on the reference three-dimensional coordinate system and the gravity direction of the reference point; The abnormal situation determination module is used to determine the gravity abnormal situation according to the magnitude relationship between the gravity deviation angle and a preset deviation threshold, and determine the geological situation according to the gravity abnormal situation.

9. An electronic device, characterized in that: include: Processor and memory; The memory stores a computer-readable program executable by the processor; When the processor executes the computer-readable program, the steps of the geological exploration method using local relative gravity deviation as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the steps in the geological exploration method using local relative gravity deviation as described in any one of claims 1-7.

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