CN105372697B - A kind of big array length shooting on group method of seismic prospecting of loess tableland coal field - Google Patents
A kind of big array length shooting on group method of seismic prospecting of loess tableland coal field Download PDFInfo
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- CN105372697B CN105372697B CN201510194728.7A CN201510194728A CN105372697B CN 105372697 B CN105372697 B CN 105372697B CN 201510194728 A CN201510194728 A CN 201510194728A CN 105372697 B CN105372697 B CN 105372697B
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Abstract
The big array length shooting on group seismic exploration technique of a kind of loess tableland coal field provided by the invention, on the basis of common seismic exploration, excitation is combined using big array length, small pit goaf combination well, effectively enhancing seismic wave energy, compacting interference ripple development, for single deep-well, pore forming process is easier, the pore-forming time is short, efficient；For the excitation of small cardinal distance combination well, the compacting to interference has clear improvement, and record quality significantly improves；For concrete operations personnel, operability is stronger, easy to spread, it is easy to accomplish, there is very wide prospects for commercial application.
Description
Technical field
The present invention relates to seismic exploration technique field, more particularly to a kind of big array length shooting on group of loess tableland coal field
Method of seismic prospecting.
Background technology
Using underground medium elasticity and the difference of density, by observing and analyzing sound of the earth to artificial excitation's seismic wave
Should, infer that the property of subterranean strata and the geophysical exploration method of form are called seismic prospecting.Seismic prospecting is surveyed before drilling
The important means of oil and gas resource is surveyed, in sides such as coalfield and engineering geologic investigation, Study on Regional Geology and earth's crust researchs
Face, is also used widely.
Seismic prospecting starts from the middle of the 19th century.1845, seismic wave that R. Ma Lite were once manually excited measured elasticity
Spread speed of the ripple in the earth's crust.This can be described as the rudiment of method of seismic prospecting.It is belligerent double during the World War I
Side all once determined the emplacement of other side using the seismic wave of heavy artillery recoil generation.Nineteen twenty-one, J.C. cards are thorough by bounce technique earthquake
Exploration input practical application, in the clearly back wave that Oklahoma, United States first record to artificial earthquake produces.
China's seismic prospecting starts from 20 middle of century, and the seismic prospecting of Loess Tableland colliery is started from the 1990s, being gram
The strong attenuation by absorption effect of the loose loess formation of shallow-layer is taken, the seismic prospecting of Loess Tableland colliery is first carried out using single deep-well, big dose
Excitation, after be improved to the excitation of small array length (0-5m) combination well, its effect has certain improvement, but to disturbance suppression and carries
Significant improvement is also needed in terms of high effectively wave energy.
The landform of the loess tableland uniqueness in China, landforms have：Plateau, beam, ditch, loess hills, slope, loess ditch is in dendriform distribution, cutting
With erosion loess tableland.Loess is loose, dry, and speed changes in the range of 350-1200m/s, and loess layer thickness is in more than ten rice to number
Between hundred meters.The extreme terrain and collapsible loess of Loess Tableland are loosely organized, and all difficulties are caused to seismic prospecting, such as disturb
Ripple development, seismic wave energy are low etc. by attenuation by absorption, seismic data signal-to-noise ratio, Loess Tableland seismic prospecting is become world-class difficulty
Topic.
The content of the invention
Efficiently disturbance suppression and the above-mentioned of the exploration engineering for improving effective wave energy can be lacked for lacking in the prior art
Fall into and problem, the purpose of the embodiment of the present invention are to provide a kind of big array length shooting on group seismic prospecting side of loess tableland coal field
Method, accuracy rate is high, and effect is preferable, for western loess tableland coal field of seismic exploration, effectively strengthens seismic wave energy, compressed dry
Ripple development is disturbed, improves earthquake record quality.
In order to achieve the above object, the embodiment of the present invention provides following technical solution：
A kind of big array length shooting on group method of seismic prospecting of loess tableland coal field, using big array length, small pit goaf
Combination well is combined excitation, it is characterised in that step is as follows：
Q1：Carry out weathering zone investigation：Determine low, reduction of speed tape thickness, be specifically：Using Bu Deng roads spacing, i.e. reception channel two
End road spacing is small, and interim orbit spacing is big；Received using reversed profile observation system, zero-offset off-end shooting, excitation
Cheat depth 1m, dose 0.5kg；Wherein, reversed profile observation system is the observation system for carrying out weathering zone investigation：Not
Both ends Deng road spacing excite respectively, are received with the same arrangement i.e. wave detector that receives, and obtain the opposite two earthquakes note in direction
Record, for explaining weathering depth at the point；Sample rate 0.5ms, record length 0.5s, spread length are respectively 90m；Distinguish again
Pick up the two record first arrival times, obtain the graph of a relation of a first arrival time and geophone offset, be calculated each layer change
Speed and thickness；
Q2：Earthquake data acquisition：The selection well depths of 2-3m as shooting on group in reduction of speed band, combination well are each when exciting
The flat absolute altitude of well water is consistent；Individual well dose is 1-3Kg at this time；Promote excitaton source excitation plane ripple, increase and soil-structure interactions are rushed
Hit；Combination well combination is to be combined along seismic survey lines dimension linear, or the areal array centered on the shot point of center；
Q3：Effective wave energy and frequency are analyzed, determines the well number of shooting on group, value range combines for 3-7 excitation well；
Combination well array length is set to 10m；
Q4：Seismic signal is received using multiple geophone, wave detector selection 3-5 slotting heaps are embedding, or along linear group of survey line
Close, array length 0-5m；
Q5：Observation system is received using reversed profile observation system.
As the preferred of above-mentioned technical proposal, design parameter when being excited in the Q1 steps is：Excitation hole depth 1m, dose
0.5kg, sample rate 0.5ms, record length 0.5s, spread length are respectively 90m；First break pickup, solution are carried out to the record of acquisition
Release low, reduction of speed tape speed and thickness.
As the preferred of above-mentioned technical proposal, combination well combination is along seismic survey lines direction in the Q2-Q3 steps
Linear combination, or the areal array centered on the shot point of center.
The big array length shooting on group method of seismic prospecting of a kind of loess tableland coal field provided in an embodiment of the present invention, in original
Have and innovated on the basis of data acquisition technology, promote excitaton source excitation plane ripple, increase the impact to soil-structure interactions, increase is made
With area, penetration capacity is improved, not only can effectively suppress random disturbances, but also enhance the transmission capacity of seismic wave；With existing skill
Art is compared, and on the basis of common seismic exploration, excitation is combined using big array length, small pit goaf combination well, is effectively increased
Strong earthquakes wave energy, compacting interference ripple development, for single deep-well, pore forming process is easier, the pore-forming time is short, efficient；
For the excitation of small cardinal distance combination well, the compacting to interference has clear improvement, and record quality significantly improves；To concrete operations
For personnel, operability is stronger, easy to spread, it is easy to accomplish, there is very wide prospects for commercial application.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, without having to pay creative labor, may be used also
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of the low of the big array length shooting on group method of seismic prospecting of loess tableland coal field of the embodiment of the present invention
Speed belt investigates work arrangement schematic diagram.
Fig. 2 is the 7 of the big array length shooting on group method of seismic prospecting of a kind of loess tableland coal field of the embodiment of the present invention
Well linear combination excites schematic diagram.
Fig. 3 is a kind of swashing for the big array length shooting on group method of seismic prospecting of loess tableland coal field of the embodiment of the present invention
Send out well group and close schematic diagram.
Fig. 4 be the embodiment of the present invention a kind of big array length shooting on group method of seismic prospecting of loess tableland coal field into
The earthquake record schematic diagram that excitation obtains when row weathering zone is investigated.
Embodiment
Technical scheme is clearly and completely described below, it is clear that described embodiment is only this
Invention part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art exist
All other embodiments obtained under the premise of creative work are not made, belong to the scope of protection of the invention.
Embodiment 1
1st, carry out weathering zone investigation and determine shooting depth.Away from song when being met using Bu Deng roads spacing (broad in the middle, two is small)
Line observation system, zero-offset off-end shooting, 24 receive；Excitation hole depth 1m, dose 0.5kg, sample rate 0.5ms, record length
0.5s is spent, spread length is respectively 90m, sees Fig. 1.First break pickup is carried out to the record of acquisition, explains low, reduction of speed tape speed and thickness
Degree.
The explanation of reversed profile observation system：In identical extended spread, Fig. 1 is seen, its reception channel both ends road spacing
Small, interim orbit spacing is big, is excited respectively at both ends, same to receive arrangement (grey wave detector) and receive, and it is opposite to obtain direction
Two earthquake record such as Fig. 4, for explaining weathering depth at the point., the first arrival time of the two records is picked up respectively, is obtained
The graph of a relation of one first arrival time and geophone offset, is calculated the speed and thickness of each layer of change.
2nd, 2-3m is as shooting depth in selection reduction of speed band, and each flat absolute altitude of well water should be consistent when combination well excites.
3rd, the energy and frequency of significant wave in earthquake record, individual well medicine are obtained using array length 10m, 3,5,7 wells of experiment
Measure 1-3kg, combination can combine along seismic survey lines dimension linear, can also the areal array centered on the shot point of center,
Combination is shown in Fig. 2, Fig. 3, and left part is along survey line linear combination in wherein Fig. 3, and right part is around central point areal array.
4th, seismic signal is received using multiple geophone, general one group of the 3-10 strings of detector array number, receive wave detector
Using slotting heap it is embedding or along seismic survey lines carry out linear combination, array length 0-5m.
5th, observation system is as Conventional methods of selection.
6th, data processing and interpretation is identical with conventional loess tableland processing means of interpretation.
The above description is merely a specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all be contained
Cover within protection scope of the present invention.Therefore, protection scope of the present invention answers the scope of the claims of being subject to.
Claims (1)
- A kind of 1. big array length shooting on group method of seismic prospecting of loess tableland coal field, using big array length, small pit goaf group Close well and be combined excitation, it is characterised in that step is as follows：Q1:Carry out weathering zone investigation：Determine low, reduction of speed tape thickness, be specifically：Using Bu Deng roads spacing, i.e. reception channel both ends road Spacing is small, and interim orbit spacing is big；Received using reversed profile observation system, zero-offset off-end shooting, the hole of excitation is deep 1m, dose 0.5kg；Wherein, reversed profile observation system is the observation system for carrying out weathering zone investigation：In Bu Deng roads The both ends of spacing excite respectively, are received with the same arrangement i.e. wave detector that receives, obtain two opposite earthquake records of direction, use In explain the point at weathering depth；Sample rate 0.5ms, record length 0.5s, spread length are respectively 90m；Pick up respectively again The first arrival time of the two records, obtains the graph of a relation of a first arrival time and geophone offset, and the speed of each layer of change is calculated With thickness；Q2:Earthquake data acquisition：The selection well depths of 2-3m as shooting on group in reduction of speed band, each well when combination well excites Horizontal absolute altitude is consistent;Individual well dose is 1-3Kg at this time；Promote excitaton source excitation plane ripple, increase the impact to soil-structure interactions； Combination selects a use：Combined along seismic survey lines dimension linear, or the areal array centered on the shot point of center；Q3:Effective wave energy and frequency are analyzed, determines the well number of shooting on group, value range combines for 3-7 excitation well, group Close well array length and be set to 10m；Q4:Seismic signal is received using multiple geophone, 3-5 slotting heaps of wave detector selection are embedding；Q5:Observation system is received using conventional vision systems.
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| CN111435169B (en) * | 2019-01-11 | 2024-02-09 | 中石化石油工程技术服务有限公司 | Splitting excitation method for ultra-combination well in ultra-thick loess highland |
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| CN102778691A (en) * | 2011-05-13 | 2012-11-14 | 中国石油天然气集团公司 | Method for calculating statics correction time difference in detector group |
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| CN103869355A (en) * | 2012-12-18 | 2014-06-18 | 中国石油天然气集团公司 | Method for determining shot point combination |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2434868B (en) * | 2006-02-06 | 2010-05-12 | Statoil Asa | Method of conducting a seismic survey |
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| CN102778691A (en) * | 2011-05-13 | 2012-11-14 | 中国石油天然气集团公司 | Method for calculating statics correction time difference in detector group |
| CN102830424A (en) * | 2012-09-07 | 2012-12-19 | 西南石油大学 | Method for calculating combination parameters of detector |
| CN103869355A (en) * | 2012-12-18 | 2014-06-18 | 中国石油天然气集团公司 | Method for determining shot point combination |
| WO2014197425A1 (en) * | 2013-06-05 | 2014-12-11 | Saudi Arabian Oil Company | Blended land seismic data acquisition employing dispersed source arrays with variable sweep length |
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