CN105372697A - Loess tableland coal mining area large-array-length combined excitation seismic exploration technology - Google Patents
Loess tableland coal mining area large-array-length combined excitation seismic exploration technology Download PDFInfo
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Abstract
The invention provides a loess tableland coal mining area large-array-length combined excitation seismic exploration technology. Combined excitation is carried out by adopting a large-array-length and small-dose combination well on the basis of conventional seismic exploration, so as to effectively enhance the seismic wave energy and suppress the development of interference wave. For a single deep well, the pore forming process is easier, the time for pore forming is short, and the efficiency is high. For small-length combination well excitation, interference suppression is improved markedly, and the record quality is improved obviously. For specific operation personnel, the technology is more operational, easy to promote and easy to implement and has a wide prospect of industrial application.
Description
Technical field
The present invention relates to seismic exploration technique field, particularly relate to a kind of loess tableland coal field large array length shooting on group seismic exploration technique.
Background technology
Utilize the difference of underground medium elasticity and density, by the response of observation and analysis the earth to artificial excitation's seismic event, infer that the geophysical exploration method of the character and form of subterranean strata is called seismic prospecting.Seismic prospecting is the important means of exploration oil and gas resource before probing, in coalfield and engineering geologic investigation, Study on Regional Geology and earth's crust research etc., is also used widely.
Seismic prospecting starts from the middle of the 19th century.1845, R. Ma Lite once measured the velocity of propagation of elastic wave in the earth's crust with the seismic event of artificial excitation.This can be described as the rudiment of method of seismic prospecting.During the World War I, the seismic event that both sides at war once utilized heavy artillery recoil to produce is to determine the emplacement of the other side.Nineteen twenty-one, J.C. card is thorough drops into practical application by seismic reflection method, at the reflection wave clearly that Oklahoma, United States first record produces to artificial earthquake.
China's seismic prospecting starts from 20 middle of century, the seismic prospecting of colliery, Loess Tableland starts from the nineties in 20th century, for overcoming the strong attenuation by absorption effect of the loose loess formation of shallow-layer, the seismic prospecting of colliery, Loess Tableland first adopts single deep-well, large dose excites, after be improved to little array length (0-5m) combination well and excite, its effect has had certain improvement, but also needs significant improvement to disturbance suppression and raising significant wave energy aspect.
Landform, the landforms of the loess tableland uniqueness of China have: plateau, beam, ditch, loess hills, slope, and loess ditch is dendriform distribution, cutting and erosion loess tableland.Loess is loose, dry, and speed changes within the scope of 350-1200m/s, and loess formation thickness is between more than ten rice to hundreds of rice.Extreme terrain and the collapsible loess of Loess Tableland are loosely organized, cause all difficulties to seismic prospecting, as interference wave grow, seismic wave energy is low etc. by attenuation by absorption, geological data signal to noise ratio (S/N ratio), makes Loess Tableland seismic prospecting become a world-class difficult problem.
Summary of the invention
Can efficiently to disturbance suppression and the above-mentioned defect of exploration engineering and the problem that improve significant wave energy for lacking in prior art, the object of the embodiment of the present invention is to provide a kind of loess tableland coal field large array length shooting on group seismic exploration technique, accuracy rate is high, effect is better, for western loess tableland coal field of seismic exploration, effective enhancing seismic wave energy, compacting interference wave is grown, and improves seismologic record quality.
In order to achieve the above object, the embodiment of the present invention provides following technical scheme:
A kind of loess tableland coal field large array length shooting on group seismic exploration technique, adopt large array length, small pit goaf combination well carries out shooting on group, it is characterized in that, step is as follows:
Q1: carry out weathering zone investigation: determine low, reduction of speed tape thickness, implementation method: adopt and do not wait track pitch, namely reception channel two ends track pitch is little, and interim orbit spacing is large; Reversed profile recording geometry is adopted to receive, zero-offset shooting off end, the dark 0.5-1m in the hole excited, dose 0.5-1kg;
Wherein, reversed profile recording geometry is used to the recording geometry of carrying out weathering zone investigation: excite respectively not waiting two ends of track pitch, receiving with same reception arrangement and wave detector, obtaining two seismologic records that direction is contrary, for explaining this some place weathering thickness; Pick up the first break time of these two records more respectively, obtain the graph of a relation of a first break time and geophone offset, calculate speed and the thickness of each layer of change;
Q2: earthquake data acquisition: select in reduction of speed band that 2-3m is as the well depth of shooting on group, when combination well excites, the flat absolute altitude of each well water is consistent; Now individual well dose is 1-3Kg; Impel excitaton source excitation plane ripple, increase the impact to soil-structure interactions,
Q3: analyze significant wave energy and frequency, determine the well number of shooting on group, value range is 3-7 excitation well combination; Combination well array length is decided to be 10m;
Q4: adopt multiple geophone to receive seismic signal, wave detector selects 3-5 slotting heap embedding, or along survey line linear combination, array length 0-5m;
Q5: recording geometry adopts conventional vision systems.
Preferred as technique scheme, design parameter when exciting in described Q1 step is: excite the dark 1m in hole, dose 0.5kg, sampling rate 0.5ms, record length 0.5s, spread length is respectively 90m; First break pickup is carried out to the record obtained, explains low, reduction of speed tape speed and thickness.
Preferred as technique scheme, in described Q2-Q3 step, combination well array mode is along the combination of seismic line dimension linear, or areal array centered by the shot point of center.
A kind of loess tableland coal field large array length shooting on group seismic exploration technique that the embodiment of the present invention provides, the basis of legacy data acquisition technique is innovated, impel excitaton source excitation plane ripple, increase the impact to soil-structure interactions, increase active area, improve penetration capacity, both effectively can suppress random disturbance, and in turn enhance the transmission capacity of seismic event; Compared with prior art, on the basis of common seismic exploration, adopt large array length, small pit goaf combination well carries out shooting on group, effective enhancing seismic wave energy, compacting interference wave is grown, and for single deep-well, pore forming process more easily, the pore-forming time is short, efficiency is high; For little cardinal distance combination well excites, have clear improvement to the compacting of interference, record quality significantly improves; Concerning concrete operations personnel, operability is stronger, is easy to promote, and is easy to realize, has very wide prospects for commercial application.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the weathering zone investigation work arrangement schematic diagram of a kind of loess tableland coal field large array length shooting on group seismic exploration technique of the embodiment of the present invention.
Fig. 2 is that 7 well linear combinations of a kind of loess tableland coal field large array length shooting on group seismic exploration technique of the embodiment of the present invention excite schematic diagram.
Fig. 3 is the excitation well array mode schematic diagram of a kind of loess tableland coal field large array length shooting on group seismic exploration technique of the embodiment of the present invention.
Fig. 4 is the seismologic record schematic diagram carrying out exciting when weathering zone is investigated acquisition of a kind of loess tableland coal field large array length shooting on group seismic exploration technique of the embodiment of the present invention.
Embodiment
Be clearly and completely described technical scheme of the present invention below, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
1, carry out weathering zone investigation and determine shooting depth.Adopt and do not wait track pitch (broad in the middle, two is little) reversed profile recording geometry, zero-offset shooting off end, 24 roads receive; Excite the dark 1m in hole, dose 0.5kg, sampling rate 0.5ms, record length 0.5s, spread length is respectively 90m, sees Fig. 1.First break pickup is carried out to the record obtained, explains low, reduction of speed tape speed and thickness.
The explanation of reversed profile recording geometry: in identical extended spread, see Fig. 1, its reception channel two ends track pitch is little, interim orbit spacing is large, excite respectively at two ends, same reception arrangement (grey wave detector) receives, and obtains two contrary seismologic records of direction as Fig. 4, for explaining this some place weathering thickness., pick up the first break time of these two records respectively, obtain the graph of a relation of a first break time and geophone offset, calculate speed and the thickness of each layer of change.
2, in selection reduction of speed band, 2-3m is as shooting depth, and when combination well excites, the flat absolute altitude of each well water should be consistent.
3, array length 10m is adopted, test 3,5,7 wells obtain energy and the frequency of significant wave on seismologic record, individual well dose 1-3kg, array mode can combine along seismic line dimension linear, also can areal array centered by the shot point of center, array mode is shown in Fig. 2, Fig. 3, and wherein in Fig. 3, left part is along survey line linear combination, and right part is around central point areal array.
4, adopt multiple geophone to receive seismic signal, the general 3-10 of receiver pattern number goes here and there one group, and the slotting heap of reception wave detector employing is embedding or carry out linear combination along seismic line, array length 0-5m.
5, recording geometry is the same with Conventional methods of selection.
6, data processing and interpretation is identical with conventional loess tableland process interpretation procedure.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should described be as the criterion with the protection domain of claim.
Claims (4)
1. a loess tableland coal field large array length shooting on group seismic exploration technique, adopt large array length, small pit goaf combination well carries out shooting on group, it is characterized in that, step is as follows:
Q1: carry out weathering zone investigation: determine low, reduction of speed tape thickness, implementation method: adopt and do not wait track pitch, namely reception channel two ends track pitch is little, and interim orbit spacing is large; Reversed profile recording geometry is adopted to receive, zero-offset shooting off end, the dark 0.5-1m in the hole excited, dose 0.5-1kg;
Wherein, reversed profile recording geometry is used to the recording geometry of carrying out weathering zone investigation: excite respectively not waiting two ends of track pitch, receiving with same reception arrangement and wave detector, obtaining two seismologic records that direction is contrary, for explaining this some place weathering thickness; Pick up the first break time of these two records more respectively, obtain the graph of a relation of a first break time and geophone offset, calculate speed and the thickness of each layer of change;
Q2: earthquake data acquisition: select in reduction of speed band that 2-3m is as the well depth of shooting on group, when combination well excites, the flat absolute altitude of each well water is consistent; Now individual well dose is 1-3Kg; Impel excitaton source excitation plane ripple, increase the impact to soil-structure interactions;
Q3: analyze significant wave energy and frequency, determine the well number of shooting on group, value range is 3-7 excitation well combination; Combination well array length is decided to be 10m;
Q4: adopt multiple geophone to receive seismic signal, wave detector selects 3-5 slotting heap embedding, or along survey line linear combination, array length 0-5m;
Q5: recording geometry adopts conventional vision systems.
2. a kind of loess tableland coal field according to claim 1 large array length shooting on group seismic exploration technique, is characterized in that, design parameter when exciting in described Q1 step is: excite the dark 1m in hole, dose 0.5kg, sampling rate 0.5ms, record length 0.5s, spread length is respectively 90m; First break pickup is carried out to the record obtained, explains low, reduction of speed tape speed and thickness.
3. a kind of loess tableland coal field according to claim 1 large array length shooting on group seismic exploration technique, it is characterized in that, in described Q2 step, combination well array mode is along the combination of seismic line dimension linear, or areal array centered by the shot point of center.
4. a kind of loess tableland coal field according to claim 1 large array length shooting on group seismic exploration technique, it is characterized in that, step is as follows:
Q1: carry out weathering zone investigation and determine shooting depth, adopt and do not wait track pitch reversed profile recording geometry, zero-offset shooting off end, 24 roads receive; Excite the dark 1m in hole, dose 0.5kg, sampling rate 0.5ms, record length 0.5s, spread length is respectively 90m; First break pickup is carried out to the record obtained, explains low, reduction of speed tape speed and thickness; In selection reduction of speed band, 2-3m is as shooting depth, and when combination well excites, the flat absolute altitude of each well water should be consistent;
Q2: adopt array length 10m, chooses energy and frequency that combination well institute obtains significant wave on seismologic record, individual well dose 1-3kg, and array mode is combine along seismic line dimension linear, or areal array centered by the shot point of center;
Q3: adopt multiple geophone to receive seismic signal, receiver pattern number goes here and there one group with 3-10, the slotting heap of reception wave detector employing is embedding or carry out linear combination along seismic line, array length 1-5m;
Q4: recording geometry is the same with Conventional methods of selection;
Q5: data processing and interpretation is identical with conventional loess tableland process interpretation procedure.
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| CN111435169A (en) * | 2019-01-11 | 2020-07-21 | 中石化石油工程技术服务有限公司 | Ultra-multi combination well splitting and excitation method for ultra-thick loess highland |
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