CN104977619B - The three-dimensional controllable source electromagnetic data acquisition method of the orientation all standing of one kind four - Google Patents
The three-dimensional controllable source electromagnetic data acquisition method of the orientation all standing of one kind four Download PDFInfo
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Abstract
The present invention is a kind of three-dimensional controllable source electromagnetic data acquisition method of four orientation all standing, and field source A is excited in four mutually orthogonal levels of surface deployment around exploration targets1B1、A2B2、A3B3、A4B4Four field sources are end to end, level excites four angle points of field source to be set to earth point, lay four grounded electrode, excite the square surrounded in field source in four mutually orthogonal levels or laid in rectangle and receive survey grid, four orientation all standings of composition excite the three-dimensional acquisition received in the middle of field source and rectangle.The present invention can be obviously improved illuminance, make measuring point signal relatively uniform, effectively eliminate or suppress difference or error that Source effects are produced, be that electromagnetic data processing method is improved there is provided new direction, form a kind of brand-new electromagnetic exploration method.
Description
Technical field
It is that new many field sources excite controllable source electromagnetic survey technology the present invention relates to geophysical exploration method, is specifically
The three-dimensional controllable source electromagnetic data acquisition method of the orientation all standing of one kind four.
Background technology
Traditional magneto-electrotelluric exploration utilizes natural field source, therefore without the concern for the laying of field source.It is widely used at present
Controllable source audio frequency electromagnetic exploration method and the controllable source electromagnetic method such as long skew transient electromagnetic exploitation method all only lay one and swash
Field source is sent out, can only be received in field source annex certain limit, when the excitation energy of a field source can not meet receiving point signal
During to-noise ratio requirement, correct position is just selected to lay field source again.There is a series of problems in the single signal for exciting field source：It is first
First, due to the complexity of subsurface structure, the exciting field in diverse location or orientation causes electricity due to earth formation lithology differentia influence
Magnetic field transmission process is different, and notable difference can be produced in receiving point；Second, source of leaving the theatre is far and near different, passes through ground, aerial and ground
The lower field signal composition difference for reaching receiving point is very big, i.e., illuminance is different, and therefore, the field source characteristic of receiving point has differences,
Go directly wave field for such as near region, predominantly underground, and therefore far field, receives predominantly from ground or airborne plane wave
Signal seriously influenceed by non-exploration targets, also there is transition region between near region and far field, its electromagnetic nature is increasingly complex；
Therefore, traditional controllable source electromagnetic prospecting is usually because Source effects can not eliminate its application effect very well and have a greatly reduced quality, even
Produce error result.
The content of the invention
Signal difference between field source can be made up it is an object of the present invention to provide pin, makes measuring point signal relatively uniform, effectively disappears
Remove or suppress the three-dimensional controllable source electromagnetic data acquisition method of four orientation all standings of difference or error of Source effects generation.
The present invention is realized by following scheme：
Around exploration targets field source A is excited in four mutually orthogonal levels of surface deployment1B1、A2B2、A3B3、A4B4, four
Field source is end to end to form square（Or rectangle）, level excites four angle points of field source to be set to earth point, lays four and connect
Ground electrode, excites the square surrounded in field source in four mutually orthogonal levels or reception survey grid, composition four is laid in rectangle
Orientation all standing excites the three-dimensional acquisition received in the middle of field source and rectangle.
Described reception survey grid density（Measuring point spacing）For 25-200 meters, each measuring point lays an acquisition station, acquisition station
Single track or 2 roads or 3 roads or 4 roads or 5 roads, measurement five component electromagnetics or wherein certain several component, five components be respectively with
Excite field source parallel and vertical horizontal electric field component Ex, Ey, horizontal component ofmagnetic field Hx, Hy and the magnetic field Hz perpendicular to ground.
If exploration targets strike length is more than 5-8km, two or more four orientation all standings can be laid and swashed
Field source is sent out, the orientation all standing of each two four wants overlapping 20% area between exciting field source.
It is square or rectangle that four described mutually orthogonal levels, which excite field source,.
Described level excites field source A1B1With A2B2Share an earth point, B1With A2It is to be connected on same earth point；
A2B2With A3B3Share an earth point, B2With A3It is to be connected on same earth point；A3B3With A4B4Share an earth point, B3With
A4It is to be connected on same earth point；A4B4With A1B1Share an earth point, B4With A1It is to be connected on same earth point.
Described level excites the field source side ratio big 10-30% of exploration targets length, is 10km to the maximum.
Instant invention overcomes in conventional method, be present a series of problems in the single signal for exciting field source, can be obviously improved
Illuminance, makes measuring point signal relatively uniform, difference or error that Source effects are produced effectively is eliminated or suppress, especially for electromagnetism
Data processing method is improved there is provided new direction, and breakthrough effect will be brought to controllable source electromagnetic survey, is formed
A kind of brand-new electromagnetic survey technology.
Brief description of the drawings
The orientation all standing of Fig. 1 controllable sources electromagnetic survey four excites collection artwork；
The orientation all standing of Fig. 2 controllable sources electromagnetic survey four excites collection example 1；
Four orientation covering exciting field collection example 2 overlapping Fig. 3 two.
Embodiment
Below in conjunction with accompanying drawing and the example in detail present invention.
Fig. 1 is that the orientation all standing of controllable source electromagnetic survey four of the present invention excites collection artwork.
Around exploration targets field source A is excited in four mutually orthogonal levels of surface deployment1B1、A2B2、A3B3、A4B4, four
Field source is end to end, and level excites four angle points of field source to be set to earth point, lays four grounded electrode, at four mutually just
The level of friendship excites surrounded in field source square or rectangle in lay receive survey grid, composition four orientation all standings excite field source and
The three-dimensional acquisition received in the middle of rectangle.
Described reception survey grid density（Measuring point spacing）For 25-200 meters, each measuring point lays an acquisition station, acquisition station
Single track or 2 roads or 3 roads or 4 roads or 5 roads, measurement five component electromagnetics or wherein certain several component, five components be respectively with
Excite field source parallel and vertical horizontal electric field component Ex, Ey, horizontal component ofmagnetic field Hx, Hy and the magnetic field Hz perpendicular to ground.
If exploration targets strike length is more than 5-8km, two or more four orientation all standings can be laid and swashed
Field source is sent out, the orientation all standing of each two four wants overlapping 20% area between exciting field source.
Described level excites field source A1B1With A2B2Share an earth point, B1With A2It is to be connected on same earth point；
A2B2With A3B3Share an earth point, B2With A3It is to be connected on same earth point；A3B3With A4B4Share an earth point, B3With
A4It is to be connected on same earth point；A4B4With A1B1Share an earth point, B4With A1It is to be connected on same earth point.
Described level excites the field source side ratio big 10-30% of exploration targets length, is 10km to the maximum.
Fig. 2 of the present invention is instantiation, and field source is excited in four mutually orthogonal levels of surface deployment around exploration targets
A1B1、A2B2、A3B3、A4B4, four field sources are end to end, and level excites four angle points of field source to be set to earth point, lays four
Earth electrode, excites the square surrounded in field source in four mutually orthogonal levels or reception survey grid, composition is laid in rectangle
Four orientation all standings excite the three-dimensional acquisition received in the middle of field source and rectangle.
Described reception survey grid density（Measuring point spacing）For 25 meters, each measuring point lays an acquisition station, and acquisition station is 4
Road, measures four electromagnetic field components, i.e., with exciting field source parallel and vertical horizontal electric field component Ex, Ey, horizontal component ofmagnetic field
Hx、Hy。
Exploration targets strike length is less than 3km, lays a four orientation all standings and excites field source, the length of four field sources is equal
For 4km.
Described level excites field source A1B1With A2B2Share an earth point, B1With A2It is to be connected on same earth point；
A2B2With A3B3Share an earth point, B2With A3It is to be connected on same earth point；A3B3With A4B4Share an earth point, B3With
A4It is to be connected on same earth point；A4B4With A1B1Share an earth point, B4With A1It is to be connected on same earth point.
Described level excites field source length of side 4km, bigger than exploration targets length by 25%.
The present invention such as Fig. 3 is example 2.Around exploration targets field source, four are excited in 2 four or four orientation all standings of surface deployment
Individual level excites field source A1B1、A2B2、A3B3、A4B4, four field sources are end to end, and level excites four angle points of field source to be set to
Earth point, lays four grounded electrode, is excited in four mutually orthogonal levels and reception is laid in the square surrounded in field source
Survey grid, square field source length of side 4km, four orientation all standings of composition excite what is received in the middle of the square that field source and field source are surrounded
Three-dimensional acquisition.
Described reception survey grid density（Measuring point spacing）For 200 meters, each measuring point lays an acquisition station, and acquisition station is 4
Road, measurement 4 component electromagnetics, i.e., with exciting field source parallel and vertical horizontal electric field component Ex, Ey, horizontal component ofmagnetic field Hx,
Hy。
, it is necessary to lay a four orientation all standings again field source is excited because exploration targets strike length is more than 5km, it is and previous
The all standing of individual four orientation wants overlapping 20% area between exciting field source.
2 described four mutually orthogonal levels excite field source to be square.
Described level excites field source A1B1With A2B2Share an earth point, B1With A2It is to be connected on same earth point；
A2B2With A3B3Share an earth point, B2With A3It is to be connected on same earth point；A3B3With A4B4Share an earth point, B3With
A4It is to be connected on same earth point；A4B4With A1B1Share an earth point, B4With A1It is to be connected on same earth point.
Described level excites that field source side ratio exploration targets length is big by 20%, and the length of side is 4km.
In example 2, subsurface reservoir target sizes 3x5km lays two overlapping four orientation coverings and excites field source, (as schemed
3), each four mutually perpendicular levels excite field source, and likeness in form is square, length of side 4km, and four angle points are earth point, lay four
Individual earth electrode, receives survey grid and is laid in above goal in research, and four excite in surrounded square.Four horizontal exciting fields
Source is respectively A1B1、A2B2、A3B3、A4B4, each long 4km of field source, meanwhile, make A1B1With A2B2Share an earth point, B1With A2It is
It is connected on same earth point, equally, A2B2With A3B3Share an earth point, B2With A3It is to be connected on same earth point
, A3B3With A4B4Share an earth point, B3With A4It is connected on same earth point, A4B4With A1B1Share a ground connection
Point, B4With A1It is connected on same earth point, four field sources are end to end, receives survey grid and be laid in ground above goal in research
Face (such as Fig. 3).And field source survey grid is 3x3km, and each measuring point lays a five component acquisition stations, measurement five component electromagnetics, i.e.,
Horizontal electric field component Ex, Ey parallel and vertical AB, horizontal component ofmagnetic field Hx, Hy and vertical magnetic field Hz（Such as Fig. 3）.Complete first
After individual four orientation is excited and measured, by the whole mobile 7 measuring points position in cubic potential field source, make two cubic potential field sources overlapping, such as figure
Shown in dotted line.
Claims (4)
1. a kind of four orientation all standing three-dimensional controllable source electromagnetic data acquisition method, feature is realized by following scheme：
Around exploration targets field source A is excited in four mutually orthogonal levels of surface deployment1B1、A2B2、A3B3、A4B4, four field sources
End to end to form square or rectangle, level excites four angle points of field source to be set to earth point, lays four grounded electrode,
To excite lay in field source in four mutually orthogonal levels and receive survey grid, four orientation all standings of composition excite field source and field source to surround
Square or rectangle in the middle of receive three-dimensional acquisition；
Described exploration targets strike length is more than 5-8km, lays two or more four orientation all standings and excites field source,
The orientation all standing of each two four wants overlapping 20% area between exciting field source.
2. method according to claim 1, feature is that described reception survey grid density is 25-200 meters, each measuring point lays one
Acquisition station, acquisition station is single track or 2 roads or 3 roads or 4 roads or 5 roads, wherein measurement five component electromagnetics or certain several component, five
Component is respectively and excites field source parallel and vertical horizontal electric field component Ex, Ey, horizontal component ofmagnetic field Hx, Hy and perpendicular to ground
The magnetic field Hz in face.
3. method according to claim 1, feature is that described level excites field source A1B1With A2B2Share an earth point, B1With
A2It is to be connected on same earth point；A2B2With A3B3Share an earth point, B2With A3It is to be connected on same earth point；A3B3
With A4B4Share an earth point, B3With A4It is to be connected on same earth point；A4B4With A1B1Share an earth point, B4With A1
It is to be connected on same earth point.
4. method according to claim 1, feature is that described level excites the big 10- of field source side ratio exploration targets length
30%, it is 10km to the maximum.
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| CN108614299A (en) * | 2016-12-09 | 2018-10-02 | 中国石油天然气股份有限公司 | electromagnetic exploration method and system |
| CN106842334A (en) * | 2016-12-12 | 2017-06-13 | 中国石油天然气集团公司 | A kind of electromagnetic exploration method and device |
| CN107356976B (en) * | 2017-07-14 | 2023-06-23 | 江苏建筑职业技术学院 | Portable assembled transient electromagnetic coil device |
| CN109884714B (en) * | 2019-03-05 | 2021-11-16 | 中国地质科学院地球物理地球化学勘查研究所 | Controllable source electromagnetic measurement method, device and storage medium thereof |
| CN111965718B (en) * | 2019-05-20 | 2023-09-26 | 中国石油天然气集团有限公司 | Electromagnetic data acquisition method and device based on four-direction excitation |
| CN116088059B (en) * | 2023-04-10 | 2023-07-18 | 山东省煤田地质规划勘察研究院 | Artificial source frequency domain electromagnetic exploration method and system based on double-source error frequency emission |
| CN116088060B (en) | 2023-04-12 | 2023-06-30 | 山东大学 | Artificial source electromagnetic exploration system and method based on orthogonal field source-error frequency excitation |
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| JP5424295B2 (en) * | 2008-06-16 | 2014-02-26 | 独立行政法人石油天然ガス・金属鉱物資源機構 | Underground electromagnetic exploration method |
| CN101620277A (en) * | 2009-07-28 | 2010-01-06 | 甘肃铁道综合工程勘察院有限公司 | Controlled source audio-frequency magnetotelluric (CSAMT) double-transmitting multi-receiving data acquiring system and CSAMT double-transmitting multi-receiving data acquiring method |
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