CN105785459A - Method for directly locating abnormal part through cross-hole transient electromagnetic method - Google Patents
Method for directly locating abnormal part through cross-hole transient electromagnetic method Download PDFInfo
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- CN105785459A CN105785459A CN201610350292.0A CN201610350292A CN105785459A CN 105785459 A CN105785459 A CN 105785459A CN 201610350292 A CN201610350292 A CN 201610350292A CN 105785459 A CN105785459 A CN 105785459A
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- 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
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Abstract
The invention relates to a method for directly locating an abnormal part through a cross-hole transient electromagnetic method. The method comprises the following steps: respectively arranging an emitting device and a receiving device in two drilling wells arranged in parallel so as to be used for locating the abnormal part located between the two drilling wells; performing equal-altitude transient electromagnetic flat measurement for the emitting and receiving positions in the two drilling wells, acquiring transient secondary field induced voltage profile response at different damping times following the change of hole depth, and analyzing and confirming an extreme point; performing transient electromagnetic inclined measurement in the two drilling wells, acquiring transient secondary field induced voltage profile response at different damping times following the change of hole depth, and analyzing and confirming the extreme point; and acquiring the central position of the abnormal part according to the cross point of the receiving and dispatching connecting wire corresponding to the extreme points confirmed through flat measurement and inclined measurement. According to the method provided by the invention, the cross-hole transient electromagnetic method can be directly, quickly and efficiently utilized to directly locate the abnormal part in real time, mass inversion numerical calculation can be avoided, and the multiplicity of solution of inversion can be avoided.
Description
Technical field
The present invention relates to a kind of method directly positioning anomalous body across hole transient electromagnetic method, belong to field of geophysical exploration, the method can be used for positioning relative country rock between hole and has the geologic body of electrical property difference relatively, such as geological anomalous body such as blind orebody, tomography, fissure zone, solution cavity, goaf, subsoil water.
Background technology
Transient electromagnetic method is a kind of important method in geophysical exploration method, earth-free loop line or ground connection line source is utilized to send pulsatile once electromagnetic field to underground, tempus intercalare at pulsatile once electromagnetic field, utilize coil or ground electrode observation secondary turbulence field, according to the method that the electrical parameter of the information acquisition target area medium of this secondary field is distributed.Conventional Transient electromagnetic measure method have ground transient electromagnetic method ,-well transient electromagnetic method, cross beam floor.
At present, transient electromagnetic is a difficult problem across location, hole, is generally adopted inversion technique both at home and abroad and positions, just drills on basis owing to inverting builds on, and transient electromagnetic multidimensional Forward technology is not perfect, inversion technique slower development；And model primary election value is had dependency by the reliability of inversion result；Owing to observing in measurement process, data number is limited, there is error again, causes that inversion result is unique, has multi-solution.Although therefore anomalous body can be positioned by inverting to a certain extent, but do not have uniqueness, instability due to result, and computationally intensive, cause that positioning result is unreliable, it is slow to calculate speed.
Summary of the invention
For existing location technology Problems existing, it is an object of the invention to provide a kind of method directly, fast, in real time, effectively directly positioning anomalous body across hole transient electromagnetic method.
The technical scheme is that a kind of method directly positioning anomalous body across hole transient electromagnetic method, discharger and reception device be respectively placed in two drilling wells side by side, to position the anomalous body between two drilling wells, comprise the following steps:
1) in two drilling wells, carry out transmitting, receive the contour transient electrical magnetic recording level in position and survey, it is thus achieved that with the transition secondary field induced voltage section response of the differential declines time of hole depth change, and analyze and determine its extreme point；
2) in two drilling wells, carry out transient electromagnetic tiltedly to survey, it is thus achieved that with the transition secondary field induced voltage section response of the differential declines time of hole depth change, and its extreme point is determined in analysis；
3) joining according to the flat transmitting-receiving line surveyed and tiltedly survey corresponding to the extreme point point position determined, obtains the center of anomalous body.
2, the method directly positioning anomalous body across hole transient electromagnetic method according to claim 1, it is characterised in that:
Step 2) point tiltedly surveyed from S and transmitting-receiving relative relief H by the vertical dimension D of the highest flat measuring point and minimum flat measuring point, flat survey the vertical dimension Y of extreme point and the highest flat measuring point, flat survey abnormal distinguishable fabric width W and determine, particularly as follows:
As Y≤D/2, oblique measuring point, from S < W/4, is launched TX higher than receiving RX, discrepancy in elevation H and is met W/4 < H≤W；Or as Y >=D/2, oblique measuring point, from S < W/4, is launched TX lower than receiving RX, discrepancy in elevation H and is met W/4 < H≤W.
In a detailed description of the invention, two drilling wells are straight well.
Described anomalous body has the geologic body of relative electrical property difference relative to country rock.
In a detailed description of the invention, two drilling wells to shaft bottom are respectively provided with n+1 point for spacing by the highest flat measuring point with D/n；Flat survey is respectively placed in two corresponding point of same level position with receiving device by discharger, carries out the flat of n+1 point and records flat survey response curve；Take oblique measuring point again from S and transmitting-receiving relative relief H, (D-H)/S+1 point tiltedly to be recorded and tiltedly survey response curve.
Relational language is explained:
Flat survey: launch and reception position absolute altitude is equal；
Tiltedly survey: launch and do not receive position absolute altitude not etc.；
The highest flat measuring point: the flat measuring point that distance well head is nearest；
Minimum flat measuring point: the flat measuring point that distance well head is farthest；
Extreme point:, this point value is all bigger than the value of the point on its side or all little on curve a bit；
Abnormal fabric width: abnormal section crossover point bit width on curve.
The method that the inventive method can carry out qualitative analysis layered medium ground electricity structure by single-point transient electromagnetic sounding curve, the qualitative analysis of vertical electrical structure can be carried out with regard to single transient electromagnetic sounding point, can change relative to the vertical electrical structure below reference background point by real time contrast's measuring point simultaneously.
The inventive method can be used for positioning the geological anomalous body such as blind orebody between hole, tomography, fissure zone, solution cavity, goaf, subsoil water.Survey by successively implementing to put down in holing to two surveyed and tiltedly survey, namely determined the center of anomalous body by the transmitting-receiving line intersection point of flat survey with tiltedly survey extreme point.The method of the transient electromagnetic logging inversion location comparing traditional, this method can avoid a large amount of inverting numerical computations, and avoids the multi-solution of inverting, reaches real-time, quick, to be accurately positioned anomalous body purpose.
Accompanying drawing explanation
Fig. 1 is the test arrangement schematic diagram of the present invention；
Fig. 2 be the flat test of embodiment 1 test arrangement schematic diagram, the relation curve measuring the inductive voltage value that obtains and change with hole depth and flat mensuration position schematic diagram；
Fig. 3 be the tiltedly test of embodiment 1 test arrangement schematic diagram, the relation curve measuring the inductive voltage value that obtains and change with hole depth and oblique mensuration position schematic diagram；
Fig. 4 is the location schematic diagram of embodiment 1；
Fig. 5 be the flat test of embodiment 2 test arrangement schematic diagram, the relation curve measuring the inductive voltage value that obtains and change with hole depth and flat mensuration position schematic diagram；
Fig. 6 be the tiltedly test of embodiment 2 test arrangement schematic diagram, the relation curve measuring the inductive voltage value that obtains and change with hole depth and oblique mensuration position schematic diagram；
Fig. 7 is the location schematic diagram of embodiment 2；
Fig. 8 is the flat survey model schematic of embodiment 3, measures relation curve and flat mensuration position schematic diagram that the inductive voltage value that obtains change with hole depth；
Fig. 9 be the tiltedly test of embodiment 3 test arrangement schematic diagram, the relation curve measuring the inductive voltage value that obtains and change with hole depth and oblique mensuration position schematic diagram；
Figure 10 is the location schematic diagram of embodiment 3.
Detailed description of the invention
Embodiment 1
The present embodiment adopts transient electromagnetic numerical simulation software (MAXWELL) to carry out numerical computations.
Designing two straight wells and well depth is identical, spacing is 50m, well depth D=100m, and the size of well is ignored, and vertically inserts one piece of 30m*30m thin aluminum sheet (with thin plate center for calculating point) two across 50m place, well centre distance ground, and thickness is ignored.
Two drilling wells it is respectively provided with 21 points with 5m for spacing by well head to shaft bottom and numbers, numbering respectively A1, A2 ..., A21；B1, B2 ..., B21.Fig. 2-1 surveys model schematic for flat.
A, drilling well 1 is put into transmitting coil (TX), it is placed in A1 position, drilling well 2 is put into reception device (RX), is placed in B1 position, discharger passes into pulse current, receives device and receive secondary magnetic field information, carry out the flat survey of first point.
B, by discharger with receive device and move to direction, shaft bottom synchronizing moving 5m respectively and move on to A2, B2 position, repeat step a and carry out the flat survey of second point.
C, by that analogy, completes the flat survey of totally 21 points.Flat response curve of surveying is shown in Fig. 2-2, it is determined that its extreme point position at B11 place, i.e. Y=50m, abnormal fabric width W=40m, oblique measuring point is from S < W/4 (i.e. S < 10m), and transmitting can be higher than reception and may be lower than receiving, and discrepancy in elevation H meets W/4 < H≤W (i.e. 10m < H≤40m).
D, evidence are flat surveys extreme point position and abnormal fabric width, take oblique measuring point from S=5m, launch higher than receiving H=20m, drilling well 1 is put into transmitting coil, is placed in A1 position, drilling well 2 is put into reception device, is placed in B5 position, keep 20m difference in height, discharger passes into pulse current, receiving device and receive secondary magnetic field information, the first time carrying out first point tiltedly surveys.
E, by discharger with receive device and move to direction, shaft bottom synchronizing moving 5m respectively and move on to A2, B6 position, keep 20m difference in height, repeat step D and carry out first time of second point and tiltedly survey.
F, by that analogy, completes the oblique survey of totally 17 points, obtains tiltedly surveying response curve and sees Fig. 3-2.
G, according to the extreme point position of the flat response curve surveyed corresponding launch the line (Fig. 2-3) receiving position, the joining launching the line (Fig. 3-3) receiving position corresponding to the response curve extreme point tiltedly recorded is the center (Fig. 4) of anomalous body, it is achieved that to the location at anomalous body center in well.
Embodiment 2
The present embodiment adopts transient electromagnetic numerical simulation software (MAXWELL) to carry out numerical computations.
Design two parallel and brills that well depth is identical, spacing is 50m, and well depth is 100m, and the size of well is ignored, vertically inserting one piece of 20m*20m thin aluminum sheet (with thin plate center for calculating point) from drilling well 2 horizontal range 10m, overhead vertical dimension 25m, thickness is ignored.
Two drilling wells it is respectively provided with 21 points with 5m for spacing by well head to shaft bottom and numbers, numbering respectively A1, A2 ..., A21；B1, B2 ..., B21.Fig. 5 surveys model schematic for flat.
A, drilling well 1 is put into transmitting coil, it is placed in A1 position, drilling well 2 is put into reception device, is placed in B1 position, discharger passes into pulse current, receive device and receive secondary magnetic field information, carry out the flat survey of first point.
B, by discharger with receive device and move to direction, shaft bottom synchronizing moving 5m respectively and move on to A2, B2 position, repeat step A and carry out the flat survey of second point.
C, by that analogy, complete the flat survey of totally 21 points, obtain flat response curve of surveying and see Fig. 5-2, determine that its extreme point position is at B11 place, i.e. Y=25m, abnormal fabric width W=30m, oblique measuring point is from S < W/4 (i.e. S < 7.5m), launch lower than reception, W/4 < H≤W (i.e. 7.5m < H≤30m).
D, basis are flat surveys extreme point position and abnormal fabric width, take oblique measuring point from S=5m, launch lower than receiving H=30m, drilling well 1 is put into transmitting coil, is placed in A1 position, drilling well 2 is put into reception device, is placed in B7 position, keep 30m difference in height, discharger passes into pulse current, receive device and receive secondary magnetic field information, carry out the oblique survey of first point.
E, by discharger with receive device and move to direction, shaft bottom synchronizing moving 5m respectively and move on to A2, B8 position, keep 30m difference in height, repeat step D and carry out the oblique survey of second point.
F, by that analogy, completes the oblique survey of totally 17 points, obtains tiltedly surveying response curve and sees Fig. 6-2.
G, according to the extreme point position of the flat response curve surveyed corresponding launch the line (Fig. 6-3) receiving position, the joining launching the line (Fig. 6-3) receiving position corresponding to the response curve extreme point tiltedly recorded is the center (Fig. 7) of anomalous body, it is achieved that to the location at anomalous body center in well.
Embodiment 3
The present embodiment is physical simulation experiment.Test adopt tank water-retention represent country rock, the thin aluminium block of the 10cm length of side represents relatively low resistance body, it is 50cm to surveying two pitchs of holes, hole depth is 45cm, well size is ignored, vertically inserting one piece of 10m*10m thin aluminum sheet (with thin plate center for reference point) from hole 2 horizontal range 25cm, overhead vertical dimension 25m, thickness is ignored.
In two drilling wells with 2.5cm for spacing by aperture to being respectively provided with 19 points at the bottom of hole and numbering, number respectively A1, A2 ..., A19；B1, B2 ..., B19.Fig. 8-1 surveys model schematic for flat.
A, drilling well 1 is put into transmitting coil, it is placed in A1 position, drilling well 2 is put into reception device, is placed in B1 position, discharger passes into pulse current, receive device and receive secondary magnetic field information, carry out the flat survey of first point.
B, by discharger with receive device and move to direction, shaft bottom synchronizing moving 2.5cm respectively and move on to A2, B2 position, repeat step A and carry out the flat survey of second point.
C, by that analogy, complete the flat survey of totally 21 points, obtain flat response curve of surveying and see Fig. 8-2, determine that its extreme point position is at B11 place, i.e. Y=25cm, abnormal fabric width W=20cm, oblique measuring point is from S < W/4 (i.e. S < 5cm), launch lower than reception, W/4 < H≤W (i.e. 5cm < H≤30m).
D, basis are flat surveys extreme point position and abnormal fabric width, take oblique measuring point from S=2.5cm, launch lower than receiving H=10cm, drilling well 1 is put into transmitting coil, is placed in A1 position, drilling well 2 is put into reception device, is placed in B7 position, keep 10cm difference in height, discharger passes into pulse current, receive device and receive secondary magnetic field information, carry out the oblique survey of first point.
E, by discharger with receive device and move to direction, shaft bottom synchronizing moving 2.5cm respectively and move on to A2, B8 position, keep 10cm difference in height, repeat step D and carry out the oblique survey of second point.
F, by that analogy, completes the oblique survey of totally 15 points, obtains tiltedly surveying response curve and sees Fig. 9-2.
G, according to the extreme point position of the flat response curve surveyed corresponding launch the line (Fig. 8-3) receiving position, the joining launching the line (Fig. 9-3) receiving position corresponding to the response curve extreme point tiltedly recorded is the center (Figure 10) of anomalous body, it is achieved that to the location at aluminium block center in tank.
Above are only specific embodiments of the invention, it will be apparent to those skilled in the art that the present invention also has other embodiment, all within the inventive concept of the present invention, make any amendment, or equivalent replacement etc., all should within protection scope of the present invention.
Claims (5)
1. the method directly positioning anomalous body across hole transient electromagnetic method, it is characterised in that:
Discharger and reception device are respectively placed in two drilling wells side by side, to position the anomalous body between two drilling wells, comprise the following steps:
1) in two drilling wells, carry out transmitting, receive the contour transient electrical magnetic recording level in position and survey, it is thus achieved that with the transition secondary field induced voltage section response of the differential declines time of hole depth change, and analyze and determine its extreme point；
2) in two drilling wells, carry out transient electromagnetic tiltedly to survey, it is thus achieved that with the transition secondary field induced voltage section response of the differential declines time of hole depth change, and its extreme point is determined in analysis；
3) joining according to the flat transmitting-receiving line surveyed and tiltedly survey corresponding to the extreme point point position determined, obtains the center of anomalous body.
2. the method directly positioning anomalous body across hole transient electromagnetic method according to claim 1, it is characterised in that:
Step 2) point tiltedly surveyed from S and transmitting-receiving relative relief H by the vertical dimension D of the highest flat measuring point and minimum flat measuring point, flat survey the vertical dimension Y of extreme point and the highest flat measuring point, flat survey abnormal distinguishable fabric width W and determine, particularly as follows:
As Y≤D/2, oblique measuring point, from S < W/4, is launched TX higher than receiving RX, discrepancy in elevation H and is met W/4 < H≤W；Or as Y >=D/2, oblique measuring point, from S < W/4, is launched TX lower than receiving RX, discrepancy in elevation H and is met W/4 < H≤W.
3. the method directly positioning anomalous body across hole transient electromagnetic method according to claim 2, it is characterised in that: two drilling wells are straight well.
4. the method directly positioning anomalous body across hole transient electromagnetic method according to claim 1 and 2, it is characterised in that: described anomalous body has the geologic body of relative electrical property difference relative to country rock.
5. the method directly positioning anomalous body across hole transient electromagnetic method according to claim 3, it is characterised in that: two drilling wells to shaft bottom are respectively provided with n+1 point for spacing by the highest flat measuring point with D/n；Flat survey is respectively placed in two corresponding point of same level position with receiving device by discharger, carries out the flat of n+1 point and records flat survey response curve；Take oblique measuring point again from S and transmitting-receiving relative relief H, (D-H)/S+1 point tiltedly to be recorded and tiltedly survey response curve.
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Cited By (1)
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| CN114185100A (en) * | 2021-12-10 | 2022-03-15 | 湖南五维地质科技有限公司 | Method for extracting fine target body from transient electromagnetic data |
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