阅读说明：本技术 基于地质约束的小范围磁场数据补缺处理方法 (Small-range magnetic field data filling processing method based on geological constraint ) 是由 王培建 张伟 李江坤 孟祥宝 汪远志 牛禹 郑圻森 江民忠 李兵海 张积运 胡国 于 2021-09-18 设计创作，主要内容包括：本发明涉及一种基于地质约束的小范围磁场数据补缺处理方法,通过收集工作区地质及磁性参数资料,对工作区磁测数据进行提取、处理,并提取磁测空白区范围。根据空白区内不同地层或岩体的分布及其磁性特征,建立基于地质约束的磁性体模型,结合磁测空白区边缘数据,根据磁性体模型开展基于边缘磁测数据约束的磁正演计算,然后逐条线拟合磁剖面曲线。提取拟合磁剖面数据,与各测区磁测数据网格进行拼接,形成完整磁测数据,作为进一步磁资料开发利用的基础资料。本发明解决了部分地区小范围缺少磁数据的问题,在不重新开展磁测的情况下提供一种填补磁数据空白的快速有效技术方法,从而节约成本并减少因实地勘查带来的环境破坏。(The invention relates to a geological constraint-based small-range magnetic field data vacancy filling processing method which comprises the steps of collecting geological and magnetic parameter data of a working area, extracting and processing magnetic measurement data of the working area, and extracting a magnetic measurement blank area range. According to the distribution of different stratums or rock masses in the blank area and the magnetic characteristics of the different stratums or rock masses, a magnetic body model based on geological constraint is established, magnetic forward modeling calculation based on edge magnetic measurement data constraint is carried out according to the magnetic body model by combining magnetic measurement blank area edge data, and then a magnetic profile curve is fitted line by line. And extracting fitting magnetic profile data, and splicing the fitting magnetic profile data with the magnetic measurement data grids of the measurement areas to form complete magnetic measurement data serving as basic data for further magnetic data development and utilization. The invention solves the problem that a small range of partial areas lack magnetic data, and provides a quick and effective technical method for filling the blank of the magnetic data under the condition of not developing magnetic measurement again, thereby saving the cost and reducing the environmental damage caused by field investigation.)

1. A small-range magnetic field data filling processing method based on geological constraint is characterized by comprising the following steps:

a. collecting a geological map of a working area, and carrying out vectorization processing on the geological map of the working area;

b. collecting magnetic parameter data of the working area and the periphery of the working area, and projecting point coordinates of each magnetic parameter onto the vectorized geological map obtained in the step a;

c. extracting and sorting the magnetic measurement data of the working area, and extracting the range coordinates of the magnetic measurement blank area;

d. b, laying data extraction lines in the blank area, projecting the data extraction lines onto the geological map obtained in the step b, analyzing the distribution states of different geological bodies passing through the data extraction lines, extracting geological nodes along the data extraction lines, and manufacturing geological sections along the extraction lines;

e. extracting the magnetic parameters of the geologic body passing through the data extraction line, performing magnetic parameter assignment on different geologic bodies on the geological section, and establishing a magnetic body section model based on geological constraint;

f. extracting existing magnetic measurement data distributed at the edge of the blank area along a data extraction line to form edge magnetic data, then importing the edge magnetic data into magnetic forward and backward modeling software, importing the magnetic cross section model based on geological constraint established in the step e, and developing forward modeling of the magnetic model;

g. continuously adjusting the depth and the spatial range of different geologic bodies on the end face of the model on the magnetic body section model based on geological constraint, and finely adjusting the magnetic parameters of the different geologic bodies until the two ends of the fitted forward magnetic data curve of the magnetic body section model based on geological constraint are superposed with the edge magnetic data;

h. modeling all the data extraction lines one by one, and obtaining fitting magnetic profile curve data according to forward modeling;

i. extracting the fitted magnetic profile data and the coordinates thereof on each data extraction line to form a plain format file, and gridding;

j. and e, gridding the working area magnetic measurement data in the step c, and splicing the gridded data with the gridded data obtained in the step i to form complete gridded magnetic measurement data.

2. The geological-constraint-based small-range magnetic field data completion processing method according to claim 1, wherein in the step c, collected magnetic measurement data of the working area are sorted, extracted and projected onto the same coordinate system to form a plain file for further utilization; and extracting the range of the working area of the magnetic method project developed by the predecessor, compiling a working degree chart, circling the range of the magnetic measurement blank area and extracting the coordinates of the magnetic measurement blank area.

3. The geological-constraint-based small-range magnetic field data completion processing method is characterized in that in the step d, the direction of the data extraction line is consistent with the direction of the measuring line of the surrounding magnetic measuring data as much as possible, the process is repeated for 500 m-1000 m, and the line spacing of the data extraction line is 200-500 m.

4. The geological-constraint-based small-range magnetic field data completion processing method according to claim 1, wherein in the step e, the assigned magnetic parameters comprise induced magnetic susceptibility, residual magnetic susceptibility, declination and declination.

5. The geological-constraint-based small-range magnetic field data completion processing method as claimed in claim 1, wherein in steps i and j, the gridding interval data is taken to extract 1/4 line intervals.

6. The geological-constraint-based small-range magnetic field data completion processing method according to claim 1, wherein in step j, gridding data is spliced by adopting a stitching method.

7. The geological-constraint-based small-range magnetic field data completion processing method according to claim 1, wherein in step b, the measurement location, the measurement number, the magnetic susceptibility and the residual magnetic susceptibility of the magnetic parameters are counted.

Technical Field

The invention relates to a magnetic field data filling method, in particular to a small-range magnetic field data filling processing method based on geological constraint.

Background

Some areas develop magnetic measurement work of different ages, different measurement scales and different acquisition modes, but local areas belong to blank areas of the magnetic measurement work, and due to the existence of the blank areas of the magnetic measurement, difficulty is faced in comprehensive utilization and development of regional magnetic data. Because the cost of collecting magnetic measurement data on the spot is also high, a fast, effective and low-cost magnetic data processing method and technology are urgently needed to be explored. With the increasing of the existing magnetic measurement data, the fusion development of the magnetic data is more urgent, and the method for further researching the magnetic data shortage has important significance for the development of the existing magnetic data in China, the reduction of the national financial expenditure and the reduction of the environmental damage caused by field exploration.

Disclosure of Invention

The invention aims to provide a small-range magnetic field data vacancy filling processing method based on geological constraints, so as to solve the problems that the existing magnetic measurement data is blank, the on-site exploration cost is high, and the environment is damaged.

The invention is realized by the following steps: a small-range magnetic field data filling processing method based on geological constraints comprises the following steps.

a. And collecting a geological map of the working area, and carrying out vectorization treatment on the geological map of the working area.

b. And (b) collecting magnetic parameter data of the working area and the periphery of the working area, counting the measurement positions, the measurement quantity, the magnetic susceptibility and the residual magnetic susceptibility of the magnetic parameters, and projecting the point coordinates of the magnetic parameters onto the vectorization geological map obtained in the step a.

c. And extracting and sorting the magnetic measurement data of the working area, and extracting the range coordinates of the magnetic measurement blank area.

d. And (c) laying data extraction lines in the blank area, projecting the data extraction lines onto the geological map obtained in the step (b), analyzing the distribution state of different geological bodies passing through the data extraction lines, extracting geological nodes along the data extraction lines, and manufacturing geological sections along the extraction lines.

e. And extracting the magnetic parameters of the geologic body passing through the data extraction line, performing magnetic parameter assignment on different geologic bodies on the geological section, and establishing a magnetic body section model based on geological constraint.

f. And e, extracting the existing magnetic measurement data distributed at the edge of the blank area along the data extraction line to form edge magnetic data, then importing the edge magnetic data into magnetic forward and backward modeling software, importing the magnetic cross section model based on geological constraint established in the step e, and developing magnetic model forward modeling.

g. And continuously adjusting the depth and the spatial range of different geologic bodies on the end face of the model on the magnetic body section model based on geological constraint, and finely adjusting the magnetic parameters of the different geologic bodies until the two ends of the fitted forward magnetic data curve of the magnetic body section model based on geological constraint coincide with the edge magnetic data.

h. Modeling is carried out on all data extraction lines one by one, and fitting magnetic profile curve data are obtained according to forward modeling.

i. And (4) extracting the data and the coordinates of the fit magnetic section on each data extraction line to form a plain format file, and gridding.

j. And e, gridding the working area magnetic measurement data in the step c, and splicing the gridded data with the gridded data obtained in the step i to form complete gridded magnetic measurement data.

Furthermore, in the step c, the collected magnetic measurement data of the working area are sorted, extracted and projected on the same coordinate system to form a clear code file for further utilization; and extracting the range of the working area of the magnetic method project developed by the predecessor, compiling a working degree chart, circling the range of the magnetic measurement blank area and extracting the coordinates of the magnetic measurement blank area.

Further, in the step d, the direction of the data extraction line is consistent with the measuring line direction of the surrounding magnetic measuring data as much as possible, the process is repeated for 500 m-1000 m, and the line spacing of the data extraction line is 200-500 m.

Further, in step e, the assigned magnetic parameters include induced magnetic susceptibility, residual magnetic susceptibility, declination, and declination.

Further, in steps i and j, the gridding interval data is fetched to extract 1/4 the line interval.

Further, in step j, the gridding data is spliced by adopting a stitching method.

Further, in step b, the measurement place, the measurement number, the magnetic susceptibility and the residual magnetic susceptibility of the magnetic parameter are counted.

The invention extracts and processes the magnetic measurement data of the working area by collecting geological and magnetic parameter data of the working area, and extracts the magnetic measurement blank area range. The geological features of the magnetic measurement blank area are analyzed, a magnetic body model based on geological constraints is established according to the distribution of different stratums or rock masses in the blank area and the magnetic features of the blank area, magnetic forward modeling calculation based on edge magnetic measurement data constraints is carried out according to the magnetic body model by combining the edge data of the magnetic measurement blank area, and then a magnetic profile curve is fitted line by line. And extracting the data of the fitted magnetic profile to form a grid file, and splicing the grid file with the magnetic data grids of each measuring area to form complete magnetic data serving as basic data for further magnetic data development and utilization. The invention solves the problem that a small range of partial areas lack magnetic data, and provides a quick and effective technical method for filling the blank of the magnetic data under the condition of not developing magnetic measurement again, thereby saving the cost and reducing the environmental damage caused by field investigation.

Drawings

FIG. 1 is a flow chart of the present invention.

Detailed Description

The present invention is further described in detail below with reference to the accompanying drawings, as shown in fig. 1.

a. And collecting a geological map of the working area, and carrying out vectorization treatment on the geological map of the working area.

Specifically, the collected geological map is a large-scale geological map, and after vectorization is carried out on the geological map, a foundation is provided for subsequent extraction of boundary coordinates of different stratums or rock masses in the blank area.

b. And (b) collecting magnetic parameter data of the working area and the periphery of the working area, counting parameters such as the measurement location, the measurement quantity, the magnetic susceptibility and the residual magnetic susceptibility of the magnetic parameters, and projecting the point coordinates of the magnetic parameters onto the vectorization geological map obtained in the step a.

c. And extracting and sorting the magnetic measurement data of the working area, and extracting the range coordinates of the magnetic measurement blank area.

Specifically, collected working area magnetic measurement data are sorted, extracted and projected onto the same coordinate system to form a plain code file for further utilization; and extracting the range of the working area of the magnetic method project developed by the predecessor, compiling a working degree chart, circling the range of the magnetic measurement blank area and extracting the coordinates of the magnetic measurement blank area.

d. And (c) laying data extraction lines in the blank area, projecting the data extraction lines onto the geological map obtained in the step (b), analyzing the distribution state of different geological bodies passing through the data extraction lines, extracting geological nodes along the data extraction lines, and manufacturing geological sections along the extraction lines.

The direction of the data extraction line is consistent with the measuring line direction of the surrounding magnetic measurement data as much as possible, the data extraction line is repeated for 500 m-1000 m, the line spacing of the data extraction line is 200-500 m, and the data extraction line is determined according to the surrounding measurement scale and keeps the principle of being approximately consistent.

e. And extracting the magnetic parameters of the geologic body passing through the data extraction line, performing magnetic parameter assignment on different geologic bodies on the geological section, and establishing a magnetic body section model based on geological constraint.

The magnetic parameters to be assigned comprise induced magnetic susceptibility, residual magnetic susceptibility, declination and declination.

f. And e, extracting the existing magnetic measurement data distributed at the periphery of the margin of the blank area along the data extraction line to form marginal magnetic data, then introducing the marginal magnetic data into magnetic forward and backward modeling software, introducing the magnetic cross section model based on geological constraint established in the step e, and developing magnetic model forward modeling.

g. And continuously adjusting the depth and the spatial range of different geologic bodies on the end face of the model on the magnetic body section model based on geological constraint, and finely adjusting the magnetic parameters of the different geologic bodies until the two ends of the fitted forward magnetic data curve of the magnetic body section model based on geological constraint coincide with the edge magnetic data.

h. Modeling is carried out on all data extraction lines one by one, and fitting magnetic profile curve data are obtained according to forward modeling.

i. And (3) extracting the data of the fitted magnetic section and the coordinates thereof on each data extraction line to form a plain format file, gridding the plain format file, and acquiring the data at the gridding intervals to extract 1/4 of the line intervals.

j. And (e) gridding the magnetic measurement data of the working area in the step (c), extracting 1/4 line spacing from the gridding spacing data, splicing the gridding spacing data with the gridding data obtained in the step (i), and splicing the gridding data by adopting a stitching method to form complete gridding magnetic measurement data which is used as a basis for further developing and utilizing magnetic data.

The invention extracts and processes the magnetic measurement data of the working area by collecting geological and magnetic parameter data of the working area, and extracts the magnetic measurement blank area range. The geological features of the magnetic measurement blank area are analyzed, a magnetic body model based on geological constraints is established according to the distribution of different stratums or rock masses in the blank area and the magnetic features of the blank area, magnetic forward modeling calculation based on edge magnetic measurement data constraints is carried out according to the magnetic body model by combining the edge data of the magnetic measurement blank area, and then a magnetic profile curve is fitted line by line. And extracting the data of the fitted magnetic profile to form a grid file, and splicing the grid file with the magnetic data grids of each measuring area to form complete magnetic data serving as basic data for further magnetic data development and utilization. The invention solves the problem that a small range of partial areas lack magnetic data, and provides a quick and effective technical method for filling the blank of the magnetic data under the condition of not developing magnetic measurement again, thereby saving the cost and reducing the environmental damage caused by field investigation.