CN105785459B - A kind of method that across hole transient electromagnetic method directly positions anomalous body - Google Patents
A kind of method that across hole transient electromagnetic method directly positions anomalous body Download PDFInfo
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- CN105785459B CN105785459B CN201610350292.0A CN201610350292A CN105785459B CN 105785459 B CN105785459 B CN 105785459B CN 201610350292 A CN201610350292 A CN 201610350292A CN 105785459 B CN105785459 B CN 105785459B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
- G01V3/28—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device using induction coils
Abstract
The present invention relates to a kind of method that across hole transient electromagnetic method directly positions anomalous body, emitter and reception device are respectively placed in two drilling wells side by side, to position the anomalous body between two drilling wells, the contour transient electrical magnetic recording level of development transmitting, receiving position is surveyed in two drilling wells, obtain and responded with the transition secondary field induced voltage section of the differential declines time of hole depth change, and analyze and determine its extreme point；Carry out transient electromagnetic in two drilling wells tiltedly to survey, obtain and responded with the transition secondary field induced voltage section of the differential declines time of hole depth change, and analyze and determine its extreme point；The joining of transmitting-receiving line corresponding to surveying according to flat survey and tiltedly the extreme point point position determined, obtains the center of anomalous body.The inventive method can directly, it is quick, real-time, effectively utilize across hole transient electromagnetic method directly to position anomalous body, a large amount of inverting numerical computations can be avoided, and avoid the multi-solution of inverting.
Description
Technical field
The present invention relates to a kind of method that across hole transient electromagnetic method directly positions anomalous body, belongs to geophysical exploration neck
Domain, this method can be used between positioning hole such as blind orebody, tomography, splitting with respect to geologic body of the country rock with respect to electrical property difference
The geological anomalous bodies such as gap band, solution cavity, goaf, underground water.
Background technology
Transient electromagnetic method is a kind of important method in geophysical exploration method, utilizes earth-free loop line or ground wire
Source sends pulsatile once electromagnetic field to underground, in the tempus intercalare of pulsatile once electromagnetic field, is observed using coil or grounding electrode
Secondary turbulence field, the method being distributed according to the electrical parameter of the information acquisition target area medium of the secondary field.Conventional transition
Method for electromagnetically measuring have ground transient electromagnetic method ,-well transient electromagnetic method, cross beam floor.
At present, across the hole positioning of transient electromagnetic is problem, is typically positioned both at home and abroad using inversion technique, because inverting is built
Stand on forward modeling basis, transient electromagnetic multidimensional Forward technology is not perfect, inversion technique slower development；And inversion result can
There is dependence to model primary election value by property；Again because observation data number is limited in measurement process, error be present, cause anti-
Drill that result is not unique, has multi-solution.Although therefore inverting can position to anomalous body to a certain extent, due to result
Do not have uniqueness, unstable and computationally intensive, cause that positioning result is unreliable, calculating speed is slow.
The content of the invention
The problem of existing for existing location technology, it is an object of the invention to provide it is a kind of directly, it is quick, in real time, have
The method that across the hole transient electromagnetic method of effect directly positions anomalous body.
The technical scheme is that：A kind of method that across hole transient electromagnetic method directly positions anomalous body, by emitter
It is respectively placed in reception device in two drilling wells side by side, to position the anomalous body between two drilling wells, including following step
Suddenly：
1) the contour transient electrical magnetic recording level of development transmitting, receiving position is surveyed in two drilling wells, is obtained with hole depth change not
Transition secondary field induced voltage section with die-away time responds, and analyzes and determine its extreme point；
2) carry out transient electromagnetic in two drilling wells tiltedly to survey, obtain secondary with the transition of the differential declines time of hole depth change
Field induced voltage section response, and analyze and determine its extreme point；
3) joining of the transmitting-receiving line according to corresponding to the flat extreme point point position surveyed and tiltedly surveyed and determine, obtains anomalous body
Center.
2nd, the method that across hole transient electromagnetic method according to claim 1 directly positions anomalous body, it is characterised in that：
The point that step 2) is tiltedly surveyed away from S and transmitting-receiving relative relief H by the vertical range D of the flat measuring point of highest and minimum flat measuring point,
The flat vertical range Y for surveying extreme point and the flat measuring point of highest, the flat distinguishable breadth W for surveying exception are determined, are specially：
As Y≤D/2, for oblique measuring point away from S ＜ W/4, transmitting TX meets W/4 ＜ H≤W higher than RX, discrepancy in elevation H is received；Or when Y >=
During D/2, for oblique measuring point away from S ＜ W/4, transmitting TX meets W/4 ＜ H≤W less than RX, discrepancy in elevation H is received.
In a detailed embodiment, two drilling wells are straight well.
The anomalous body has the geologic body of relative electrical property difference with respect to country rock.
In a detailed embodiment, n is set respectively to shaft bottom using D/n as spacing from the flat measuring point of highest in two drilling wells
+ 1 point；Emitter and reception device are respectively placed in two corresponding points of the same horizontal position by flat survey, and carry out n+1
The flat of point measures flat survey response curve；Oblique measuring point is taken tiltedly to be surveyed to (D-H)/S+1 point away from S and transmitting-receiving relative relief H again
Obtain tiltedly surveying response curve.
Relational language is explained：
It is flat to survey：Transmitting is equal with position absolute altitude is received；
Tiltedly survey：Transmitting and reception position absolute altitude；
The flat measuring point of highest：The flat measuring point nearest apart from well head；
Minimum flat measuring point：The flat measuring point farthest apart from well head；
Extreme point：On curve a bit, the point value is all bigger than the value of the point beside it or all small；
Abnormal breadth：Abnormal section crosses over a point bit width on curve.
The inventive method can pass through the side of single-point transient electromagnetic sounding curve electric structure come qualitative analysis layered medium
Method, the qualitative analysis of vertical electrical structure can be carried out with regard to single transient electromagnetic sounding point, while being capable of real time contrast's measuring point phase
Vertical electrical structure change below reference background point.
The inventive method is different available for geology such as blind orebody, tomography, fissure zone, solution cavity, goaf, underground water between positioning hole
Chang Ti.By successively implementing flat survey in being drilled to the two of survey and tiltedly surveying, pass through flat survey and tiltedly survey the transmitting-receiving line of extreme point
Intersection point is the center for determining anomalous body.The method positioned compared to more traditional transient electromagnetic logging inversion, this method can be kept away
Exempt from a large amount of inverting numerical computations, and avoid the multi-solution of inverting, reach purpose that is real-time, quick, being accurately positioned anomalous body.
Brief description of the drawings
Fig. 1 is the experiment arrangement schematic diagram of the present invention；
Fig. 2 is that arrangement schematic diagram is tested in the flat test of embodiment 1, the inductive voltage value that measurement obtains changes with hole depth
Relation curve and flat measure position schematic diagram；
Fig. 3 is that arrangement schematic diagram is tested in the oblique test of embodiment 1, the inductive voltage value that measurement obtains changes with hole depth
Relation curve and tiltedly measure position schematic diagram；
Fig. 4 is the positioning schematic diagram of embodiment 1；
Fig. 5 is that arrangement schematic diagram is tested in the flat test of embodiment 2, the inductive voltage value that measurement obtains changes with hole depth
Relation curve and flat measure position schematic diagram；
Fig. 6 is that arrangement schematic diagram is tested in the oblique test of embodiment 2, the inductive voltage value that measurement obtains changes with hole depth
Relation curve and tiltedly measure position schematic diagram；
Fig. 7 is the positioning schematic diagram of embodiment 2；
Fig. 8 is the flat survey model schematic of embodiment 3, measures the relation curve that obtained inductive voltage value changes with hole depth
And flat measure position schematic diagram；
Fig. 9 is that arrangement schematic diagram is tested in the oblique test of embodiment 3, the inductive voltage value that measurement obtains changes with hole depth
Relation curve and tiltedly measure position schematic diagram；
Figure 10 is the positioning schematic diagram of embodiment 3.
Embodiment
Embodiment 1
The present embodiment carries out numerical computations using transient electromagnetic numerical simulation software (MAXWELL).
Design two straight wells and well depth is identical, spacing 50m, well depth D=100m, the size of well is ignored, two across well
Vertical at the 50m of centre distance ground to insert one piece of 30m*30m thin aluminum sheet (using thin plate center as calculating point), thickness is ignored.
21 points are set respectively from well head to shaft bottom using 5m as spacing in two drilling wells and numbered, numbering is respectively A1,
A2 ... ..., A21；B1, B2 ... ..., B21.Fig. 2-1 surveys model schematic to be flat.
A, transmitting coil (TX) is put into drilling well 1, is placed in A1 positions, reception device (RX) is put into drilling well 2, is placed in B1
Position, pulse current is passed through in emitter, reception device receives secondary magnetic field information, carries out the flat survey of first point.
B, emitter and reception device are moved to shaft bottom direction synchronizing moving 5m respectively and moves on to A2, B2 position, repeated
Step a carries out the flat survey of second point.
C, by that analogy, the flat survey of totally 21 points is completed.Flat response curve of surveying is shown in Fig. 2-2, determines its extreme point position in B11
Place, i.e. Y=50m, abnormal breadth W=40m, oblique measuring point is away from S<W/4 (i.e. S<10m), transmitting can may be lower than receiving higher than reception,
Discrepancy in elevation H meets W/4 ＜ H≤W (i.e. 10m<H≤40m).
D, extreme point position and abnormal breadth are surveyed according to flat, taking oblique measuring point, transmitting is higher than H=20m is received, in drilling well 1 away from S=5m
In be put into transmitting coil, be placed in A1 positions, reception device is put into drilling well 2, is placed in B5 positions, 20m differences in height is kept, is launching
Pulse current is passed through in device, reception device receives secondary magnetic field information, and the first time for carrying out first point tiltedly surveys.
E, emitter and reception device are moved to shaft bottom direction synchronizing moving 5m respectively and moves on to A2, B6 position, kept
20m differences in height, the first time that repeat step D carries out second point tiltedly survey.
F, by that analogy, the oblique survey of totally 17 points is completed, obtains tiltedly surveying response curve and sees Fig. 3-2.
G, according to the line (Fig. 2-3) of the transmitting receiving position of the extreme point position correspondence of the flat response curve surveyed, and tiltedly
The joining for launching the line (Fig. 3-3) of receiving position corresponding to the response curve extreme point measured is the center of anomalous body
Position (Fig. 4), realizes the positioning to anomalous body center in well.
Embodiment 2
The present embodiment carries out numerical computations using transient electromagnetic numerical simulation software (MAXWELL).
Two parallel and well depth identical brills are designed, spacing 50m, well depth 100m, the size of well is ignored, from brill
The horizontal range 10m of well 2, from the ground vertical range 25m vertically insert one piece of 20m*20m thin aluminum sheet (using thin plate center as calculating
Point), thickness is ignored.
21 points are set respectively from well head to shaft bottom using 5m as spacing in two drilling wells and numbered, numbering is respectively A1,
A2 ... ..., A21；B1, B2 ... ..., B21.Fig. 5 surveys model schematic to be flat.
A, transmitting coil is put into drilling well 1, is placed in A1 positions, reception device is put into drilling well 2, is placed in B1 positions,
Pulse current is passed through in emitter, reception device receives secondary magnetic field information, carries out the flat survey of first point.
B, emitter and reception device are moved to shaft bottom direction synchronizing moving 5m respectively and moves on to A2, B2 position, repeated
Step A carries out the flat survey of second point.
C, by that analogy, the flat survey of totally 21 points is completed, flat response curve of surveying is obtained and sees Fig. 5-2, determine its extreme point position
At B11, i.e. Y=25m, abnormal breadth W=30m, oblique measuring point is away from S<W/4 (i.e. S<7.5m), transmitting, which is less than, receives, and W/4 ＜ H≤
W (i.e. 7.5m<H≤30m).
D, extreme point position and abnormal breadth are surveyed according to flat, takes oblique measuring point being bored away from S=5m, transmitting less than H=30m is received
Transmitting coil is put into well 1, is placed in A1 positions, reception device is put into drilling well 2, is placed in B7 positions, keeps 30m differences in height,
Pulse current is passed through in emitter, reception device receives secondary magnetic field information, carries out the oblique survey of first point.
E, emitter and reception device are moved to shaft bottom direction synchronizing moving 5m respectively and moves on to A2, B8 position, kept
30m differences in height, repeat step D carry out the oblique survey of second point.
F, by that analogy, the oblique survey of totally 17 points is completed, obtains tiltedly surveying response curve and sees Fig. 6-2.
G, according to the line (Fig. 6-3) of the transmitting receiving position of the extreme point position correspondence of the flat response curve surveyed, and tiltedly
The joining for launching the line (Fig. 6-3) of receiving position corresponding to the response curve extreme point measured is the center of anomalous body
Position (Fig. 7), realizes the positioning to anomalous body center in well.
Embodiment 3
The present embodiment is physical simulation experiment.In country rock, the 10cm length of sides thin aluminium block generation, are represented using tank water storage in experiment
Table is 50cm to surveying two pitchs of holes, hole depth 45cm, well size is ignored, from the horizontal range of hole 2 with respect to post non of low resistance body
25cm, from the ground vertical range 25m vertically insert one piece of 10m*10m thin aluminum sheet (using thin plate center as reference point), and thickness is ignored
Disregard.
19 points are set respectively from aperture to bottom hole using 2.5cm as spacing in two drilling wells and numbered, numbering is respectively A1,
A2 ... ..., A19；B1, B2 ... ..., B19.Fig. 8-1 surveys model schematic to be flat.
A, transmitting coil is put into drilling well 1, is placed in A1 positions, reception device is put into drilling well 2, is placed in B1 positions,
Pulse current is passed through in emitter, reception device receives secondary magnetic field information, carries out the flat survey of first point.
B, emitter and reception device are moved to shaft bottom direction synchronizing moving 2.5cm respectively and moves on to A2, B2 position, weight
Multiple step A carries out the flat survey of second point.
C, by that analogy, the flat survey of totally 21 points is completed, flat response curve of surveying is obtained and sees Fig. 8-2, determine its extreme point position
At B11, i.e. Y=25cm, abnormal breadth W=20cm, oblique measuring point is away from S<W/4 (i.e. S<5cm), transmitting is less than reception, W/4 ＜ H
≤ W (i.e. 5cm<H≤30m).
D, extreme point position and abnormal breadth to be surveyed according to flat, takes oblique measuring point away from S=2.5cm, transmitting, which is less than, receives H=10cm,
Transmitting coil is put into drilling well 1, is placed in A1 positions, reception device is put into drilling well 2, is placed in B7 positions, keeps 10cm height
Difference, pulse current is passed through in emitter, reception device receives secondary magnetic field information, carries out the oblique survey of first point.
E, emitter and reception device are moved to shaft bottom direction synchronizing moving 2.5cm respectively and moves on to A2, B8 position, protected
10cm differences in height are held, repeat step D carries out the oblique survey of second point.
F, by that analogy, the oblique survey of totally 15 points is completed, obtains tiltedly surveying response curve and sees Fig. 9-2.
G, according to the line (Fig. 8-3) of the transmitting receiving position of the extreme point position correspondence of the flat response curve surveyed, and tiltedly
The joining for launching the line (Fig. 9-3) of receiving position corresponding to the response curve extreme point measured is the center of anomalous body
Position (Figure 10), realizes the positioning to aluminium block center in tank.
The specific embodiment of the present invention is above are only, it will be apparent to those skilled in the art that the present invention also has others real
Mode is applied, it is all to make any modification, or equivalent substitution etc. within the inventive concept of the present invention, all should be in the protection of the present invention
Within the scope of.
Claims (5)
1. a kind of method that across hole transient electromagnetic method directly positions anomalous body, it is characterised in that：
Emitter and reception device are respectively placed in two drilling wells side by side, to position the exception between two drilling wells
Body, comprise the following steps：
1）The contour transient electrical magnetic recording level of development transmitting, receiving position is surveyed in two drilling wells, is obtained and is declined with the difference of hole depth change
Subtract the transition secondary field induced voltage section response of time, and analyze and determine its extreme point；
2）Carry out transient electromagnetic in two drilling wells tiltedly to survey, obtain the transition secondary field sense of the differential declines time with hole depth change
Answer voltage section to respond, and analyze and determine its extreme point；
3）The joining of transmitting-receiving line corresponding to surveying according to flat survey and tiltedly the extreme point point position determined, obtains the center of anomalous body
Position.
2. the method that across hole transient electromagnetic method according to claim 1 directly positions anomalous body, it is characterised in that：
Step 2）The point tiltedly surveyed is away from S and transmitting-receiving relative relief H by the vertical range D of the flat measuring point of highest and minimum flat measuring point, flat survey
The vertical range Y of extreme point and the flat measuring point of highest, the flat distinguishable breadth W for surveying exception are determined, are specially：
As Y ＜ D/2, for oblique measuring point away from S ＜ W/4, transmitting TX meets W/4 ＜ H≤W higher than RX, discrepancy in elevation H is received；Or as Y >=D/2
When, for oblique measuring point away from S ＜ W/4, transmitting TX meets W/4 ＜ H≤W less than RX, discrepancy in elevation H is received.
3. the method that across hole transient electromagnetic method according to claim 2 directly positions anomalous body, it is characterised in that：Two brills
Well is straight well.
4. the method that across hole transient electromagnetic method according to claim 1 or 2 directly positions anomalous body, it is characterised in that：Institute
Stating anomalous body has the geologic body of relative electrical property difference with respect to country rock.
5. the method that across hole transient electromagnetic method according to claim 3 directly positions anomalous body, it is characterised in that：Two brills
N+1 point is set respectively from the flat measuring point of highest to shaft bottom by spacing of D/n in well；It is flat to survey emitter and reception device point i.e.
It is not placed in two corresponding points of the same horizontal position, carries out n+1 the flat of point and measure flat survey response curve；Oblique measuring point is taken again
Away from S and H pairs of relative relief of transmitting-receiving（D-H）/ S+1 point, which tiltedly measure, tiltedly surveys response curve.
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| US6636046B2 (en) * | 2001-10-15 | 2003-10-21 | The Regents Of The University Of California | Electrical resistivity probes |
| US7565244B2 (en) * | 2007-06-27 | 2009-07-21 | Schlumberger Technology Corporation | Method and system for removing effects of conductive casings and wellbore and surface heterogeneity in electromagnetic imaging surveys |
| CN102419455B (en) * | 2011-08-23 | 2013-08-14 | 安徽理工大学 | Interwell parallel resistivity CT (computed tomography) testing method |
| CN105044787B (en) * | 2011-12-08 | 2017-12-26 | 沙特阿拉伯石油公司 | Super-resolution formation fluid is imaged |
| CN102759751B (en) * | 2012-07-30 | 2015-04-22 | 山东大学 | High-resolution three-dimensional resistivity CT imaging advanced prediction system and method for underground engineering |
| CN102966349A (en) * | 2012-11-28 | 2013-03-13 | 褚万泉 | System and method for monitoring cross-hole electromagnetic transient |
| CN204613417U (en) * | 2015-04-13 | 2015-09-02 | 辽宁省水利水电科学研究院 | Across perspective detection stratum, hole High water cut zone device |
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