CN112444844A - Method for reducing influence of aliasing interference single shot record on target layer imaging - Google Patents
Method for reducing influence of aliasing interference single shot record on target layer imaging Download PDFInfo
- Publication number
- CN112444844A CN112444844A CN201910817473.3A CN201910817473A CN112444844A CN 112444844 A CN112444844 A CN 112444844A CN 201910817473 A CN201910817473 A CN 201910817473A CN 112444844 A CN112444844 A CN 112444844A
- Authority
- CN
- China
- Prior art keywords
- single shot
- scanning signal
- independent
- scanning
- aliasing interference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004088 simulation Methods 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims description 7
- 238000011160 research Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 230000002452 interceptive effect Effects 0.000 claims 2
- 238000012360 testing method Methods 0.000 abstract description 2
- 230000000875 corresponding effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/02—Generating seismic energy
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/24—Recording seismic data
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. analysis, for interpretation, for correction
- G01V1/282—Application of seismic models, synthetic seismograms
Abstract
The invention provides a method for reducing the influence of aliasing interference single shot records on target layer imaging, which utilizes a forward simulation method to analyze the influence of signals with different scanning lengths on the aliasing interference single shot records, and then selects a proper independent scanning signal for independent scanning production of a controllable seismic source according to the influence of the aliasing interference single shot records on effective signals, and the method comprises the following steps: establishing n independent scanning signal pairs S and S1, S and S2, …, S and Sn, and respectively performing forward modeling on each independent scanning signal pair to obtain a plurality of independent scanning single shots with aliasing interference single shot records; analyzing the influence degree of the aliasing interference single shot record energy on the effective wave, and taking the independent scanning signal pair corresponding to the aliasing interference single shot record energy with the minimum influence degree as the optimal independent scanning signal for independent scanning production of the controllable seismic source. The method provided by the invention does not need to determine the independent scanning signal through a specific test, thereby saving manpower and material resources.
Description
Technical Field
The invention relates to a method for reducing the influence of aliasing interference single shot records on target stratum imaging, and belongs to the field of oil and gas geophysical exploration.
Background
The vibroseis high-efficiency acquisition technology is a hotspot of research on the conventional vibroseis acquisition technology, and due to the high production efficiency, the high density of shot points is realized to improve the final imaging effect, but the influence is large in interference, and how to optimally suppress the interference of aliasing interference on single shot records is a research focus.
Independent scanning refers to completely independent and autonomous scanning by exciting a signal of the independent scanning without considering the influence of other seismic sources and the sequence among the seismic sources. The core of the independent scanning technology is how to suppress the influence of aliasing interference on the single shot record to the maximum extent, thereby improving the final imaging effect. Independent scanning requires that the signal correlation among all seismic sources for production is minimum, so that correlation is carried out after a single shot is obtained, and the energy of interference of adjacent shots can be reduced to the minimum, so that how to determine a proper independent scanning signal is the key for reducing the influence of aliasing interference single shot records on a target imaging layer. In the past, the independent scanning signals are determined through specific experiments, and the input manpower and material resources are large.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for reducing the influence of aliasing interference single shot records on target layer imaging, wherein the influence of signals with different scanning lengths on the aliasing interference single shot records is analyzed by using a forward simulation method, and then a proper independent scanning signal is selected for independent scanning production of a controllable seismic source according to the influence of the aliasing interference single shot records on effective signals, so that the influence of the aliasing interference single shot records on the target layer imaging is reduced.
The invention provides a method for reducing the influence of aliasing interference single shot records on target layer imaging, which comprises the following steps:
step a: establishing n independent scanning signal pairs, wherein the n independent scanning signal pairs are S and S1, S and S2, …, S and Sn respectively, S is an initial scanning signal, S1, S2, … and Sn are a1 st scanning signal, a2 nd scanning signal, … and an nth scanning signal respectively, and the scanning lengths of the S and S1, the S2, the S … and the Sn are all different;
step b: forward modeling is carried out on each independent scanning signal pair respectively to obtain a plurality of independent scanning single shots with aliasing interference single shot records;
step c: analyzing the influence degree of the aliasing interference single shot record energy on the effective wave, and taking the independent scanning signal pair corresponding to the aliasing interference single shot record energy with the minimum influence degree as an optimal independent scanning signal for independent scanning production of a vibroseis so as to reduce the influence of the aliasing interference single shot record on the target layer imaging;
wherein n is a natural number.
Preferably, the step a includes:
step a 1: establishing an initial scanning signal S according to known conditions;
step a 2: changing the scan length of the initial scan signal S a plurality of times to obtain the 1 st scan signal S1, the 2 nd scan signals S2, …, and the nth scan signal Sn, respectively, pairing S with S1, S2, …, and Sn, respectively, to obtain a plurality of pairs of n independent scan signal pairs excited simultaneously, the n independent scan signal pairs being S and S1, S and S2, …, S and Sn, respectively, wherein the n independent scan signal pairs can be excited simultaneously. Preferably, the step b includes:
step b 1: on a two-dimensional geological model of a research area, forward modeling is carried out on each pair of independent scanning signals S and S1, S and S2, …, S and Sn respectively to obtain a plurality of corresponding simulation mother records;
step b 2: and (4) correlating each simulated mother record by using an initial scanning signal S to obtain a plurality of independent scanning single cannons with aliasing interference single cannon records.
Preferably, the S and S1, S2, … and Sn are the same except that the scan length is different.
Preferably, the scan lengths of S, S1, S2, …, Sn may be combined into an arithmetic progression.
Preferably, the parameters of the initial scanning signal S include a scanning frequency, a scanning length, a force magnitude and a ramp length.
Preferably, the two-dimensional geological model comprises velocity, depth and formation information of the geological model.
Preferably, the known conditions include geological mission requirements and surface construction conditions.
Compared with the prior art, the method utilizes a forward modeling method to analyze the influence of signals with different scanning lengths on aliasing interference single shot records, and then selects a proper independent scanning signal for independent scanning production of the controllable seismic source according to the influence of the aliasing interference single shot records on effective signals, so that the influence of the aliasing interference single shot records on target layer imaging is reduced. The method does not need to determine the independent scanning signals through a specific test to reduce the influence of aliasing interference on target layer imaging by the single shot record, and saves manpower and material resources.
The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.
Drawings
The invention will be described in more detail hereinafter on the basis of non-limiting examples only and with reference to the accompanying drawings. Wherein:
FIG. 1 is a schematic flow chart diagram of a method of reducing the effect of aliasing interference single shot records on target layer imaging according to the invention;
fig. 2 is a single shot diagram of different scan lengths in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and more complete, the following technical solutions of the present invention will be described in detail, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the specific embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 1, the method for reducing the influence of aliasing interference single shot records on target layer imaging comprises the following steps:
step S101: designing an initial scanning signal S according to geological task requirements and surface construction conditions;
step S102: changing the scan length of the initial scan signal S a plurality of times to obtain the 1 st scan signal S1, the 2 nd scan signals S2, …, and the nth scan signal Sn, respectively, pairing S with S1, S2, …, and Sn, respectively, to obtain n independent scan signal pairs, S and S1, S and S2, …, S and Sn, respectively, wherein the n independent scan signal pairs can be activated simultaneously;
step S103: establishing a two-dimensional geological model of the research area according to the geological structure of the research area;
step S104: on a two-dimensional geological model of a research area, forward modeling is carried out on each pair of independent scanning signals S and S1, S and S2, …, S and Sn respectively to obtain a plurality of corresponding simulation mother records;
step S105: correlating each analog mother record by using an initial scanning signal S to obtain a plurality of independent scanning single cannons with aliasing interference single cannon records;
step S106: analyzing the influence degree of the aliasing interference single shot record energy on the effective wave, and taking the independent scanning signal pair corresponding to the aliasing interference single shot record energy with the minimum influence degree as the optimal independent scanning signal for independent scanning production of the controllable seismic source so as to reduce the influence of the aliasing interference single shot record on the target layer imaging.
In the above scheme, the parameters of the initial scanning signal may include a scanning frequency, a scanning length, a force output magnitude, a ramp length, and the like; the two-dimensional geological model comprises speed, depth and structural information of the geological model; the study area is the area in which independent scanning of the vibroseis is to be performed.
Independent scanning signals composed of Sn and S are adopted to simultaneously carry out independent scanning simulation on a two-dimensional geological model, simulation mother records obtained through simulation and S are subjected to correlation operation to obtain a single shot, two single shot records can be obtained in the single shot, one single shot record is obtained by correlating the S mother record and the S, the other single shot record is aliasing interference single shot record obtained by correlating the Sn mother record and the S, the aliasing interference record has certain energy, the influence degree of the aliasing interference single shot energy on effective waves is analyzed, the independent scanning signal pair corresponding to the aliasing interference single shot energy with the minimum influence degree is used as the optimal independent scanning signal for independently scanning and producing the controllable seismic source, and the influence of the aliasing interference single shot record on target layer imaging is reduced.
Based on the above scheme, a preferable scheme is that the length of the initial scanning signal and the scanning length of the second scanning signal can form an arithmetic progression, so that the design is more favorable for reasonably obtaining the optimal scanning parameters.
The first embodiment is as follows:
a reasonable initial scanning signal is designed according to the requirements of a certain geological task and the surface construction conditions, the initial scanning signal is a linear scanning signal, the frequency is 4-83Hz, the scanning length is 20s, the slope is 500ms, and the output is 70%.
And establishing a two-dimensional geological model according to the geological structure of the independent scanning area of the controllable seismic source to be implemented, and providing a foundation for forward simulation.
Marking the initial scanning signal as S, based on the initial scanning signal, only changing the scanning length of the initial scanning signal to obtain a1 st scanning signal with a scanning length of 10S, a2 nd scanning signal with a scanning length of 11S, a 3 rd scanning signal with a scanning length of 12S, a 4 th scanning signal with a scanning length of 13S, a 5 th scanning signal with a scanning length of 14S, a 6 th scanning signal with a scanning length of 15S, a 7 th scanning signal with a scanning length of 16S, an 8 th scanning signal with a scanning length of 17S, a 9 th scanning signal with a scanning length of 18S and a 10 th scanning signal with a scanning length of 19S, and the 1 st scanning signal and the 2 nd scanning signal … … are marked as S1, S2 and … S10 in turn, and S, S1 and S2 … S10 are respectively combined into 10 pairs of independent scanning signals which are simultaneously excited for forward simulation.
On the two-dimensional geological model established in the foregoing, forward modeling is performed on the independent scanning signals by using the 10 pairs, and 10 simulated mother records are obtained.
The obtained 10 scanning signals S for master recording are correlated to obtain 10 independent scanning single shots with aliasing interference single shot records, as shown in fig. 2, a single shot of an initial scanning signal with a scanning length of 20S is used as a production shot, single shots with different scanning lengths of S1 and S2 … S10 are used as aliasing interference single shot records, and as can be seen from a single shot simulation effect, aliasing interference single shot record energy in the 10 single shots is gradually weakened, and by analyzing the influence degree of the size of the aliasing interference single shot energy on an effective wave, the independent scanning signal pair S and S6 corresponding to the aliasing interference single shot record energy with the smallest influence degree are used as independent scanning signals for independently scanning and producing the controllable seismic source.
Finally, it should be noted that: the above embodiments and examples are only used to illustrate the technical solution of the present invention, but not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments and examples, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments or examples may still be modified, or some of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments or examples of the present invention.
Claims (8)
1. A method for reducing the effects of aliasing interfering single shot records on target layer imaging, the method comprising the steps of:
step a: establishing n independent scanning signal pairs, wherein the n independent scanning signal pairs are S and S1, S and S2, …, S and Sn respectively, S is an initial scanning signal, S1, S2, … and Sn are a1 st scanning signal, a2 nd scanning signal, … and an nth scanning signal respectively, and the scanning lengths of the S and S1, the S2, the S … and the Sn are all different;
step b: forward modeling is carried out on each independent scanning signal pair respectively to obtain a plurality of independent scanning single shots with aliasing interference single shot records;
step c: analyzing the influence degree of the aliasing interference single shot record energy on the effective wave, and taking the independent scanning signal pair corresponding to the aliasing interference single shot record energy with the minimum influence degree as an optimal independent scanning signal for independent scanning production of a vibroseis so as to reduce the influence of the aliasing interference single shot record on the target layer imaging;
wherein n is a natural number.
2. The method for reducing the influence of aliasing interference single shot records on target layer imaging according to claim 1, wherein the step a comprises:
step a 1: establishing an initial scanning signal S according to known conditions;
step a 2: changing the scan length of the initial scan signal S a plurality of times to obtain the 1 st scan signal S1, the 2 nd scan signals S2, …, and the nth scan signal Sn, respectively, pairing S with S1, S2, …, and Sn, respectively, to obtain n independent scan signal pairs, S and S1, S and S2, …, S and Sn, respectively, wherein the n independent scan signal pairs can be activated simultaneously.
3. The method for reducing the effect of aliasing interference single shot records on target layer imaging according to claim 1, wherein the step b comprises:
step b 1: on a two-dimensional geological model of a research area, forward modeling is carried out on each pair of independent scanning signals S and S1, S and S2, …, S and Sn respectively to obtain a plurality of corresponding simulation mother records;
step b 2: and (4) correlating each simulated mother record by using an initial scanning signal S to obtain a plurality of independent scanning single cannons with aliasing interference single cannon records.
4. The method for reducing the influence of aliasing interference on target layer imaging by single shot records according to any one of claims 1-3, wherein the parameters of S and S1, S2, … and Sn are the same except that the scan length is different.
5. The method for reducing the effect of aliasing interference single shot records on target layer imaging according to claim 4, wherein the scan lengths of S, S1, S2, …, Sn can be combined into an arithmetic series.
6. A method for reducing the impact of aliasing interference single shot records on target layer imaging according to any one of claims 1-3, characterized in that the parameters of the initial scanning signal S comprise scanning frequency, scanning length, force magnitude and ramp length.
7. The method of reducing the impact of aliasing interference single shot records on target layer imaging according to claim 3, wherein the two-dimensional geological model comprises velocity, depth and formation information of the geological model.
8. The method of reducing the impact of aliasing interfering single shot records on target layer imaging according to claim 2, wherein the known conditions comprise geological mission requirements and surface construction conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910817473.3A CN112444844A (en) | 2019-08-30 | 2019-08-30 | Method for reducing influence of aliasing interference single shot record on target layer imaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910817473.3A CN112444844A (en) | 2019-08-30 | 2019-08-30 | Method for reducing influence of aliasing interference single shot record on target layer imaging |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112444844A true CN112444844A (en) | 2021-03-05 |
Family
ID=74734488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910817473.3A Pending CN112444844A (en) | 2019-08-30 | 2019-08-30 | Method for reducing influence of aliasing interference single shot record on target layer imaging |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112444844A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5189644A (en) * | 1992-02-04 | 1993-02-23 | Wood Lawrence C | Removal of amplitude aliasing effect from seismic data |
| GB0805341D0 (en) * | 2008-03-25 | 2008-04-30 | Geco Technology Bv | Noise attenuation of seismic data |
| US20140269183A1 (en) * | 2013-03-14 | 2014-09-18 | Pgs Geophysical As | Systems and methods for frequency-domain filtering and space-time domain discrimination of seismic data |
| CN104216010A (en) * | 2013-06-05 | 2014-12-17 | 上海青凤致远地球物理地质勘探科技有限公司 | Method for increasing quality of seismic data by using harmonic waves of controllable seismic focus |
| CN108549106A (en) * | 2018-03-09 | 2018-09-18 | 中国石油天然气集团有限公司 | Aliasing noise drawing method and device |
| CN108801251A (en) * | 2018-06-12 | 2018-11-13 | 中国科学院光电技术研究所 | A kind of inertial sensor aliasing interference signal separation method |
| CN109471171A (en) * | 2018-09-21 | 2019-03-15 | 中国石油天然气集团有限公司 | A kind of method, apparatus and system of aliased seismic data separation |
-
2019
- 2019-08-30 CN CN201910817473.3A patent/CN112444844A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5189644A (en) * | 1992-02-04 | 1993-02-23 | Wood Lawrence C | Removal of amplitude aliasing effect from seismic data |
| GB0805341D0 (en) * | 2008-03-25 | 2008-04-30 | Geco Technology Bv | Noise attenuation of seismic data |
| GB2458642A (en) * | 2008-03-25 | 2009-09-30 | Geco Technology Bv | Noise attenuation of seismic data |
| US20140269183A1 (en) * | 2013-03-14 | 2014-09-18 | Pgs Geophysical As | Systems and methods for frequency-domain filtering and space-time domain discrimination of seismic data |
| CN104216010A (en) * | 2013-06-05 | 2014-12-17 | 上海青凤致远地球物理地质勘探科技有限公司 | Method for increasing quality of seismic data by using harmonic waves of controllable seismic focus |
| CN108549106A (en) * | 2018-03-09 | 2018-09-18 | 中国石油天然气集团有限公司 | Aliasing noise drawing method and device |
| CN108801251A (en) * | 2018-06-12 | 2018-11-13 | 中国科学院光电技术研究所 | A kind of inertial sensor aliasing interference signal separation method |
| CN109471171A (en) * | 2018-09-21 | 2019-03-15 | 中国石油天然气集团有限公司 | A kind of method, apparatus and system of aliased seismic data separation |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102928873B (en) | Method for positioning ground micro-seismic based on four-dimensional energy focusing | |
| EA200700634A1 (en) | METHOD OF MODELING THE GEOLOGICAL ENVIRONMENT AND CONSTRUCTION OF SEISMIC IMAGES USING AN ITERATIVE AND ELECTORAL UPDATE | |
| CN107505654A (en) | Full waveform inversion method based on earthquake record integration | |
| CN105093319B (en) | Ground micro-seismic static correcting method based on 3D seismic data | |
| CA2833308C (en) | Continuous seismic acquisition | |
| CN114839673B (en) | Separation method, separation system and computer equipment for multi-seismic-source efficient acquisition wave field | |
| CN103984012A (en) | Diffracted wave field separation method based on pre-stack gaussian beam depth migration | |
| CN106154330B (en) | Electromagnetic type controlled source parabolic Radon transform suppresses parallel focus crosstalk noise method | |
| CN103439738A (en) | Identification method for seismic exploration single-shot record abnormal channels | |
| CN103885085A (en) | Method for suppressing controllable epicenter harmonic wave interference | |
| CN102798894A (en) | Sliding scanning harmonic suppression method based on sparse inversion | |
| CN107765308A (en) | Reconstruct low-frequency data frequency domain full waveform inversion method based on convolution thought Yu accurate focus | |
| CN105607119B (en) | Near-surface model construction method and static correction value acquiring method | |
| CN106353798A (en) | Multi-component joint Gaussian beam pre-stack reverse-time migration imaging method | |
| CN112444844A (en) | Method for reducing influence of aliasing interference single shot record on target layer imaging | |
| CN102540254A (en) | Method for determining effective excitation region based on lighting analysis | |
| CN113534259A (en) | Vibroseis efficient acquisition real-time prestack time migration imaging method | |
| CN104133249A (en) | Method and device for interpreting micro-logging information and acoustic logging information in united mode | |
| CN104199105A (en) | Pickup method and device of first arrivals in high-density three-dimensional exploration | |
| CN107831533A (en) | Acquisition scheme geophone arrangement quantitative-length analysis method based on energy statisticses | |
| CN111158050A (en) | Data acquisition system and method and tunnel seismic wave advanced prediction method | |
| CN109270576A (en) | Multichannel three-dimensional seismic physical simulation collecting method and device | |
| CN110895349A (en) | Design method of independent scanning signal based on median filtering processing requirement | |
| CN103454675A (en) | Wave field separation processing method eliminating random disturbance and based on instrument channel numbers | |
| CN104280766B (en) | A kind of direct offset method of utilization local data lineups slope |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |