Orienting and positioning method of three-component gradient measurement of magnetic fields inside wells for magnetic ores outside wells

A three-component, magnetic technology, applied in the direction of electrical/magnetic detection, measuring device, measuring angle, etc. for logging records, can solve the problem of horizontal anomalous field and inability to orient the ore body outside the well.

Active Publication Date: 2012-08-01
中色杰泰地球物理科技(北京)有限公司
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Problems solved by technology

Such a large background error will cause the horizontal anomaly field t

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  • Orienting and positioning method of three-component gradient measurement of magnetic fields inside wells for magnetic ores outside wells
  • Orienting and positioning method of three-component gradient measurement of magnetic fields inside wells for magnetic ores outside wells
  • Orienting and positioning method of three-component gradient measurement of magnetic fields inside wells for magnetic ores outside wells

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Embodiment Construction

[0096] The orientation method of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0097] The invention adopts the magnetic field gradient measurement in the well, which is not disturbed by the background field caused by inaccurate inclinometer measurement based on the non-magnetic principle, and can orient the magnetic ore body outside the well in all directions (including the east-west direction). The method for orienting the magnetic body in an all-round way downhole will be described in detail below through specific examples. The method includes two steps: orienting the magnetic body outside the well and positioning the magnetic body:

[0098] Step A, orienting the magnetic body outside the well:

[0099] Step A1) Install two sets of three-component magnetic measuring elements with the same direction on the upper and lower parts of the downhole probe respectively, extend the downhole probe into the well, and ob...

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Abstract

The invention provides an orienting and positioning method of three-component gradient measurement of magnetic fields inside wells for magnetic ores outside wells, which includes orienting magnetic ores outside wells and positioning ores. An adopted direction method of horizontal magnetic field gradient anomaly has the advantages of being not disturbed by ambient fields due to the inaccurate inclinometer of nonmagnetic principles, capable of positioning the magnetic ores outside wells omnibearingly; and not only suitable for positioning magnetic ores in the north-south direction of the drilling, but also capable of positioning magnetic ores in the east-west direction of the drilling; and solving the problem that the horizontal magnetic anomaly is incorrect due to the drift azimuth and magnetic ores in the east-west direction of the drilling cannot be positioned.

Description

technical field [0001] The invention relates to the field of geophysical magnetic prospecting, in particular to a method in which magnetic surveying in wells can conduct omnidirectional orientation to magnetic ore bodies found outside the well. Background technique [0002] The magnetic survey in the well uses drilling as a prospecting channel to go deep into the ground to search for ore in the space outside the well. It is an effective method that can really go deep into the ground and carry out deep prospecting. [0003] When a magnetic ore body outside the well is found in the well, the magnetic ore body should be located, that is, the buried depth of the ore body, the orientation relative to the drilling, and the distance from the drilling are determined. [0004] For the three-component magnetic survey system in the well, the buried depth of the ore body and the drilling distance can be determined by the vertical component anomaly; the drilling azimuth can be determine...

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Application Information

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IPC IPC(8): G01V3/18G01C1/00
Inventor 王庆乙李学圣邱钢徐立忠
Owner 中色杰泰地球物理科技(北京)有限公司
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