CN102628962B - Seismic acquisition observation system for underground microseismic detection - Google Patents
Seismic acquisition observation system for underground microseismic detection Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 15
- 238000009826 distribution Methods 0.000 claims abstract description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 12
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- 238000013480 data collection Methods 0.000 description 1
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Abstract
The invention relates to a seismic acquisition observation system for underground microseismic detection, so that a problem that an existing system can not form a three-dimensional image can be solved. The provided system is formed by a plurality of concentric circles by taking a wellhead as a center O, thereby forming a circle-shaped structure. The number of receiving points arranged on each circumference varies and is generally increased with the increase of the circumference, so that uniformity of distribution of the receiving points can be kept. Received seismic data are in a circle-shaped three-dimensional structure with uniform arrangement, so that the attribute of a seismic wave can be displayed in a three-dimensional mode. Besides, the number of the receiving points arranged on the circumference doubles the number of the receiving points at an innermost ring and the arrangement is uniform; and a radial structure is formed while the circle-shaped structure is formed, wherein each radial ray can be used as a two-dimensional profile to display the attribute of the seismic wave. According to the invention, effectiveness and economy of the underground microseismic detection are fully considered; and the arrangement is simple and can be realized easily; a three-dimensional image can be formed; and the received seismic data are in the circle-shaped three-dimensional structure with the uniform arrangement, so that the attribute of the seismic wave can be displayed in a three-dimensional mode.
Description
Technical field
The present invention relates to a kind of microseismic detection recording geometry, particularly relate to a kind of seismic event carrying out down-hole microseismic detection and gather recording geometry.
Technical background
When seismic prospecting, in order to obtain the seismologic record systematically can following the trail of zone of interest significant wave, suitably must arrange the mutual alignment with selective excitation point and acceptance point in the wild during data collection, between this description shot point and acceptance point and arrangement with arrangement between position relationship be called recording geometry.
It is a kind of more special recording geometry that the seismic event of down-hole microseismic detection gathers recording geometry, and the microseism produced of breaking when its excitaton source is reservoir fracturing, is distributed in around well, has randomness.And energy is more weak, signal to noise ratio (S/N ratio) is very low.The observing system of current employing is radial, centered by well head, is radially stretched out by some surveys line.Its advantage lays simply, and easily realize, shortcoming is that decentering point is far away, and circular arc direction spacing is larger, can not form 3-D view.
Summary of the invention
The object of the invention is the above-mentioned defect overcoming prior art, provides a kind of seismic event carrying out down-hole microseismic detection that can form 3-D view to gather recording geometry.Be that the seismic event detecting down-hole microseism gathers recording geometry, when being also a kind of production wells fracturing, produce the method for seismic event.
The present invention is that a kind of seismic event carrying out down-hole microseismic detection gathers recording geometry, the seismic event produced during for detecting pressure break in well.This recording geometry take well head as center of circle O, is made up of multiple concentric circles, forms cyclic structure, and each reception circumferentially arranged is counted can be different, generally increase along with the increase of circumference, are evenly distributed to keep acceptance point.
Acceptance point is by the distribution of requirement as follows: we define i-th concentrically ringed radius be Ri (i=1,2 ..., max), then have: minimum radius of a circle is R1, maximum radius of a circle is Rmax; The girth of i-th circle is Ci=2 π Ri, i-th circle and the i-th+1 radius of a circle difference DRi=R (i+1)-Ri.
Be defined in i-th circumferentially lay Mi acceptance point and be uniformly distributed, and Mi=N × 2
m(N=3,4,5,6,7,8, M=0,1,2,3 ...) then have: the arc length DLi=2 π Ri/Mi between 2 acceptance points.Definition shortest arc is long is DLmin, and most long arc is long is DLmax, then have: DLmin≤DLi≤DLmax.
According to above definition, we illustrate the seismic event detecting down-hole microseism and gather recording geometry (see Fig. 1): be 1. made up of multiple concentric circles, form cyclic structure, i-th concentrically ringed radius is Ri (i=1,2 ..., max), minimum radius of a circle is R1, and maximum radius of a circle is Rmax; 2. the radial direction spacing (abbreviation span) of acceptance point is DRi; 3. the spacing (abbreviation arc distance) of acceptance point circumferencial direction is DLi, and has DLmin≤DLi≤DLmax.4. circumferentially lay Mi acceptance point and be uniformly distributed for i-th, and Mi=N × 2
m(N=3,4,5,6,7,8, M=0,1,2,3 ...).
The present invention has taken into full account validity and the economy of down-hole microseismic detection, lays simple, easily realizes, it can form 3-D view, the geological data received is round three-dimensional structure, and lays relatively even, can carry out the attribute of 3 D stereo explicitly seismic wave.
As optimization, the geological data of reception is cyclic structure, can using the attribute of each circle as a two dimensional cross-section explicitly seismic wave.
As optimization, owing to defining 2 multiples (except innermost circle) that the acceptance point number circumferentially laid is innermost circle and being uniformly distributed, while there is cyclic structure, there is radial structure, can using the attribute of each ray as a two dimensional cross-section explicitly seismic wave.
As optimization, can be constant at radial direction spacing (abbreviation span) DRi of acceptance point, but the spacing of acceptance point circumferencial direction (abbreviation arc distance) DLi can not be then constant, can only limit within the specific limits, and have DLmin≤DLi≤DLmax.
As optimization, the seismic event that the present invention detects down-hole microseism gathers recording geometry, is a kind of regular geometry ideally, in the wild during practical application, due to the restriction by surficial geology condition and ground surface environment condition, Reasonable adjustment can be made according to actual conditions.
As optimization, said system is a kind of regular geometry ideally, in the wild during practical application, due to the restriction by surficial geology condition and ground surface environment condition, can be not too regular, and namely span DRi and arc distance DLi all can change within the specific limits.There is DRmin≤DRi≤DRmax; DLmin≤DLi≤DLmax, wherein DRmin and DRmax is respectively the minimum of permission and maximum diameter distance, DLmin and DLmax is respectively the minimum and maximum arc distance of permission.
The seismic event that the present invention carries out down-hole microseismic detection gathers validity and the economy that recording geometry has taken into full account down-hole microseismic detection, and lay simple, easy realization, 3-D view can be formed, the geological data received is round three-dimensional structure, and lay relatively even, the attribute of 3 D stereo explicitly seismic wave can be carried out.
Accompanying drawing explanation
Fig. 1 is that the seismic event of down-hole of the present invention microseismic detection gathers recording geometry schematic diagram.
Embodiment
As shown in the figure, the present invention is that a kind of seismic event carrying out down-hole microseismic detection gathers recording geometry, the seismic event produced during for detecting pressure break in well.This recording geometry take well head as center of circle O, is made up of multiple concentric circles, forms cyclic structure, and each reception circumferentially arranged is counted can be different, generally increase along with the increase of circumference, are evenly distributed to keep acceptance point.
We define i-th concentrically ringed radius be Ri (i=1,2 ..., max), then have: minimum radius of a circle is R1, maximum radius of a circle is Rmax; The girth of i-th circle is Ci=2 π Ri, i-th circle and the i-th+1 radius of a circle difference DRi=R (i+1)-Ri.
Be defined in i-th circumferentially lay Mi acceptance point and be uniformly distributed, and Mi=N × 2
m(N=3,4,5,6,7,8, M=0,1,2,3 ...) then have: the arc length DLi=2 π Ri/Mi between 2 acceptance points.Definition shortest arc is long is DLmin, and most long arc is long is DLmax, then have: DLmin≤DLi≤DLmax.
According to above definition, we illustrate the seismic event detecting down-hole microseism and gather recording geometry (see Fig. 1): be 1. made up of multiple concentric circles, form cyclic structure, i-th concentrically ringed radius is Ri (i=1,2 ..., max), minimum radius of a circle is R1, and maximum radius of a circle is Rmax; 2. the radial direction spacing (abbreviation span) of acceptance point is DRi; 3. the spacing (abbreviation arc distance) of acceptance point circumferencial direction is DLi, and has DLmin≤DLi≤DLmax.4. circumferentially lay Mi acceptance point and be uniformly distributed for i-th, and Mi=N × 2
m(N=3,4,5,6,7,8, M=0,1,2,3 ...).
It is round three-dimensional structure that seismic event of the present invention gathers the geological data that recording geometry receives, and lays relatively more even, can carry out the attribute of 3 D stereo explicitly seismic wave.
It is cyclic structure that seismic event of the present invention gathers the geological data that recording geometry receives, can using the attribute of each circle as a two dimensional cross-section explicitly seismic wave.
Seismic event of the present invention gathers recording geometry owing to defining 2 multiples (except innermost circle) that the acceptance point number circumferentially laid is innermost circle and being uniformly distributed, while there is cyclic structure, there is radial structure, can using the attribute of each ray as a two dimensional cross-section explicitly seismic wave.
It can be constant at radial direction spacing (abbreviation span) DRi of acceptance point that seismic event of the present invention gathers recording geometry, but the spacing of acceptance point circumferencial direction (abbreviation arc distance) DLi can not be then constant, can only limit within the specific limits, and have DLmin≤DLi≤DLmax.
It is a kind of regular geometry ideally that seismic event of the present invention gathers recording geometry, in the wild during practical application, due to the restriction by surficial geology condition and ground surface environment condition, can make Reasonable adjustment according to actual conditions.
It is a kind of regular geometry ideally that seismic event of the present invention gathers recording geometry, in the wild during practical application, due to the restriction by surficial geology condition and ground surface environment condition, can be not too regular, namely span DRi and arc distance DLi all can change within the specific limits.There is DRmin≤DRi≤DRmax; DLmin≤DLi≤DLmax, wherein DRmin and DRmax is respectively the minimum of permission and maximum diameter distance, DLmin and DLmax is respectively the minimum and maximum arc distance of permission.
Example:
If: R1=50m; Rmax=2000m; DR=25m; DLmin=20m; DLmax=40m; N=8.
Then have:
1. recording geometry is made up of 79 concentric circless, and smallest circle radius R 1 is 50m, and greatest circle radius R max is 2000m, and smallest circle girth is 314m, and greatest circle girth is 12560m,
2. radial direction spacing (abbreviation span) DR of acceptance point is 25m;
3. the spacing (abbreviation arc distance) of acceptance point circumferencial direction is DLi, and has 20m≤DLi≤40m
4. circumferentially evenly lay 8 acceptance points for the 1st, circumferentially evenly lay 16 acceptance points for 2nd ~ 3; Circumferentially evenly lay 32 acceptance points for 4th ~ 7; Circumferentially evenly lay 64 acceptance points for 8th ~ 15; Circumferentially evenly lay 128 acceptance points for 16th ~ 31; Circumferentially evenly lay 256 acceptance points for 32nd ~ 64; Circumferentially evenly lay 512 acceptance points for 65th ~ 79.
5. whole recording geometry is laid with 18856 acceptance points.
Laying situation on each concentric circles is in table 1.
Table 1: recording geometry parameter list
Claims (3)
1. the seismic event carrying out down-hole microseismic detection gathers a recording geometry, it is characterized in that system take well head as center of circle O, is made up of multiple concentric circles, form cyclic structure, each reception circumferentially arranged is counted difference, increases, be evenly distributed to keep acceptance point along with the increase of circumference;
The geological data received is round three-dimensional structure, and lays evenly, can carry out the attribute of 3 D stereo explicitly seismic wave; Or the geological data received is cyclic structure, using the attribute of each circle as a two dimensional cross-section explicitly seismic wave; Or the acceptance point number circumferentially laid is 2 multiples of innermost circle and is uniformly distributed, and while having cyclic structure, has radial structure, using the attribute of each ray as a two dimensional cross-section explicitly seismic wave;
Described acceptance point is by requirement distribution as follows: defining i-th concentrically ringed radius is Ri, i=1, and 2, max, then have: minimum radius of a circle is R1, and maximum radius of a circle is Rmax; The girth of i-th circle is Ci=2 π Ri, i-th circle and the i-th+1 radius of a circle difference DRi=R (i+1)-Ri;
Be defined in i-th circumferentially lay Mi acceptance point and be uniformly distributed, and Mi=N × 2
m, N=3,4,5,6,7,8; M=0,1,2,3, then have: the arc length DLi=2 π Ri/Mi between 2 acceptance points; Definition shortest arc is long is DLmin, and most long arc is long is DLmax, then have: DLmin≤DLi≤DLmax;
According to above definition, provide system: be 1. made up of multiple concentric circles, form cyclic structure, i-th concentrically ringed radius is Ri, i=1,2, max, and minimum radius of a circle is R1, and maximum radius of a circle is Rmax; 2. the semidiameter of acceptance point is DRi; 3. the arc length of acceptance point circumferencial direction spacing is DLi, and has DLmin≤DLi≤DLmax; 4. circumferentially lay Mi acceptance point and be uniformly distributed for i-th, and Mi=N × 2
m, N=3,4,5,6,7,8; M=0,1,2,3.
2. system according to claim 1, it is characterized in that at the semidiameter DRi of acceptance point be constant, the arc length DLi of acceptance point circumferencial direction spacing is not then constant, is only limited in certain limit, and has DLmin≤DLi≤DLmax.
3. system according to claim 1, it is characterized in that a kind of regular geometry ideally, in the wild during practical application, due to the restriction by surficial geology condition and ground surface environment condition, makes Reasonable adjustment according to actual conditions; Described Reasonable adjustment is: in the wild during practical application, due to the restriction by surficial geology condition and ground surface environment condition, the semidiameter DRi of acceptance point and the arc length DLi of acceptance point circumferencial direction spacing all can change within the specific limits, i.e. DRmin≤DRi≤DRmax; DLmin≤DLi≤DLmax, wherein DRmin and DRmax be respectively the minimum of permission and maximum radius poor, DLmin and DLmax is respectively the arc length of the minimum of permission and maximum spacing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110341081.8A CN102628962B (en) | 2011-11-02 | 2011-11-02 | Seismic acquisition observation system for underground microseismic detection |
| PCT/CN2012/001476 WO2013063866A1 (en) | 2011-11-02 | 2012-10-31 | Specialized digital seismometer measuring microtremors in wells |
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| CN201110341081.8A CN102628962B (en) | 2011-11-02 | 2011-11-02 | Seismic acquisition observation system for underground microseismic detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105388513A (en) * | 2015-10-15 | 2016-03-09 | 中国石油天然气集团公司 | Method and device for establishing earthquake acquisition and observation system |
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| WO2013063866A1 (en) * | 2011-11-02 | 2013-05-10 | 中国科学院地质与地球物理研究所 | Specialized digital seismometer measuring microtremors in wells |
| CN103147800B (en) * | 2013-04-01 | 2014-10-22 | 北京市市政工程研究院 | Tunnel monitoring measurement early warning method represented by using tree ring |
| CN103760595B (en) * | 2014-01-13 | 2015-07-22 | 中国科学院武汉岩土力学研究所 | Method for arranging microquake real-time monitoring sensors in large-diameter surge shaft excavation process |
| CN105467436B (en) * | 2015-12-17 | 2017-08-11 | 东北大学 | The method for arranging of microseismic sensors a kind of work progress suitable for ultra-deep shaft |
| CN105676279B (en) * | 2016-01-18 | 2017-12-08 | 长江地球物理探测（武汉）有限公司 | A kind of earthquake reflective data acquisition method using geophone offsets such as concentric circles |
| CN106154315A (en) * | 2016-08-24 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of high-density seismic acquisition method symmetrically and evenly |
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| US8228759B2 (en) * | 2003-11-21 | 2012-07-24 | Fairfield Industries Incorporated | System for transmission of seismic data |
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| CN1168997C (en) * | 1999-09-15 | 2004-09-29 | 埃克森美孚上游研究公司 | Remote reservoir resistivity mapping |
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