CN104977619A - Four-orientation full-coverage three-dimensional controllable source electromagnetic data acquisition method - Google Patents
Four-orientation full-coverage three-dimensional controllable source electromagnetic data acquisition method Download PDFInfo
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- CN104977619A CN104977619A CN201410139125.2A CN201410139125A CN104977619A CN 104977619 A CN104977619 A CN 104977619A CN 201410139125 A CN201410139125 A CN 201410139125A CN 104977619 A CN104977619 A CN 104977619A
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Abstract
The invention discloses a four-orientation full-coverage three-dimensional controllable source electromagnetic data acquisition method which comprises the step of arranging four horizontal exciting field sources A1B1, A2B2, A3B3, A4B4 on the ground around an exploration object. The four horizontal exciting field sources which are mutually orthogonal are connected in a head-tail way. The four corner points of the horizontal exciting field sources are set as ground points. Four grounding electrodes are arranged on the four corner points. Receiving measurement nets are arranged inside a square or rectangle surrounded by the four mutually orthogonal horizontal exciting field sources to form three-dimensional acquisition characterized by four-orientation full-coverage exciting field source and rectangle center receiving. The illumination intensity can be obviously improved. Measuring point signals are made relatively uniform. Differences or errors caused by field source effects can be effectively eliminated or suppressed. A new direction for improving electromagnetic data processing methods is provided. A brand new electromagnetic exploration method is further formed.
Description
Technical field
The present invention relates to geophysical exploration method, is that novel many field sources excite controllable source electromagnetic survey technology, specifically a kind of four orientation all standing three-dimensional controllable source electromagnetic data acquisition method.
Background technology
Traditional magneto-electrotelluric exploration utilizes natural field source, does not therefore need the laying considering field source.The controllable source electromagnetic methods such as the controllable source audio frequency electromagnetic exploration method of current widespread use and long skew transient electromagnetic method of exploration are all only laid one and are excited field source, can only receive in field source annex certain limit, when the excitation energy of a field source can not meet the to-noise ratio requirement of acceptance point signal, correct position is just selected again to lay field source.There is series of problems in the single signal of field source that excites: first, due to the complicacy of underground structure, and the exciting field in diverse location or orientation, due to stratal configuration lithology differentia influence, causes electromagnetic field transmitting procedure different, can produce notable difference at acceptance point; The second, source of leaving the theatre is far and near different, and the field signal composition difference being arrived acceptance point by ground, aerial and underground is very large, namely illuminance is different, therefore, the field source characteristic of acceptance point there are differences, such as near region, be mainly underground to go directly wave field, and far field is mainly from ground or airborne plane wave, therefore, the signal received seriously affects by non-exploration targets, between near region and far field, also there is zone of transition, its electromagnetic nature is more complicated; Therefore, traditional controllable source electromagnetic prospecting usually because Source effects can not be eliminated its effect very well and have a greatly reduced quality, even produces error result.
Summary of the invention
The object of the invention is to provide pin can make up signal difference between field source, makes measuring point signal relatively uniform, effectively eliminates or suppress the difference of Source effects generation or the four orientation all standings three-dimensional controllable source electromagnetic data acquisition methods of error.
The present invention is realized by following scheme:
Field source A is excited in the level that surface deployment four is mutually orthogonal around exploration targets
1b
1, A
2b
2, A
3b
3, A
4b
4four end to end formation square (or rectangle) of field source, level excites four of field source angle points to be set to earth point, lay four grounded electrode, four mutually orthogonal levels excite in field source around square or rectangle in lay and receive survey grid, form four orientation all standings and excite the three-dimensional acquisition received in the middle of field source and rectangle.
Described reception survey grid density (measuring point spacing) is 25-200 rice, each measuring point lays an acquisition station, acquisition station is single track or 2 roads or 3 roads or 4 roads or 5 roads, measure five component electromagnetic fields or wherein certain several component, five components are and the horizontal electric field component Ex exciting field source parallel with vertical, Ey respectively, horizontal component ofmagnetic field Hx, Hy and the magnetic field Hz perpendicular to ground.
If exploration targets strike length is greater than 5-8km, then can lays two or more four orientation all standings and excite field source, every two four orientation all standings excite between field source and want overlapping 20% area.
Described four mutually orthogonal levels excite field source to be square or rectangle.
Described level excites field source A
1b
1with A
2b
2share an earth point, B
1with A
2be connected on same earth point; A
2b
2with A
3b
3share an earth point, B
2with A
3be connected on same earth point; A
3b
3with A
4b
4share an earth point, B
3with A
4be connected on same earth point; A
4b
4with A
1b
1share an earth point, B
4with A
1be connected on same earth point.
Described level excites the large 10-30% of field source side ratio exploration targets length, is 10km to the maximum.
Instant invention overcomes in conventional method, there is series of problems in the single signal of field source that excites, obviously can improve illuminance, make measuring point signal relatively uniform, the difference that effective elimination or compacting Source effects produce or error, especially electromagnetic data processing method is improved and is provided new direction, by bringing breakthrough effect to controllable source electromagnetic survey, forms a kind of brand-new electromagnetic survey technology.
Accompanying drawing explanation
Fig. 1 controllable source electromagnetic survey four orientation all standing excites collection artwork;
Fig. 2 controllable source electromagnetic survey four orientation all standing excites and gathers example 1;
The four orientation covering exciting fields collection examples 2 that Fig. 3 two is overlapping.
Embodiment
Below in conjunction with accompanying drawing and example in detail the present invention.
Fig. 1 is that controllable source electromagnetic survey four orientation all standing of the present invention excites collection artwork.
Field source A is excited in the level that surface deployment four is mutually orthogonal around exploration targets
1b
1, A
2b
2, A
3b
3, A
4b
4four field sources are end to end, level excites four of field source angle points to be set to earth point, lay four grounded electrode, four mutually orthogonal levels excite in field source around square or rectangle in lay and receive survey grid, form four orientation all standings and excite the three-dimensional acquisition received in the middle of field source and rectangle.
Described reception survey grid density (measuring point spacing) is 25-200 rice, each measuring point lays an acquisition station, acquisition station is single track or 2 roads or 3 roads or 4 roads or 5 roads, measure five component electromagnetic fields or wherein certain several component, five components are and the horizontal electric field component Ex exciting field source parallel with vertical, Ey respectively, horizontal component ofmagnetic field Hx, Hy and the magnetic field Hz perpendicular to ground.
If exploration targets strike length is greater than 5-8km, then can lays two or more four orientation all standings and excite field source, every two four orientation all standings excite between field source and want overlapping 20% area.
Described level excites field source A
1b
1with A
2b
2share an earth point, B
1with A
2be connected on same earth point; A
2b
2with A
3b
3share an earth point, B
2with A
3be connected on same earth point; A
3b
3with A
4b
4share an earth point, B
3with A
4be connected on same earth point; A
4b
4with A
1b
1share an earth point, B
4with A
1be connected on same earth point.
Described level excites the large 10-30% of field source side ratio exploration targets length, is 10km to the maximum.
Fig. 2 of the present invention is instantiation, excites field source A around exploration targets in the level that surface deployment four is mutually orthogonal
1b
1, A
2b
2, A
3b
3, A
4b
4four field sources are end to end, level excites four of field source angle points to be set to earth point, lay four grounded electrode, four mutually orthogonal levels excite in field source around square or rectangle in lay and receive survey grid, form four orientation all standings and excite the three-dimensional acquisition received in the middle of field source and rectangle.
Described reception survey grid density (measuring point spacing) is 25 meters, and each measuring point lays an acquisition station, and acquisition station is 4 roads, measures four electromagnetic field components, namely with the horizontal electric field component Ex exciting field source parallel with vertical, Ey, and horizontal component ofmagnetic field Hx, Hy.
Exploration targets strike length is less than 3km, and lay four orientation all standings and excite field source, the length of four field sources is 4km.
Described level excites field source A
1b
1with A
2b
2share an earth point, B
1with A
2be connected on same earth point; A
2b
2with A
3b
3share an earth point, B
2with A
3be connected on same earth point; A
3b
3with A
4b
4share an earth point, B
3with A
4be connected on same earth point; A
4b
4with A
1b
1share an earth point, B
4with A
1be connected on same earth point.
Described level excites field source length of side 4km, and larger than exploration targets length 25%.
The present invention such as Fig. 3 is example 2.Excite field source around exploration targets in surface deployment 2 four or four orientation all standings, four levels excite field source A
1b
1, A
2b
2, A
3b
3, A
4b
4four field sources are end to end, level excites four of field source angle points to be set to earth point, lay four grounded electrode, four mutually orthogonal levels excite in field source around square in lay and receive survey grid, square field source length of side 4km, forms the middle three-dimensional acquisition received of square that four orientation all standings excite field source and field source to surround.
Described reception survey grid density (measuring point spacing) is 200 meters, and each measuring point lays an acquisition station, and acquisition station is 4 roads, measures 4 component electromagnetic fields, namely with the horizontal electric field component Ex exciting field source parallel with vertical, Ey, and horizontal component ofmagnetic field Hx, Hy.
Because exploration targets strike length is greater than 5km, need to lay four orientation all standings again and excite field source, excite between field source with previous four orientation all standings and want overlapping 20% area.
Described 2 four mutually orthogonal levels excite field source to be square.
Described level excites field source A
1b
1with A
2b
2share an earth point, B
1with A
2be connected on same earth point; A
2b
2with A
3b
3share an earth point, B
2with A
3be connected on same earth point; A
3b
3with A
4b
4share an earth point, B
3with A
4be connected on same earth point; A
4b
4with A
1b
1share an earth point, B
4with A
1be connected on same earth point.
Described level excites field source side ratio exploration targets length large 20%, and the length of side is 4km.
In example 2, subsurface reservoir target sizes 3x5km, lay two overlapping four orientation to cover and excite field source, (as Fig. 3), each four mutually perpendicular levels excite field source, likeness in form square, length of side 4km, four angle points are earth point, lay four grounded electrode, receive survey grid be laid in above goal in research, four excite around square in.Four levels excite field source to be respectively A
1b
1, A
2b
2, A
3b
3, A
4b
4, the long 4km of each field source, meanwhile, makes A
1b
1with A
2b
2share an earth point, B
1with A
2be connected on same earth point, equally, A
2b
2with A
3b
3share an earth point, B
2with A
3be connected on same earth point, A
3b
3with A
4b
4share an earth point, B
3with A
4be connected on same earth point, A
4b
4with A
1b
1share an earth point, B
4with A
1be connected on same earth point, four field sources are end to end, receive survey grid and are laid in goal in research overhead surface (as Fig. 3).Survey grid is 3x3km, and each measuring point lays five component acquisition stations, measures five component electromagnetic fields, namely parallel with vertical with field source AB horizontal electric field component Ex, Ey, and horizontal component ofmagnetic field Hx, Hy and vertical magnetic field Hz(are as Fig. 3).Complete after first four orientation excite and measure, by whole for cubic potential field source movement 7 measuring point positions, make two cubic potential field sources overlapping, as indicated by the dashed lines.
Claims (6)
1. a four orientation all standings three-dimensional controllable source electromagnetic data acquisition method, feature is realized by following scheme:
Field source A is excited in the level that surface deployment four is mutually orthogonal around exploration targets
1b
1, A
2b
2, A
3b
3, A
4b
4four end to end formation squares of field source or rectangle, level excites four of field source angle points to be set to earth point, lay four grounded electrode, excite in field source to lay four mutually orthogonal levels and receive survey grid, form the three-dimensional acquisition received in the middle of square or rectangle that four orientation all standings excite field source and field source to surround.
2. method according to claim 1, feature is that described exploration targets strike length is greater than 5-8km, lays two or more four orientation all standings and excites field source, and every two four orientation all standings excite between field source and want overlapping 20% area.
3. method according to claim 1, feature is described reception survey grid density is 25-200 rice, each measuring point lays an acquisition station, acquisition station is single track or 2 roads or 3 roads or 4 roads or 5 roads, measure five component electromagnetic fields or wherein certain several component, five components are and the horizontal electric field component Ex exciting field source parallel with vertical, Ey respectively, horizontal component ofmagnetic field Hx, Hy and the magnetic field Hz perpendicular to ground.
4. method according to claim 1, feature is that described four mutually orthogonal levels excite field source to surround into square or rectangle.
5. method according to claim 1, feature is that described level excites field source A
1b
1with A
2b
2share an earth point, B
1with A
2be connected on same earth point; A
2b
2with A
3b
3share an earth point, B
2with A
3be connected on same earth point; A
3b
3with A
4b
4share an earth point, B
3with A
4be connected on same earth point; A
4b
4with A
1b
1share an earth point, B
4with A
1be connected on same earth point.
6. method according to claim 1, feature is that described level excites the large 10-30% of field source side ratio exploration targets length, is 10km to the maximum.
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| CN201410139125.2A CN104977619B (en) | 2014-04-09 | 2014-04-09 | The three-dimensional controllable source electromagnetic data acquisition method of the orientation all standing of one kind four |
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| CN201410139125.2A CN104977619B (en) | 2014-04-09 | 2014-04-09 | The three-dimensional controllable source electromagnetic data acquisition method of the orientation all standing of one kind four |
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| 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 |
| CN107356976A (en) * | 2017-07-14 | 2017-11-17 | 江苏建筑职业技术学院 | A kind of portable assembly transient electromagnetic coil device |
| 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 |
| CN109884714A (en) * | 2019-03-05 | 2019-06-14 | 中国地质科学院地球物理地球化学勘查研究所 | A kind of controllable source method for electromagnetically measuring, device and its storage medium |
| CN111965718A (en) * | 2019-05-20 | 2020-11-20 | 中国石油天然气集团有限公司 | Electromagnetic data acquisition method and device based on four-direction excitation |
| CN116088060A (en) * | 2023-04-12 | 2023-05-09 | 山东大学 | Artificial source electromagnetic exploration system and method based on orthogonal field source-error frequency excitation |
| CN116088059A (en) * | 2023-04-10 | 2023-05-09 | 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 |
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Cited By (8)
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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 |
| CN107356976A (en) * | 2017-07-14 | 2017-11-17 | 江苏建筑职业技术学院 | A kind of portable assembly transient electromagnetic coil device |
| CN109884714A (en) * | 2019-03-05 | 2019-06-14 | 中国地质科学院地球物理地球化学勘查研究所 | A kind of controllable source method for electromagnetically measuring, device and its storage medium |
| CN111965718A (en) * | 2019-05-20 | 2020-11-20 | 中国石油天然气集团有限公司 | Electromagnetic data acquisition method and device based on four-direction excitation |
| 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 |
| CN116088059A (en) * | 2023-04-10 | 2023-05-09 | 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 |
| CN116088060A (en) * | 2023-04-12 | 2023-05-09 | 山东大学 | Artificial source electromagnetic exploration system and method based on orthogonal field source-error frequency excitation |
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