A Concealed Resource Prediction Method and Rock Electromagnetic Logging System

An electromagnetism and well logging technology, applied in electromagnetic wave detection, water resources assessment, electric/magnetic detection for well logging records, etc., can solve problems such as narrow frequency range, single output parameter, poor recognition ability, etc.

Active Publication Date: 2021-03-30
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor prediction effect of concealed mineral resources (metal, oil and gas, etc.) caused by traditional resistivity logging technology due to problems such as single output parameters, narrow frequency range, poor recognition ability in complex environments, and shallow penetration depth. Provide a resource prediction method, use broadband electromagnetic waves (especially those with lower frequencies) to measure and analyze the complex impedance of mining areas, so as to improve the success rate of resource prediction in mining areas

Method used

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  • A Concealed Resource Prediction Method and Rock Electromagnetic Logging System
  • A Concealed Resource Prediction Method and Rock Electromagnetic Logging System
  • A Concealed Resource Prediction Method and Rock Electromagnetic Logging System

Examples

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Embodiment 1

[0047] The rock electromagnetics measurement system 1 based on the core complex impedance measurement provided in this embodiment, such as figure 1 As shown, it includes two containers containing copper sulfate colloid 13 and an impedance analyzer 12, and the rock core sample 11 is placed between the two containers. Copper sulfate colloid is obtained by mixing about 1L saturated copper sulfate solution and about 5Kg flour (clay can also be used instead). A through hole is opened at the position where the outer wall of the container is in contact with the rock core sample 11, and a conductive glue 16 is arranged between the position where the rock core sample is in contact with the copper sulfate colloid. The transmitting ports A and B of the impedance analyzer 12 are respectively connected with the copper plate 14 inserted into the copper sulfate colloid 13 through wires, and the receiving ports M and N of the impedance analyzer are respectively connected with the reference el...

Embodiment 2

[0050] The rock electromagnetics logging system a2 based on the logging technology provided in this embodiment, such as figure 2 As shown, it includes a transmitting and receiving device 21 placed on the ground and an electrode device 22 placed in the logging; the electrode device includes transmitting electrodes (A, B) and receiving electrodes (M, N), and the transmitting electrodes (A, B) The transmitting end of the transmitting and receiving device is connected through the transmission line, and the receiving electrodes (M, N) are connected with the receiving end of the signal transmitting and receiving device through the transmission line. The transmitting part of the transmitting and receiving device is used to transmit electromagnetic waves with a frequency range of 0.001 to 10000 Hz. A signal generator or other devices with electromagnetic wave transmitting functions can be used to transmit broadband electromagnetic wave signals with different set frequencies undergroun...

Embodiment 3

[0052] The rock electromagnetic logging system b3 based on logging technology provided by this embodiment, such as image 3 As shown, it includes a transmitting device 31 placed on the ground, a receiving device 32 and an electrode device 33 placed in the well logging, and the receiving device and the electrode device can be nested and installed together. The transmitting device is used to transmit electromagnetic waves with a frequency range of 0.001 to 10000 Hz. A signal generator or other devices with electromagnetic wave transmitting functions can be used to transmit broadband electromagnetic wave signals with different set frequencies underground and record the emission current. The receiving device can use a downhole electromagnetic receiver or a submarine electromagnetic receiver (the principle is the same as that of the ground electromagnetic receiver, but the volume can be as small as 15cm*5cm*5cm or even smaller) to record the AC voltage by measuring the receiving ele...

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Abstract

The invention discloses a concealed resource prediction method and a rock electromagnetic logging system, which are applied in the technical field of mineral and oil and gas resource exploration. The rock electromagnetic logging system provided by the present invention adopts a broadband (between 0.001 and 10000 Hz) frequency sweep mode, which can realize rock broadband complex impedance measurement, and conduct potential mineral deposits through the obtained rock electromagnetic characteristic factors alone or in combination with geochemical characteristics. Or oil and gas resource forecasting.

Description

technical field [0001] The invention belongs to the technical field of mineral resource exploration, and relates to mineral (oil and gas) logging and exploration, in particular to a concealed resource prediction method for stratum attribute identification and resource prediction, and a rock electromagnetic logging system used in the resource prediction method. Background technique [0002] Drilling (wellbore) is one of the most direct means of obtaining underground formation information, and it is also the most important exploration means for verifying and discovering hidden mineral (oil and gas) resources. Well logging (also known as geophysical logging) is a method of measuring geophysical parameters using the electrochemical properties, electrical conductivity, acoustic properties, radioactivity and other geophysical properties of rock formations. The commonly used logging methods are resistivity logging, electromagnetic induction logging and electromagnetic wave propagat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/18
CPCG01V3/18G01V3/30
Inventor 何兰芳
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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