CN110320277A - Ground stress field state testing method - Google Patents
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- 238000012360 testing method Methods 0.000 title claims abstract description 39
- 238000010998 test method Methods 0.000 claims abstract description 28
- 239000011435 rock Substances 0.000 claims description 104
- 238000011065 in-situ storage Methods 0.000 claims description 45
- 230000000644 propagated effect Effects 0.000 claims description 26
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- 239000007789 gas Substances 0.000 description 7
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
- G01N29/075—Analysing solids by measuring propagation velocity or propagation time of acoustic waves by measuring or comparing phase angle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
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- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/012—Phase angle
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N2291/0232—Glass, ceramics, concrete or stone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0421—Longitudinal waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
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Abstract
The invention discloses a method for testing the state of a ground stress field, and belongs to the technical field of oil-gas exploration. The test method comprises the following steps: determining the direction of the horizontal minimum principal stress and the direction of the horizontal maximum principal stress of the full-diameter core; drilling a first core from the side surface of the full-diameter core inwards along the direction of the horizontal minimum main stress, and drilling a second core along the direction of the horizontal maximum main stress; and determining an angle theta of the radius corresponding to the maximum value of the propagation speed when the longitudinal wave propagates along the second core along different radii in the second core, rotating relative to the vertical 0-degree marking line along the clockwise direction, and an angle gamma of the radius corresponding to the maximum value of the propagation speed when the longitudinal wave propagates along the first core along different radii in the first core, rotating relative to the vertical 0-degree marking line along the clockwise direction, and determining the ground stress field state of the target area according to the angle theta and the angle gamma. The method has the advantages of simple test process, low test cost, high test speed and high accuracy.
Description
Technical field
The present invention relates to oil-gas exploration technical field, in particular to a kind of In-situ stress state test method.
Background technique
The occurrence and development of oil-gas bearing basin construction develop be certain In-situ stress state (horizontal minimum principal stress,
Size relation between horizontal maximum principal stress and vertical principal stress) effect under product.Only clear oil-gas bearing basin, oil-containing
The In-situ stress state of gas block could correctly recognize the generation and history of evolution of paleostructure person's movements and expression, could effectively analyze and
Solve the relevant issues of oil-gas exploration and development.Meanwhile when hydraulic fracturing design, In-situ stress state is determining fracture pattern and side
Position important evidence.Accordingly, it is determined that the state of stress field is of great significance to oil-gas exploration and development.
In the related technology, determine that the method for In-situ stress state mainly by acquiring core sample from target area, is led to
The numerical value that core analysis method calculates horizontal minimum principal stress, horizontal maximum principal stress and vertical principal stress is crossed, further according to numerical value
Compare the relationship of three, so that it is determined that the In-situ stress state of target area.
However, coming above by the numerical value for calculating horizontal minimum principal stress, horizontal maximum principal stress and vertical principal stress true
The method process for determining In-situ stress state is complicated, and heavy workload is at high cost.
Summary of the invention
The embodiment of the present invention provides a kind of In-situ stress state test method, for solving stress field shape in the related technology
State test process is complicated, heavy workload, problem at high cost.
Specifically, including technical solution below:
The embodiment of the present invention provides a kind of In-situ stress state test method, and the test method includes:
Step a obtains the full-hole core of target area；
Step b determines the direction of the horizontal minimum principal stress of the full-hole core and the side of horizontal maximum principal stress
To；
Step c inwardly drills through the first rock along the horizontal minimum principal stress direction from the side surface of the full-hole core
The heart drills through the second rock core along the horizontal biggest principal stress direction；
Step d determines spread speed when longitudinal wave is propagated in second rock core along the second rock core different radii
The angle, θ that the corresponding radius of maximum value turns on along clockwise direction relative to vertical 0 ° of mark line, if θ less than 45 °,
The In-situ stress state of the target area are as follows: the horizontal horizontal vertical principal stress of minimum principal stress > of maximum principal stress >；
If θ is greater than 45 °, it is determined that longitudinal wave passes when propagating in first rock core along the first rock core different radii
The angle γ that the corresponding radius of maximum value of speed turns on along clockwise direction relative to vertical 0 ° of mark line is broadcast, if γ
Less than 45 °, the In-situ stress state of the target area are as follows: the horizontal horizontal minimum master of the vertical principal stress > of maximum principal stress > answers
Power；If γ is greater than 45 °, the In-situ stress state of the target area are as follows: the vertical horizontal maximum principal stress > water of principal stress >
Flat minimum principal stress；
Vertical 0 ° of mark line is the upper end in first rock core and second rock core with the full-hole core
Identity distance is from nearest radius.
In a possible design, the step b includes:
Determine that spread speed is most when longitudinal wave is propagated in the full-hole core along the full-hole core different radii
It is worth corresponding second radius of minimum value of corresponding first radius and spread speed, the straight line side where first radius greatly
To the direction of the as described horizontal minimum principal stress, the rectilinear direction where second radius is that the horizontal maximum master answers
The direction of power.
In another possible design, the determining longitudinal wave in the full-hole core along the full-hole core not
Corresponding first radius of maximum value of spread speed and minimum value corresponding second radius of spread speed when being propagated with radius,
Include:
Angle bisecting line is drawn with the first predetermined angle in the upper surface of the full-hole core, and with any one angle
Bisector marks the angle of every angle bisecting line as 0 ° of mark line of level along clockwise direction；
Using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured；
Obtain in the full-hole core, longitudinal wave propagation speed with angle change first function；
The maximum value and minimum value and the first function that the first function is sought within the scope of 0 °~180 ° are most
It is worth the corresponding angle beta of corresponding angle [alpha], minimum value greatly.
In another possible design, first predetermined angle is 10 °, and the first function is SIN function.
In another possible design, in the step d, the determining longitudinal wave is in second rock core along described
The corresponding radius of maximum value of spread speed is marked on along clockwise direction relative to vertical 0 ° when two rock core different radiis are propagated
The angle, θ that note line turns over, comprising:
Using in second rock core with the upper surface of the full-hole core apart from nearest radius as described 0 ° vertical
Mark line is drawn angle bisecting line on the end face of second rock core with the second predetermined angle and is marked along clockwise direction
The angle of every angle bisecting line；
Using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured；
Obtain in second rock core, longitudinal wave propagation speed with angle change second function；
The maximum value of maximum value and the second function that the second function is sought within the scope of 0 °~180 ° is corresponding
Angle, θ.
In another possible design, second predetermined angle is 10 °, and the second function is SIN function.
In another possible design, in the step d, the determining longitudinal wave is in first rock core along described
The corresponding radius of maximum value of spread speed is marked on along clockwise direction relative to vertical 0 ° when one rock core different radii is propagated
The angle γ that note line turns over, comprising:
Using in first rock core with the upper surface of the full-hole core apart from nearest radius as described 0 ° vertical
Mark line is drawn angle bisecting line on the end face of first rock core with third predetermined angle and is marked along clockwise direction
The angle of every angle bisecting line；
Using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured；
Obtain in first rock core, longitudinal wave propagation speed with angle change third function；
The maximum value of maximum value and the third function that the third function is sought within the scope of 0 °~180 ° is corresponding
Angle γ.
In another possible design, the third predetermined angle is 10 °, and the third function is SIN function.
In another possible design, the diameter of first rock core and second rock core is 50.8 millimeters.
Technical solution provided in an embodiment of the present invention the utility model has the advantages that
Test method provided in an embodiment of the present invention carries out In-situ stress state according to core three-dimensional anisotropic character
Qualitative test, in the specific value for not needing to calculate horizontal minimum principal stress, horizontal maximum principal stress and vertical principal stress
Under the premise of, that is, it can determine the size relation between three, simplify In-situ stress state test process, reduce testing cost, mention
High test speed, test accuracy are high.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described.
Fig. 1 is a kind of flow chart of In-situ stress state test method provided in an embodiment of the present invention；
Fig. 2 is the flow chart of another In-situ stress state test method provided in an embodiment of the present invention；
Fig. 3 is to drill through rock core and related angle division signal along horizontal biggest principal stress direction in an exemplary embodiment
Figure；
Fig. 4 is to drill through rock core and related angle division signal along horizontal minimum principal stress direction in an exemplary embodiment
Figure；
Fig. 5 is Experimental on acoustic emission boring sample schematic diagram.
Appended drawing reference respectively indicates in figure:
1- full-hole core；
The second rock core of 2-；
The first rock core of 3-.
Specific embodiment
To keep technical solution of the present invention and advantage clearer, below in conjunction with attached drawing to embodiment of the present invention make into
One step it is described in detail.Unless otherwise defined, all technical terms used in the embodiment of the present invention all have and art technology
The normally understood identical meaning of personnel.
In the embodiment of the present invention, In-situ stress state refers to horizontal minimum principal stress, horizontal maximum principal stress and vertical master
Size relation between stress.
It is a kind of flow chart of stress field test method provided in an embodiment of the present invention referring to Fig. 1, as shown in Figure 1,
The test method includes:
Step 101, the full-hole core of target area is obtained.
Step 102, the direction of the horizontal minimum principal stress of full-hole core and the direction of horizontal maximum principal stress are determined.
Step 103, the first rock core inwardly is drilled through along horizontal minimum principal stress direction from the side surface of full-hole core, along water
Flat biggest principal stress direction drills through the second rock core.
Step 104, the maximum value of spread speed when longitudinal wave is propagated in the second rock core along the second rock core different radii is determined
The angle, θ that corresponding radius turns on along clockwise direction relative to vertical 0 ° of mark line, if θ less than 45 °, target area
The In-situ stress state in domain are as follows: the horizontal horizontal vertical principal stress of minimum principal stress > of maximum principal stress >；
If θ is greater than 45 °, it is determined that spread speed when longitudinal wave is propagated in the first rock core along the first rock core different radii
The angle γ that the corresponding radius of maximum value turns on along clockwise direction relative to vertical 0 ° of mark line, if γ less than 45 °,
The In-situ stress state of target area are as follows: the horizontal vertical horizontal minimum principal stress of principal stress > of maximum principal stress >；If γ is big
In 45 °, the In-situ stress state of target area are as follows: the vertical horizontal horizontal minimum principal stress of maximum principal stress > of principal stress >；
Vertical 0 ° of mark line is with the upper surface of full-hole core in the first rock core and the second rock core apart from nearest radius.
The principle of In-situ stress state test method provided in an embodiment of the present invention is, it is first determined full-hole core
Horizontal minimum principal stress (σHmin) direction and horizontal maximum principal stress (σHmax) direction, later again respectively along it is horizontal most
Minor principal stress (σHmin) direction direction and horizontal maximum principal stress (σHmax) direction drilled through from full-hole core the first rock core and
Second rock core, later, it is first determined the maximum of spread speed when longitudinal wave is propagated in the second rock core along the second rock core different radii
It is worth the angle, θ that corresponding radius turns on along clockwise direction relative to vertical 0 ° of mark line, ideally, live straight well
Coring is the presence of inclination angle mostly without inclination, vertical stress direction, that is, vertical 0 ° of direction, but actual conditions, therefore vertical stress direction
Opposite rock core vertical direction can deflect, which illustrates that vertical stress is relatively small less than 45 ° if θ is less than 45 °
Stress, vertical principal stress (σν) it is less than horizontal minimum principal stress (σHmin), the In-situ stress state of target area at this time are as follows: σHmax>
σHmin>σν。
If θ is greater than 45 °, illustrate that horizontal stress is relatively small stress, then vertical principal stress is greater than horizontal minimum master and answers
Power (σν>σHmin), it also needs to continue to judge the relationship between vertical principal stress and horizontal maximum principal stress, that is, determines longitudinal wave first
The corresponding radius of maximum value of spread speed is upper along clockwise direction opposite when propagating in rock core along the first rock core different radii
In the angle γ that vertical 0 ° of mark line turns over, if γ, less than 45 °, vertical principal stress is less than horizontal maximum principal stress (σν<
σHmax), the In-situ stress state of target area at this time are as follows: σHmax>σν>σHmin；If γ is greater than 45 °, vertical principal stress is greater than
Horizontal maximum principal stress (σν> σHmax), the In-situ stress state of target area at this time are as follows: σν>σHmax>σHmin。
To sum up, test method provided in an embodiment of the present invention is according to core three-dimensional anisotropic character, to stress field shape
State carries out qualitative test, is not needing to calculate the specific of horizontal minimum principal stress, horizontal maximum principal stress and vertical principal stress
Under the premise of numerical value, that is, can determine the size relation between three, simplify In-situ stress state test process, reduce test at
This, improves test speed, and test accuracy is high.
It referring to fig. 2, is the flow chart of another stress field test method provided in an embodiment of the present invention, such as Fig. 2 institute
Show, which includes:
Step 201, the full-hole core of target area is obtained.
It is understood that full-hole core refers to be taken out from oil (gas) layer with CORING TECHNOLOGY in the embodiment of the present invention
Cylindrical rock core, not by cutting.
The diameter of full-hole core is not particularly limited, can be determine according to actual needs.
The upper and lower end face of full diameter can be polished, in order to follow-up test.
Step 202, the direction of the horizontal minimum principal stress of full-hole core and the direction of horizontal maximum principal stress are determined.
In the embodiment of the present invention, when can be propagated in full-hole core along full-hole core different radii by determining longitudinal wave
Corresponding second radius of minimum value of corresponding first radius of the maximum value of spread speed and spread speed, the first radius place
Rectilinear direction be horizontal minimum principal stress direction, the rectilinear direction where the second radius is horizontal maximum principal stress
Direction.
Wherein, the radius of full-hole core refers to full-hole core along the radius perpendicular to its axis direction section.
It should be noted that rock core will do it stress release after being extracted, and after stress release, the gap quilt in rock core
Air filling, since the aerial spread speed of longitudinal wave is less than spread speed in solids, longitudinal wave is in full diameter rock
Spread speed is faster in the heart, illustrates that air in this direction is fewer, and stress is also just smaller；Conversely, longitudinal wave is in full-hole core
Middle spread speed is slower, illustrates that air in this direction is more, accordingly, it is determined that determined longitudinal wave propagation speed maximum value and
The corresponding direction of minimum value is direction and the water bottle biggest principal stress direction that can determine horizontal minimum principal stress.
Specifically, direction and the level of the horizontal minimum principal stress of full-hole core can be determined by following steps
The direction of maximum principal stress.
Step 2021, as shown in Fig. 3 (or Fig. 4), angle is drawn with the first predetermined angle in the upper surface of full-hole core 1
Bisector, and using any one angle bisecting line as 0 ° of mark line of level, every angle bisecting line is marked along clockwise direction
Angle.
It is understood that each angle bisecting line is a radius of full-hole core 1.
In the embodiment of the present invention, the quantity that data point when influencing subsequent fitting function is set of the first predetermined angle, first
Predetermined angle is smaller, and the quantity of data point is more, and the function being fitted is more accurate, but will increase the workload of test.It is comprehensive
The accuracy and test job amount for considering fitting result are closed, the first predetermined angle can be 10 °.
Step 2022, using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured.
Specific operation process are as follows: the ultrasonic wave transmitting probe of supersonic wave test instrument is placed on angle bisector to be measured and complete
At the position of the side surface intersection of diameter rock core 1, the ultrasonic wave receiving transducer of supersonic wave test instrument is placed on angle to be measured etc.
At the position that separated time reverse extending line intersects with the side surface of full-hole core 1 namely the ultrasonic wave of supersonic wave test instrument emits
The ultrasonic wave receiving transducer of probe, the center of circle of full-hole core 1 and supersonic wave test instrument is respectively positioned on angle bisector institute to be measured
Straight line on.By longitudinal wave propagation away from discrete time, to calculate propagation speed of the longitudinal wave along 1 radial direction of full-hole core
Degree.
As shown in Fig. 3 (or Fig. 4), when drawing angle bisecting line with 10 ° of gradient, two angle bisectings of 180 ° of difference
Line is located in a straight line, the corresponding same horizontal stress direction of two angle bisecting lines of 180 ° of difference.
Can on the axis direction along full-hole core 1, to the longitudinal wave propagation speed in the same horizontal stress direction into
Row repeatedly measures and calculates average value, using average value as the longitudinal wave propagation speed in the horizontal stress direction.
Step 2023, obtain full-hole core in, longitudinal wave propagation speed with angle change first function.
It is obtained in a series of full-hole cores 1 after the corresponding relationship of angle and longitudinal wave propagation speed in step 2022, into
Line function fitting, thus obtain characterization full-hole core 1 in longitudinal wave propagation speed with angle change first function.First function
It can be SIN function.
Step 2024, the maximum value and minimum value and first function that first function is sought within the scope of 0 °~180 ° are most
It is worth the corresponding angle beta of corresponding angle [alpha], minimum value greatly.
Since for full-hole core 1,0 °~180 ° and 180 °~360 ° are symmetrically, therefore, at 0 °~180 °
The maximum value and minimum value of first function are sought in range.
The corresponding angle [alpha] of the maximum value of first function is horizontal minimum principal stress direction, the minimum value pair of first function
The angle beta answered is horizontal biggest principal stress direction.
Step 203, the first rock core inwardly is drilled through along horizontal minimum principal stress direction from the side surface of full-hole core, along water
Flat biggest principal stress direction drills through the second rock core.
First rock core 3 and the second rock core 2 are cylinder.As shown in Figure 3 and Figure 4, the axis direction and water of the first rock core 3
The direction of flat minimum principal stress is parallel and is located in the plane of the same axis for being parallel to full-hole core 1, the second rock core 2
Axis direction is parallel with the direction of horizontal maximum principal stress and is located at the plane of the same axis for being parallel to full-hole core 1
It is interior.
The diameter of first rock core 3 and the second rock core 2 does not limit strictly, such as can be 50.8mm.First rock core 3 and
The thickness of two rock cores 2 does not also limit strictly, as long as the probe of supersonic wave test instrument can be accommodated.
Step 204, the maximum value of spread speed when longitudinal wave is propagated in the second rock core along the second rock core different radii is determined
The angle, θ that corresponding radius turns on along clockwise direction relative to vertical 0 ° of mark line.
Step 204 can specifically be realized by following steps:
Step 2041, it is marked apart from nearest radius as vertical 0 ° using in the second rock core 2 with the upper surface of full-hole core 1
Remember line, along clockwise direction, angle bisecting line is drawn with the second predetermined angle on the end face of the second rock core 2 and marks every angle
Spend the angle of bisector.
Vertical 0 ° of mark line of second rock core 2 is the angle bisecting line in Fig. 3 straight up.
The numerical value of second predetermined angle is also not particularly limited, such as can be 10 °.
Step 2042, using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured.
The specific operation process of step 2042 can refer to the description of above-mentioned steps 2022, and details are not described herein.
Step 2043, obtain the second rock core in, longitudinal wave propagation speed with angle change second function.
It obtains in a series of second rock cores 2 after the corresponding relationship of angle and longitudinal wave propagation speed, carries out in step 2042
Function Fitting, thus obtain characterization the second rock core 2 in longitudinal wave propagation speed with angle change second function.Second function can also
Think SIN function.
Step 2044, the maximum value of maximum value and second function that second function is sought within the scope of 0 °~180 ° is corresponding
Angle, θ.
As described above, if θ is less than 45 °, the In-situ stress state of target area are as follows: σHmax>σHmin>σν。
If θ is greater than 45 °, σν>σHmin, also need to continue to judge that vertical principal stress and level are maximum by following steps 205
Relationship between principal stress.
Step 205, the maximum value of spread speed when longitudinal wave is propagated in the first rock core along the first rock core different radii is determined
The angle γ that corresponding radius turns on along clockwise direction relative to vertical 0 ° of mark line.
Likewise, step 205 can specifically be realized by following steps.
Step 2051, it is marked apart from nearest radius as vertical 0 ° using in the first rock core 3 with the upper surface of full-hole core 1
Remember line, along clockwise direction, angle bisecting line is drawn with third predetermined angle on the end face of the first rock core 3 and marks every angle
Spend the angle of bisector.Vertical 0 ° of mark line of first rock core 3 is the angle bisecting line in Fig. 4 straight up.
The numerical value of third predetermined angle is also not particularly limited, such as can be 10 °.
Step 2052, using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured.
The specific operation process of step 2052 is see also the description of above-mentioned steps 2022, and details are not described herein.
Step 2053, obtain the first rock core in, longitudinal wave propagation speed with angle change third function.
It obtains in a series of first rock cores 3 after the corresponding relationship of angle and longitudinal wave propagation speed, carries out in step 2052
Function Fitting, thus obtain characterization the first rock core 3 in longitudinal wave propagation speed with angle change third function.Third function can also
Think SIN function.
Step 2054, the maximum value of maximum value and third function that third function is sought within the scope of 0 °~180 ° is corresponding
Angle γ.
If γ is less than 45 °, the In-situ stress state of target area are as follows: σHmax>σν>σHmin；If γ is greater than 45 °,
The In-situ stress state of target area are as follows: σν>σHmax>σHmin。
In the following, by taking the Sinian Dengying group natural gas prospect pit of the Sichuan Basin as an example, to answering provided in an embodiment of the present inventionly
Field of force state test method is described further.
Using non-directional coring method, chooses 5328.4 meters of buried depth of full-hole core and carry out In-situ stress state test.Tool
Steps are as follows for body:
1) full-hole core upper and lower end face is polished, draws angle etc. with 10 ° in the upper surface of full-hole core for gradient
Separated time simultaneously marks the corresponding angle of every angle bisecting line along clockwise direction.
2) the corresponding longitudinal wave propagation speed of every angle bisecting line is measured using supersonic wave test instrument.
3) longitudinal wave propagation speed and angle are subjected to SIN function fitting, and seek gained fitting function (i.e. first function)
Maximum value and minimum value and the corresponding angle [alpha] of maximum value and the corresponding angle beta of minimum value within the scope of 0 °~180 °,
Middle α=40 °, β=130 °.
4) cylindrical the first rock core and the inwardly are drilled through along 40 ° of directions and 130 ° of directions from the side surface of full diameter respectively
The diameter of two rock cores, the first rock core and the second rock core is 50.8mm.
5) by the first rock core and the second rock core respectively using the upper surface with full-hole core apart from nearest radius as hang down
To 0 ° of mark line, angle bisecting line is drawn for gradient with 10 ° along clockwise direction and marks the corresponding angle of every angle bisecting line
Degree, and the longitudinal wave rate of the first rock core and the second rock core on different angle direction is tested respectively.
6) obtain characterization the second rock core in longitudinal wave propagation speed with angle change Sine-Fitting function (i.e. second function),
Seek 45 ° of fitting function maximum value corresponding angle θ, θ=79.5 ° >, therefore σHmin<σν；
Then obtain characterization the first rock core in longitudinal wave propagation speed with angle change Sine-Fitting function (i.e. third letter
Number), fitting function maximum value corresponding angle γ is sought, γ=12.3 ° < 45 ° then finally show that In-situ stress state is σHmax>σν
>σHmin, i.e., vertical principal stress is between horizontal maximum principal stress and horizontal minimum principal stress.
The test result of above-mentioned Center Vertically matches with this area's development strike-slip fault,
In order to further verify the reliability of test method provided in an embodiment of the present invention, below still with the above-mentioned Sichuan Basin
For Sinian Dengying group natural gas prospect pit, its In-situ stress state is determined using the method for theoretical calculation.
The rock core of identical interval is had chosen according to orientation shown in Fig. 5, in the horizontal plane vertical with drill core axis, increment
Three pieces of rock samples are drilled through for 45 ° of directions, measure direct stress at the Kaiser point in three directions, are then found out horizontal maximum, minimum
Principal stress；Vertical principal stress is determined by the crustal stress of the vertical rock sample Kaiser point parallel with core axis.Test result is aobvious
Show that vertical principal stress is 139.1MPa, horizontal maximum principal stress is 144.5MPa, and horizontal minimum principal stress is 119.2MPa, then
Stress field state is σHmax>σν>σHminThat is Center Vertically, it is identical as the test result of test method provided in an embodiment of the present invention,
Proving that test method provided in an embodiment of the present invention is used to test In-situ stress state is accurately and reliably.
The above is merely for convenience of it will be understood by those skilled in the art that technical solution of the present invention, not to limit
The present invention.All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this
Within the protection scope of invention.
Claims (9)
1. a kind of In-situ stress state test method, which is characterized in that the test method includes:
Step a obtains the full-hole core of target area；
Step b determines the direction of the horizontal minimum principal stress of the full-hole core and the direction of horizontal maximum principal stress；
Step c inwardly drills through the first rock core, edge along the horizontal minimum principal stress direction from the side surface of the full-hole core
The horizontal biggest principal stress direction drills through the second rock core；
Step d determines the maximum of spread speed when longitudinal wave is propagated in second rock core along the second rock core different radii
It is worth the angle, θ that corresponding radius turns on along clockwise direction relative to vertical 0 ° of mark line, it is described if θ is less than 45 °
The In-situ stress state of target area are as follows: the horizontal horizontal vertical principal stress of minimum principal stress > of maximum principal stress >；
If θ is greater than 45 °, it is determined that propagate speed when longitudinal wave is propagated in first rock core along the first rock core different radii
The angle γ that the corresponding radius of the maximum value of degree turns on along clockwise direction relative to vertical 0 ° of mark line, if γ is less than
45 °, the In-situ stress state of the target area are as follows: the horizontal vertical horizontal minimum principal stress of principal stress > of maximum principal stress >；
If γ is greater than 45 °, the In-situ stress state of the target area are as follows: the vertical horizontal maximum principal stress > level of principal stress > is most
Minor principal stress；
Vertical 0 ° of mark line be in first rock core and second rock core with the upper surface of the full-hole core away from
From nearest radius.
2. In-situ stress state test method according to claim 1, which is characterized in that the step b includes:
Determine the maximum value of spread speed when longitudinal wave is propagated in the full-hole core along the full-hole core different radii
Corresponding second radius of the minimum value of corresponding first radius and spread speed, the rectilinear direction where first radius are
For the direction of the horizontal minimum principal stress, the rectilinear direction where second radius is the horizontal maximum principal stress
Direction.
3. In-situ stress state test method according to claim 2, which is characterized in that the determining longitudinal wave is described complete
Corresponding first radius of maximum value and biography of spread speed when being propagated in diameter rock core along the full-hole core different radii
Broadcast corresponding second radius of minimum value of speed, comprising:
Angle bisecting line is drawn with the first predetermined angle in the upper surface of the full-hole core, and with any one angle bisecting
Line marks the angle of every angle bisecting line as 0 ° of mark line of level along clockwise direction；
Using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured；
Obtain in the full-hole core, longitudinal wave propagation speed with angle change first function；
The maximum value of the first function and the maximum value of minimum value and the first function are sought within the scope of 0 °~180 °
The corresponding angle beta of corresponding angle [alpha], minimum value.
4. In-situ stress state test method according to claim 3, which is characterized in that first predetermined angle is
10 °, the first function is SIN function.
5. In-situ stress state test method according to claim 1, which is characterized in that in the step d, the determination
The corresponding radius of maximum value of spread speed exists when longitudinal wave is propagated in second rock core along the second rock core different radii
The angle, θ turned on along clockwise direction relative to vertical 0 ° of mark line, comprising:
It is marked apart from nearest radius as described vertical 0 ° using in second rock core with the upper surface of the full-hole core
Line draws angle bisecting line on the end face of second rock core with the second predetermined angle and marks every along clockwise direction
The angle of angle bisecting line；
Using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured；
Obtain in second rock core, longitudinal wave propagation speed with angle change second function；
The corresponding angle of maximum value of the maximum value and the second function of the second function is sought within the scope of 0 °~180 °
Spend θ.
6. In-situ stress state test method according to claim 5, which is characterized in that second predetermined angle is
10 °, the second function is SIN function.
7. In-situ stress state test method according to claim 1, which is characterized in that in the step d, the determination
The corresponding radius of maximum value of spread speed exists when longitudinal wave is propagated in first rock core along the first rock core different radii
The angle γ turned on along clockwise direction relative to vertical 0 ° of mark line, comprising:
It is marked apart from nearest radius as described vertical 0 ° using in first rock core with the upper surface of the full-hole core
Line draws angle bisecting line on the end face of first rock core with third predetermined angle and marks every along clockwise direction
The angle of angle bisecting line；
Using supersonic wave test instrument, the spread speed that longitudinal wave is propagated along every angle bisecting line is measured；
Obtain in first rock core, longitudinal wave propagation speed with angle change third function；
The maximum value of the third function and the corresponding angle of maximum value of the third function are sought within the scope of 0 °~180 °
Spend γ.
8. In-situ stress state test method according to claim 7, which is characterized in that the third predetermined angle is
10 °, the third function is SIN function.
9. described in any item In-situ stress state test methods according to claim 1~8, which is characterized in that first rock
The diameter of the heart and second rock core is 50.8 millimeters.
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