Three-dimensional high definition electric resistivity exploration and direct imaging method

Abstract

The invention discloses a three-dimensional high-resolution resistivity prospecting and direct imaging method, the main content is to use a unipolar-dipole device for forming a mutually crossed orthogonal observation system in a total test area; the application of the three-dimensional high-resolution resistivity prospecting and direct imaging method can overcome the problems that the existing two-dimensional high-resolution resistivity prospecting method has inaccurate tunnel positioning and undetermined tunnel shape caused by the side effects. Compared with the general three-dimensional high-density resistivity prospecting method, the three-dimensional high-resolution resistivity prospecting and direct imaging method has high sensitivity to underground tunnels, thereby truly realizing the multiple coverage measurements of underground analysis and distinguishing units, having stronger anti-interference and static offset removing capabilities and easily realizing the rolling measurement and the seamless connection of the test area. The three-dimensional direct imaging method is fast and effective, and has no problem of difficult convergence. The method can obtain more precise information of the positions, the sizes and the shapes of the underground tunnels, thereby having great significance for the study of the shallow fine geological structure.

Description

technical field

[0001] The invention belongs to the field of geological exploration, in particular to a three-dimensional high-resolution resistivity exploration and direct imaging method. Background technique

[0002] In order to meet the demand for the detection of shallow fine geological structures, the high-density resistivity method was developed (Griffiths D H, Barker R D. Two-dimensional resistivity imaging and modeling in areas of complex geology. Journal of Applied Geophysics, 1993, 29: 211 ~226). The method adopts smaller electrode pitch and higher density electrode arrangement along the survey line, such as Wenner device, Schlumberger device, dipole-dipole, monopole-monopole, joint profile, intermediate gradient and other devices. Array observation, followed by inversion and fitting imaging. In the detection method with small pole distance and high density, the high-resolution resistivity method of monopole-dipole device is adopted (Oven T E. Detection and mappi...

Examples

Embodiment 1

[0065] Such as figure 1 , an orthogonal three-dimensional high-resolution resistivity exploration system with 17 lines and 17 points, A in the figure 1 ~A 25 Indicates the power supply electrode, MN indicates the measuring electrode, the recording point is the midpoint of MN, 1 / 1~17 / 17 indicates the measuring point, and the marking method is: line number / point number. For universality, the length in the figure is taken as unit distance length, and the distance between one measuring point is one unit length. At this time, the length of one unit is equal to 5m. Generally, the measuring point distance is 2m~10m, and the resolution is determined by the measuring point distance and the measuring line distance, that is, an analysis resolution unit is (2m~10m)×(2m~10m)×(2m~10m). If the designed maximum detection depth Depth max =A 1 A 3 , then with electrode A 1 The relevant observation area is A 1 A 3 ×A 1 A 11 Measuring points within the area, and A 2 The relevant obser...

technical field

[0001] The invention belongs to the field of geological exploration, in particular to a three-dimensional high-resolution resistivity exploration and direct imaging method. Background technique

[0002] In order to meet the demand for the detection of shallow fine geological structures, the high-density resistivity method was developed (Griffiths D H, Barker R D. Two-dimensional resistivity imaging and modeling in areas of complex geology. Journal of Applied Geophysics, 1993, 29: 211 ~226). The method adopts smaller electrode pitch and higher density electrode arrangement along the survey line, such as Wenner device, Schlumberger device, dipole-dipole, monopole-monopole, joint profile, intermediate gradient and other devices. Array observation, followed by inversion and fitting imaging. In the detection method with small pole distance and high density, the high-resolution resistivity method of monopole-dipole device is adopted (Oven T E. Detection and mappi...

Examples

Embodiment 1

[0065] Such as figure 1 , an orthogonal three-dimensional high-resolution resistivity exploration system with 17 lines and 17 points, A in the figure 1 ~A 25 Indicates the power supply electrode, MN indicates the measuring electrode, the recording point is the midpoint of MN, 1 / 1~17 / 17 indicates the measuring point, and the marking method is: line number / point number. For universality, the length in the figure is taken as unit distance length, and the distance between one measuring point is one unit length. At this time, the length of one unit is equal to 5m. Generally, the measuring point distance is 2m~10m, and the resolution is determined by the measuring point distance and the measuring line distance, that is, an analysis resolution unit is (2m~10m)×(2m~10m)×(2m~10m). If the designed maximum detection depth Depth max =A 1 A 3 , then with electrode A 1 The relevant observation area is A 1 A 3 ×A 1 A 11 Measuring points within the area, and A 2 The relevant obser...

Images