Induction type broadband 3-component borehole magnetic measuring sensor and borehole electromagnetic tomography method using the same

Abstract

Borehole electromagnetic exploration or tomography (EM tomography). An induction type broadband 3-component borehole magnetic measuring sensor can accurately and precisely measure a broadband magnetic field about x, y and z axes using a three-dimensional (3D) model within a borehole by monitoring natural variations in the earth's magnetic field or based on EM tomography using the borehole. The measuring sensor is applicable to energy resource fields such as petroleum and coal, mineral resources fields and civil engineering and environmental fields.

Description

technical field [0001] The present invention relates to borehole electromagnetic exploration or tomography (EM tomography), and more particularly, the present invention relates to an inductive three-component borehole magnetic field measurement sensor for monitoring natural changes in the Earth's magnetic field within a borehole or It can be applied to the field of energy resources such as oil and coal, mineral resources, civil engineering and the environment through electromagnetic exploration using boreholes, and can accurately and precisely measure broadband magnetic fields in three dimensions for the x-axis, y-axis, and z-axis in boreholes. . [0002] In addition, the present invention relates to a borehole electromagnetic prospecting method. As mentioned above, using an inductive three-component borehole magnetic field measurement sensor that can accurately and precisely three-dimensionally measure a broadband magnetic field in a borehole for the x-axis, y-axis, and z-axi...

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Problems solved by technology

[0022] On the other hand, in the case of borehole electromagnetic prospecting, the distance between two boreholes can be varied from tens of meters to hundreds of meters, and the resistivity of the formation can also be hundreds of ohm-m to tens of thousands of ohm-m. m is performed in various geological environments, so the frequency of electromagnetic waves used is several Hz to hundreds of kHz, and it is necessary to measure broadband with very high sensitivity. In this case, the fluxgate electromagnetic survey receiving It is difficult for the device to satisfy both bandwidth and sensitivity

[0023] Moreover, like the aforementioned U.S. Patent No. 7,030,617, neither the registered patent publication No. 10-0563542 nor the registered patent publication No. 10-0264630 proposes a specific configuration of a magnetic sensor capable of three-dimensional measurement.

[0024] In other words, for the borehole electromagnetic prospecting system used to explore the geology of the underground environment or the burial of resources, etc., the magnetic field sensor is composed of a three-axis magnetic field for detecting a three-component magnetic field of the x, y, and z axes. In addition to the sensor, various auxiliary devices such as a control device, a positioning device, a communication device, and a power supply device are provided together to form a sensor unit. The control device is used to control the sensor, and the positioning device is used to grasp the position of the sensor. The communication device is used to transmit the signal from the sensor, the power supply device is used to supply the power, the power source is used to make the sensor operate, but, as mentioned above, the above mentioned method has not been proposed in the prior art The specific composition of the sensor unit

[0025] Therefore, in order to solve the problems of the prior art as described above, it is preferable to provide a new borehole magnetic field measurement sensor and a borehole electromagnetic exploration method using it, which is suitable for use in geological or resource exploration for underground environments. Borehole electromagnetic prospecting system for buried or not, and made into an integrated module form, so that it can be easily installed in the borehole, and at the same time accurately and precisely measure the drill hole in three dimensions for broadband frequencies and for the x-axis, y-axis, and z-axis respectively magnetic field inside the hole, but no devices or methods are currently available to meet the stated needs

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