CN104570089A - Optimized design method of nested observing systems - Google Patents
Optimized design method of nested observing systems Download PDFInfo
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- CN104570089A CN104570089A CN201310520949.XA CN201310520949A CN104570089A CN 104570089 A CN104570089 A CN 104570089A CN 201310520949 A CN201310520949 A CN 201310520949A CN 104570089 A CN104570089 A CN 104570089A
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Abstract
The invention relates to an optimized design method of nested observing systems in geophysical exploration and collection. The method comprises the steps that the receiving line distance for the primary collection is 2<n> times of the surface element lateral dimension, the exciting line distance is 2<n> times of the surface element longitudinal dimension, the receiving line distance for the secondary collection is unchanged, the exciting line distance is unchanged, a receiving line is parallelly shifted by 2<n-1> times of the surface element lateral dimension, and an exciting line is parallelly shifted by 2<n-1> times of the surface element longitudinal dimension till the collection line distance is equal to 2<2> times of the surface element dimension, so that a series of observing systems is obtained. The optimized design method has the advantages that high-density data collection can be realized on the basis of effective cost control, new and old data can be sufficiently utilized, the attributes of the observing systems are uniform and symmetrical, and the final imaging effect is optimum.
Description
Technical field
The present invention relates to geophysical exploration method, is make earthquake-capturing reach a kind of nested type recording geometry Optimization Design of the best price/performance ratio by designing a series of recording geometry.
Background technology
Geophysical prospecting for oil is based on geophysics and oil geology theory, adopt corresponding geophysical instrument and be equipped in earth surface (comprising land and ocean), or, record subsurface information in well aloft, and physical property (elasticity, electrical, magnetic, density, radioactivity) and the structure of subsurface formations is obtained by corresponding data process and interpretation, find the method for the petroleum and natural gas hidden in the earth formation.
Seismic prospecting is the means that geophysical survey is conventional, need shot point and acceptance point to form the arrangement sheet of Continuous Observation according to certain way when implementing seismic prospecting, complete this combination and recording geometry design, it directly determines the final quality gathering achievement.
Current high-density acquisition technique has become the main acquisition method of complex area seismic prospecting, the field acquisition workload but high-density acquisition certainly will be multiplied, and reduce operating efficiency, the disposable input of acquisition cost is huge.On the other hand, the ripe blocks in some exploratory areas, although carried out multi collect, not association between the data at every turn collected, can only be used for when time exploration, the existing collection resource of significant wastage.Reason is that the design parameter of use is different because several schemes of front and back design are not considered from the overall situation, result in the old and new's data in conjunction with time can destroy the homogeneity of recording geometry entirety.
Intend full stereo observing system designing technique when secondary acquisition by scheme 90-degree rotation being realized the fusion of the old and new's scheme, but there is two problems in the method, one be integrate after scheme cannot ensure symmetry, uniform sampling on horizontal and vertical; Two are through twice collection rear space sampling density cannot improve further.
Therefore, under existing investment condition, how to make the recording geometry designed the scheme of priority different acquisition can be merged mutually, ensure making full use of of old data, become the problem needing to solve.
Summary of the invention
The object of the invention is to provide on a kind of basis of effectively controlling cost and realizes high density data collection, and the old and new's data can be made to be fully used, and symmetrically, final imaging effect reaches best nested type recording geometry Optimization Design to recording geometry attribute.
The present invention adopts following steps to realize:
1) conventional vision systems method for designing is adopted to determine bin size in acquisition scheme parameter first, shot point apart from, acceptance point apart from, maximum vertical misalignment apart from, most cross line distance;
Bin size described in step 1) comprises bin longitudinal size and bin lateral dimension.
Shot point distance described in step 1) is generally 2 times of bin lateral dimension, and acceptance point distance is generally 2 times of bin longitudinal size.
Bin size described in step 1), shot point distance, acceptance point are apart from remaining unchanged in multi collect, and maximum vertical misalignment distance, most cross line distance can adjust in multi collect.
2) the reception line-spacing gathered first is 2 of bin lateral dimension
ndoubly, excitation line distance is 2 of bin longitudinal size
ndoubly;
Wherein n is integer, is 1 to 8;
Step 2) described in n size determine according to the demand of real cost of production.
3) conditional synchronization rapid 1 of secondary acquisition employing), receive line-spacing constant, excitation line is apart from constant; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
n-1doubly, excitation line moves in parallel 2 of bin longitudinal size
n-1doubly;
4) conditional synchronization rapid 1 adopted is gathered three times), receiving line-spacing is 2 of bin lateral dimension
n-1doubly, excitation line distance is 2 of bin longitudinal size
n-1doubly; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
n-2doubly, excitation line moves in parallel 2 of bin longitudinal size
n-2doubly;
5) conditional synchronization rapid 1 adopted is gathered four times), receiving line-spacing is 2 of bin lateral dimension
n-2doubly, excitation line distance is 2 of bin longitudinal size
n-2doubly; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
n-3doubly, excitation line moves in parallel 2 of bin longitudinal size
n-3doubly;
6) step 5) is repeated, until the line-spacing gathered equals 2 of bin size
2doubly, a series of mutually nested recording geometry is obtained.
The present invention can design a series of particular acquisition scheme, carry out job design according to this serial scheme, can realize high density data collection on the basis of effectively controlling cost, the old and new's data can be fully used, symmetrically, final imaging effect reaches best to recording geometry attribute.
Accompanying drawing explanation
The design sketch that Fig. 1 gathers first;
The design sketch of Fig. 2 secondary acquisition;
The design sketch that Fig. 3 gathers for tri-times;
The design sketch that Fig. 4 gathers for tetra-times;
Fig. 5 gathers the design sketch after merging with secondary acquisition first;
Fig. 6 gathers first, secondary acquisition and three times collection merge after design sketch;
Fig. 7 gathers first, secondary acquisition, three times gather and four times gather merge after design sketch;
Fig. 8 gathers the design sketch after merging for seven times.
Embodiment
The present invention can be applied to the design analysis of high-density observation system, and specific implementation situation is as follows:
1) the bin lateral dimension adopting conventional vision systems method for designing to determine in acquisition scheme parameter is first 25m, bin longitudinal size is 25m, shot point is apart from for 50m, acceptance point are apart from for 50m, maximum vertical misalignment are apart from being 2225m for 7975m, most cross line distance;
2) the reception line-spacing gathered first is 2 of bin lateral dimension
ndoubly, excitation line distance is 2 of bin longitudinal size
ndoubly;
Line-spacing is determined by Fresnel zone usually, and the Fresnel zone of seismic prospecting is generally less than 500m, and bin size is minimum is 2.5m, so line-spacing is the 500m/2.5m=200 of bin size to the maximum doubly, and namely 2
7.64doubly, n is 8 to the maximum, can meet and produce reality.Get n=4, then receiving line-spacing is that 400m, excitation line are apart from for 400m.Utilize above-mentioned parameter to gather first, obtain the recording geometry in Fig. 1.
3) conditional synchronization rapid 1 of secondary acquisition employing), receive line-spacing constant, excitation line is apart from constant; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
4-1doubly, i.e. 200m; Excitation line moves in parallel 2 of bin longitudinal size
4-1doubly, i.e. 200m, obtains the recording geometry in Fig. 2.
4) conditional synchronization rapid 1 adopted is gathered three times), receiving line-spacing is 2 of bin lateral dimension
4-1doubly, i.e. 200m, excitation line distance is 2 of bin longitudinal size
4-1doubly, i.e. 200m; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
4-2doubly, i.e. 100m, excitation line moves in parallel 2 of bin longitudinal size
4-2doubly, i.e. 100m, obtains the recording geometry in Fig. 3.
5) conditional synchronization rapid 1 adopted is gathered four times), receiving line-spacing is 2 of bin lateral dimension
4-2doubly, i.e. 100m, excitation line distance is 2 of bin longitudinal size
4-2doubly, i.e. 100m; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
4-3doubly, i.e. 50m, excitation line moves in parallel 2 of bin longitudinal size
4-3doubly, i.e. 50m, obtains the recording geometry in Fig. 4.
6) line-spacing gathered for four times has equaled 2 of bin size
2doubly, so far, a series of mutually nested recording geometry is obtained.Fig. 2 can be completely nested with the recording geometry of Fig. 1, obtains the recording geometry of Fig. 5 after fusion.Fig. 3 can be completely nested with the recording geometry of Fig. 1, Fig. 2, obtains the recording geometry of Fig. 6 after fusion.Fig. 4 can be completely nested with the recording geometry in Fig. 1, Fig. 2, Fig. 3, obtains the recording geometry of Fig. 7 after fusion.
Another application of the invention is as follows in the design analysis experimental example of high-density observation system:
1) the bin lateral dimension adopting conventional vision systems method for designing to determine in acquisition scheme parameter is first 2.5m, bin longitudinal size is 2.5m, shot point is apart from for 5m, acceptance point are apart from for 5m, maximum vertical misalignment are apart from being 1280m for 1280m, most cross line distance.
2) the reception line-spacing gathered first is 2 of bin lateral dimension
8doubly, i.e. 640m, excitation line distance is 2 of bin longitudinal size
8doubly, i.e. 640m.
3) conditional synchronization rapid 1 of secondary acquisition employing), receive line-spacing constant, excitation line is apart from constant; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
8-1doubly, i.e. 320m; Excitation line moves in parallel 2 of bin longitudinal size
8-1doubly, i.e. 320m.
4) conditional synchronization rapid 1 adopted is gathered three times), receiving line-spacing is 2 of bin lateral dimension
8-1doubly, i.e. 320m, excitation line distance is 2 of bin longitudinal size
8-1doubly, i.e. 320m; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
8-2doubly, i.e. 160m, excitation line moves in parallel 2 of bin longitudinal size
8-2doubly, i.e. 160m.
5) conditional synchronization rapid 1 adopted is gathered four times), receiving line-spacing is 2 of bin lateral dimension
8-2doubly, i.e. 160m, excitation line distance is 2 of bin longitudinal size
8-2doubly, i.e. 160m; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
8-3doubly, i.e. 80m, excitation line moves in parallel 2 of bin longitudinal size
8-3doubly, i.e. 80m.
6) conditional synchronization rapid 1 adopted is gathered five times), receiving line-spacing is 2 of bin lateral dimension
8-3doubly, i.e. 80m, excitation line distance is 2 of bin longitudinal size
8-3doubly, i.e. 80m; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
8-4doubly, i.e. 40m, excitation line moves in parallel 2 of bin longitudinal size
8-4doubly, i.e. 40m.
7) conditional synchronization rapid 1 adopted is gathered six times), receiving line-spacing is 2 of bin lateral dimension
8-4doubly, i.e. 40m, excitation line distance is 2 of bin longitudinal size
8-4doubly, i.e. 40m; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
8-5doubly, i.e. 20m, excitation line moves in parallel 2 of bin longitudinal size
8-5doubly, i.e. 20m.
8) conditional synchronization rapid 1 adopted is gathered seven times), receiving line-spacing is 2 of bin lateral dimension
8-5doubly, i.e. 20m, excitation line distance is 2 of bin longitudinal size
8-5doubly, i.e. 20m; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
8-6doubly, i.e. 10m, excitation line moves in parallel 2 of bin longitudinal size
8-6doubly, i.e. 10m.
9) conditional synchronization rapid 1 adopted is gathered seven times), receiving line-spacing is 2 of bin lateral dimension
8-6doubly, i.e. 10m, excitation line distance is 2 of bin longitudinal size
8-6doubly, i.e. 10m; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
8-7doubly, i.e. 5m, excitation line moves in parallel 2 of bin longitudinal size
8-7doubly, i.e. 5m.
10) line-spacing gathered for seven times has equaled 2 of bin size
2doubly, so far, a series of mutually nested recording geometry is obtained.The above recording geometry gathered for seven times is completely nested, obtains the recording geometry of Fig. 8 after fusion.
Claims (4)
1. a nested type recording geometry Optimization Design, feature adopts following steps to realize:
1) conventional vision systems method for designing is adopted to determine bin size in acquisition scheme parameter first, shot point apart from, acceptance point apart from, maximum vertical misalignment apart from, most cross line distance;
2) the reception line-spacing gathered first is 2 of bin lateral dimension
ndoubly, excitation line distance is 2 of bin longitudinal size
ndoubly; Wherein n is integer, is 1 to 8;
3) conditional synchronization rapid 1 of secondary acquisition employing), receive line-spacing constant, excitation line is apart from constant; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
n-1doubly, excitation line moves in parallel 2 of bin longitudinal size
n-1doubly;
4) conditional synchronization rapid 1 adopted is gathered three times), receiving line-spacing is 2 of bin lateral dimension
n-1doubly, excitation line distance is 2 of bin longitudinal size
n-1doubly; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
n-2doubly, excitation line moves in parallel 2 of bin longitudinal size
n-2doubly;
5) conditional synchronization rapid 1 adopted is gathered four times), receiving line-spacing is 2 of bin lateral dimension
n-2doubly, excitation line distance is 2 of bin longitudinal size
n-2doubly; Relatively gather first, receive line parallel and move 2 of bin lateral dimension
n-3doubly, excitation line moves in parallel 2 of bin longitudinal size
n-3doubly;
6) step 5) is repeated, until the line-spacing gathered equals 2 of bin size
2doubly, a series of mutually nested recording geometry is obtained.
2. method according to claim 1, feature is that the bin size described in step 1) comprises bin longitudinal size and bin lateral dimension.
3. method according to claim 1, feature is shot point described in step 1) apart from being generally 2 times of bin lateral dimension, and acceptance point is apart from being generally 2 times of bin longitudinal size.
4. method according to claim 1, feature is bin size described in step 1), shot point is apart from, acceptance point apart from remaining unchanged in multi collect; Maximum vertical misalignment distance, most cross line distance can adjust in repeatedly different collections.
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Cited By (1)
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| CN108181644A (en) * | 2017-12-06 | 2018-06-19 | 中国石油天然气集团公司 | A kind of method of sampling and device |
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