CN105527649B - A kind of more focus blended data separation methods of the highly effective gathering of multiple domain separating for several times - Google Patents

Abstract

The invention discloses a multi-domain multi-separation high-efficiency acquisition multi-source mixed data separation method, which relates to the field of geophysics. The invention is invented to solve the problem of poor separation quality in the prior art, which leads to poor migration imaging results using conventional methods. Including: obtaining time-domain aliased two-dimensional shot records m; obtaining common center point gather b of aliased data; obtaining separated effective signal S and separated adjacent shot interference N; obtaining separated effective signal S after gather conversion ' and the separated adjacent shot jamming N' after gather conversion; obtain the leaked effective signal NS in the separated adjacent shot jamming, the purified adjacent shot jamming NN in the separated adjacent shot jamming, and the purified effective signal in the separated effective signal SS and the residual adjacent-cannon interference SN in the separated effective signal; correspondingly recombined to construct the final separated effective signal S1 and the final separated adjacent-cannon interference N1.

Description

A high-efficiency acquisition and multi-source hybrid data separation method for multi-domain and multiple separation

technical field

The invention relates to the field of geophysics, in particular to a multi-domain multi-separation high-efficiency acquisition multi-source mixed data separation method.

Background technique

At present, the separation method of multi-source mixed data collected in large-scale industrial applications in China is mainly to filter and denoise the common offset gathers of pseudo-separated gathers to obtain separated data.

However, since the above process exploits the statistical properties of the effective signal to suppress aliasing noise, the poor quality of data separation for multi-source aliased data with low aliased SNR leads to migration imaging using conventional methods. results are poor.

Contents of the invention

The invention provides a multi-domain multi-separation high-efficiency acquisition multi-source mixed data separation method, which can remove the influence of aliasing noise and improve the quality of data separation.

The present invention solves the technical problem by adopting the following technical scheme: a method for efficiently collecting multi-source mixed data with multi-domain multiple separation, including: S10, obtaining the two-dimensional shot record m of time domain aliasing; S20, according to the two-dimensional Shot record m and the preset conversion function Ψ from the common shot point gather to the common center point gather, and obtain the aliasing data in the common center point gather b; S30, according to the preset consistency filter П and the aliasing Obtain the separated effective signal S and the separated adjacent-shot interference N in the common central point gather b of the stacked data; The interference N is respectively converted into the common shot point gather, and the effective signal S' separated after the gather conversion and the adjacent shot interference N' separated after the gather conversion are obtained; S50, according to the effective signal S' separated after the gather conversion and the separated adjacent shot jamming N' after the gather conversion, respectively obtain the leaked effective signal NS in the separated adjacent shot jamming, the purified adjacent shot jamming NN in the separated adjacent shot jamming, and the purified effective signal SS in the separated effective signal And the residual adjacent shot interference SN in the separated effective signal; S60, according to the effective signal NS leaked in the separated adjacent shot interference, the adjacent shot interference NN purified in the separated adjacent shot interference, and the purified adjacent shot interference NN in the separated effective signal The effective signal SS and the residual adjacent-shot interference SN in the separated effective signal are correspondingly recombined to construct the final separated effective signal S1 and the final separated adjacent-shot interference N1.

Optionally, in the high-efficiency acquisition multi-source hybrid data separation method provided by the embodiment of the present invention, the S20 includes: multiplying the two-dimensional shot record m by the conversion function Ψ to obtain the The aliased data is in the common midpoint gather b.

Optionally, in the multi-domain multi-separation high-efficiency acquisition multi-source hybrid data separation method provided by the embodiment of the present invention, the S30 includes S301, multiplying the preset consistency filter П by the aliasing data In the common center point gather b, obtain the separated effective signal S; S302, subtract the separated effective signal S from the aliased data in the common center point gather b, to obtain the separated adjacent shot interference N.

Optionally, in the multi-domain multi-separation high-efficiency acquisition multi-source hybrid data separation method provided by the embodiment of the present invention, the S40 includes: S401, according to the conversion function Ψ, obtain the data from the common center point gather to the common shot The transfer function Ψ ^T of the point gather; S402. Multiply the transfer function Ψ ^T by the separated effective signal S to obtain the separated effective signal S' after gather conversion; S403. Multiply the transfer function Ψ ^T Using the separated adjacent shot interference N, the separated adjacent shot interference N' after gather conversion is obtained.

Optionally, in the multi-domain multi-separation high-efficiency acquisition multi-source hybrid data separation method provided by the embodiment of the present invention, the S50 includes: S501, multiplying the preset consistency filter П by the gather Converting the separated adjacent-shot interference N' to obtain the purified adjacent-shot interference NN in the separated adjacent-shot interference; S502, subtracting the separated adjacent-shot interference N' from the converted gather The adjacent shot interference NN purified in the jamming is obtained from the separated effective signal NS leaked in the adjacent shot jamming; S503, multiplying the preset consistency filter П by the separated effective signal S' after the gather conversion , obtain the purified effective signal SS in the separated effective signal; S504, subtract the purified effective signal SS in the separated effective signal from the separated effective signal S' after the gather conversion, and obtain the separated Neighboring guns remaining in the effective signal interfere with the SN.

Optionally, in the multi-domain multi-separation high-efficiency acquisition and multi-source hybrid data separation method provided by the embodiment of the present invention, the S60 includes: S601, adding the purified effective signal SS to the separated effective signal The effective signal NS leaked in the separated adjacent-shot jamming is obtained to obtain the final separated effective signal S1; S602, adding the adjacent-shot jamming SN remaining in the separated effective signal to the purified adjacent-shot jamming The cannon interferes with NN, and the adjacent cannon interferes with N1 which is finally separated.

Optionally, in the multi-domain multi-separation high-efficiency acquisition multi-source hybrid data separation method provided by the embodiment of the present invention, the consistency filter is a multi-dimensional vector median consistency filter.

The present invention has the following beneficial effects: the influence of aliasing noise can be removed by means of multi-domain multiple separation, and the quality of data separation can be improved; the above process can provide data for migration imaging using conventional seismic methods, and improve the quality of migration . The technical solution provided by the embodiment of the present invention solves the problem that the prior art utilizes the statistical characteristics of the effective signal to suppress the aliasing noise. Therefore, the quality of data separation is relatively low for multi-source aliasing shot data with a relatively low aliasing signal-to-noise ratio. Poor, which in turn leads to poor results of migration imaging using conventional methods.

Description of drawings

Fig. 1 is the flow chart of the efficient acquisition and multi-source mixed data separation method of multi-domain multiple separation provided by Embodiment 1 of the present invention;

Fig. 2 is the schematic diagram of the two-dimensional shot record in the high-efficiency acquisition multi-source hybrid data separation method of multi-domain multiple separation shown in Fig. 1;

Fig. 3 is a schematic diagram of the aliasing data in the common center point gather b in the high-efficiency acquisition multi-source hybrid data separation method of multi-domain multiple separation shown in Fig. 1;

Fig. 4 is the schematic diagram of the effective signal S separated in the high-efficiency acquisition multi-source hybrid data separation method of multi-domain multiple separation shown in Fig. 1;

Fig. 5 is a schematic diagram of the adjacent shot interference N separated in the efficient acquisition multi-source hybrid data separation method of multi-domain multiple separation shown in Fig. 1;

Fig. 6 is a schematic diagram of the effective signal S' in the common shot point gather after gather conversion in the high-efficiency acquisition multi-source hybrid data separation method of multi-domain multiple separation shown in Fig. 1;

Fig. 7 is a schematic diagram of adjacent shot interference N' in the common shot point gather after gather conversion in the high-efficiency acquisition multi-source hybrid data separation method of multi-domain multiple separation shown in Fig. 1;

Fig. 8 is a schematic diagram of the effective signal S1 finally separated in the high-efficiency acquisition multi-source hybrid data separation method of multi-domain multiple separation shown in Fig. 1;

FIG. 9 is a schematic diagram of adjacent shot interference N1 reconstructed in the high-efficiency acquisition multi-source hybrid data separation method shown in FIG. 1 .

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the embodiments and the accompanying drawings.

Example 1

As shown in Figure 1, the multi-domain multi-separation high-efficiency acquisition and multi-source hybrid data separation method provided by the embodiment of the present invention includes:

Step 101, acquire time-domain aliased 2D shot records m.

Step 102, according to the 2D shot records m and the preset conversion function Ψ from the common shot gathers to the common central point gathers, obtain the aliased data at the common central point gather b.

Wherein, the process of obtaining the common center point gather b through step 102 includes: multiplying the two-dimensional shot record m by the conversion function Ψ to obtain the common center point gather b of the aliasing data.

That is, the gather of aliased data at the common center point b=Ψm Formula 1

Step 103, according to the preset consistency filter П and the aliasing data, the separated effective signal S and the separated adjacent shot interference N are obtained in the common center point gather b.

Wherein, the process of obtaining the separated effective signal S and the separated adjacent shot interference N through step 103 includes: multiplying the preset consistency filter П by the common center point gather b of the aliasing data to obtain the separated Effective signal S: subtracting the separated effective signal S from the aliased data in the common center point gather b to obtain the separated adjacent shot interference N. The consistency filter may be a consistency filter, specifically, a multi-dimensional vector median consistency filter.

That is, the separated effective signal S=Πb Formula 2

Separate adjacent gun jamming N=b-S

Step 104, according to the transfer function Ψ of the common center point gather, the separated effective signal S and the separated adjacent shot interference N are respectively converted into the common shot point gather, and the separated effective signal S' after gather conversion is obtained and adjacent shot interference N' separated after gather conversion.

In this embodiment, the process of obtaining the effective signal S' separated after the gather conversion and the adjacent shot interference N' separated after the gather conversion through step 104 includes: according to the conversion function Ψ, obtaining the gather from the common center point to The transfer function Ψ ^T of the common shot point gather; the transfer function Ψ ^T is multiplied by the separated effective signal S to obtain the separated effective signal S' after gather conversion; the transfer function Ψ ^T is multiplied by the The separated adjacent-shot interference N is obtained, and the separated adjacent-shot interference N' after gather conversion is obtained.

That is, the effective signal separated after gather conversion S′=Ψ ^T S Equation 3

Neighboring shot interference N′=Ψ ^T N separated after gather conversion

Step 105, according to the effective signal S' separated after the gather conversion and the adjacent shot interference N' separated after the gather conversion, respectively obtain the effective signal NS leaked in the separated adjacent shot interference, and the separated adjacent shot interference N' The adjacent shot interference NN and the purified effective signal SS in the separated effective signal and the residual adjacent shot interference SN in the separated effective signal.

In this embodiment, the process of obtaining NS, NN, SS, and SN through step 105 includes: multiplying the preset consistency filter П by the separated adjacent shot interference N' after the gather conversion, to obtain the separated Neighboring shot jamming NN purified in the adjacent shot jamming; subtracting the adjacent shot jamming NN purified in the separated adjacent shot jamming from the separated adjacent shot jamming N' after gather conversion, to obtain the effective leakage of the separated adjacent shot jamming signal NS; multiply the preset consistency filter П by the effective signal S' separated after the transform of the gather, and obtain the effective signal SS purified from the separated effective signal; separate the transformed gather Subtract the purified effective signal SS from the separated effective signal S' from the effective signal S' to obtain the residual adjacent shot interference SN.

The purified adjacent gun jamming in the separated adjacent gun jamming NN=ΠN′

The effective signal leaked in the separated adjacent gun jamming NS=N'-NN

which is

The effective signal SS=ΠS' purified in the separated effective signal

The remaining adjacent shot interference in the separated effective signal SN=S′-SS Equation 4

Step 106, according to the effective signal NS leaked in the separated adjacent shot jamming, the adjacent shot jamming NN purified in the separated adjacent shot jamming, the purified effective signal SS in the separated effective signal, and the remaining neighbors in the separated effective signal The cannon jamming SN corresponds to the recombination to construct the final separated effective signal S1 and the final separated adjacent cannon jamming N1.

In this embodiment, the process of obtaining the final separated effective signal S1 and the final separated adjacent artillery interference N1 through step 106 includes: adding the separated effective signal SS to the separated adjacent artillery interference The effective signal NS leaked in the leaked effective signal to obtain the final separated effective signal S1; the residual adjacent shot interference SN in the separated effective signal is added to the adjacent shot interference NN purified in the separated adjacent shot interference to obtain the final separated adjacent shot Interfere with N1.

The effective signal S1=SS+NS of final separation

which is

The final separated adjacent gun interference N1=SN+NN Formula 5

In this embodiment, after the finally separated effective signal S1 and the finally separated adjacent shot interference N1 are obtained through step 106, they can be used for migration imaging of conventional seismic methods.

The time-domain aliased two-dimensional shot record data is obtained, as shown in Fig. 2. Among them, the aliased randomly excited neighboring shots have the same performance characteristics as the data excited by conventional shots in the common shot point gather data.

Obtain the aliasing data in the common center point gather b through step 102, as shown in FIG. 3 ; wherein, the adjacent shot interference information appears as random inconsistent noise in the common center point gather.

The separated effective signal S obtained through step 103 is shown in FIG. 4 ; most of the adjacent shot interference in the form of random noise is removed from the separated effective signal S, and the purified effective signal with good consistency is mainly retained. The separated adjacent-cannon interference N obtained in step 103 is shown in FIG. 5 ; the separated adjacent-cannon interference N includes purified adjacent-cannon interference.

The separated effective signal S is converted into the common shot point gather through step 104, and the effective signal S' in the common shot point gather obtained after the transform of the gather is shown in FIG. 6 . Through step 104, the separated adjacent shot interference N is converted into the common shot point gather, and the adjacent shot interference N' in the common shot point gather is obtained as shown in FIG. 7 .

The final separated effective signal S1 obtained through step 106 is shown in FIG. 8 , and the final separated adjacent-gun interference N1 obtained is shown in FIG. 9 .

The present invention has the following beneficial effects: the influence of aliasing noise can be removed by means of multi-domain multiple separation, and the quality of data separation can be improved; the above process can provide data for migration imaging using conventional seismic methods, and improve the quality of migration . The technical solution provided by the embodiment of the present invention solves the problem that the prior art utilizes the statistical characteristics of the effective signal to suppress the aliasing noise. Therefore, the quality of data separation is relatively low for multi-source aliasing shot data with a relatively low aliasing signal-to-noise ratio. Poor, which in turn leads to poor results of migration imaging using conventional methods.

The sequence of the above embodiments is only for convenience of description, and does not represent the advantages or disadvantages of the embodiments.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (7)

1. a kind of more focus blended data separation methods of the highly effective gathering of multiple domain separating for several times, which is characterized in that including：

S10, the two-dimentional big gun record m for obtaining Time-domain aliasing；

S20, the m and preset transfer function Ψ from common-shot-gather to common midpoint gather is recorded according to the two-dimentional big gun, obtained Aliased data is taken in common midpoint gather b；

S30, the useful signal for obtaining separation in common midpoint gather b according to default consistency wave filter П and the aliased data The S and adjacent big gun of separation interference N；

S40, the useful signal S of the separation and the adjacent big gun of separation are interfered according to the transfer function Ψ of the common midpoint gather N is transformed into common-shot-gather respectively, obtains the useful signal S ＇ detached after trace gather conversion and the adjacent big gun detached after trace gather conversion Interfere N ＇；

The adjacent big gun that S50, the useful signal S ＇ detached after being converted according to the trace gather and trace gather detach after converting interferes N ＇, obtains respectively The adjacent big gun interference NN purified in the adjacent big gun interference of useful signal NS, separation that the adjacent big gun of separation reveals in interfering and separation is taken to have Remaining adjacent big gun interference SN in the useful signal SS and the useful signal of separation that are purified in effect signal；

The adjacent big gun purified in S60, the useful signal NS revealed in being interfered according to the adjacent big gun of the separation, the adjacent big gun detached interference is done Remaining adjacent big gun interference SN in the useful signal SS purified in NN, the useful signal detached and the useful signal of separation is disturbed, it is right It should reconfigure, build the useful signal S1 of final separation and the adjacent big gun interference N1 of final separation.

2. the more focus blended data separation methods of the highly effective gathering of multiple domain separating for several times according to claim 1, feature It is, the S20, including：

The two-dimentional big gun record m is multiplied by the transfer function Ψ, obtains the aliased data in common midpoint gather b.

3. the more focus blended data separation methods of the highly effective gathering of multiple domain separating for several times according to claim 1, feature It is, the S30, including：

S301, the default consistency wave filter П is multiplied by the aliased data in common midpoint gather b, what is detached has Imitate signal S；

S302, the useful signal S that the aliased data is subtracted the separation in common midpoint gather b, obtain the separation Adjacent big gun interferes N.

4. the more focus blended data separation methods of the highly effective gathering of multiple domain separating for several times according to claim 1, feature It is, the S40, including：

S401, the transfer function Ψ from common midpoint gather to common-shot-gather is obtained according to the transfer function Ψ^T；

S402, by the transfer function Ψ^TThe useful signal S of the separation is multiplied by, obtains the useful signal detached after trace gather conversion S ＇；

S403, by the transfer function Ψ^TThe adjacent big gun interference N of the separation is multiplied by, obtains the adjacent big gun interference detached after trace gather conversion N ＇.

5. the more focus blended data separation methods of the highly effective gathering of multiple domain separating for several times according to claim 1, feature It is, the S50, including：

S501, the default consistency wave filter П is multiplied by the adjacent big gun interference N ＇ detached after the trace gather conversion, obtained described The adjacent big gun interference NN purified in the adjacent big gun interference of separation；

S502, the adjacent big gun interference N ＇ detached after the trace gather is converted subtract the adjacent big gun purified in the adjacent big gun interference of the separation and do NN is disturbed, obtains the useful signal NS revealed in the adjacent big gun interference of the separation；

S503, the default consistency wave filter П is multiplied by the useful signal S ＇ detached after the trace gather conversion, obtained described The useful signal SS purified in the useful signal of separation；

S504, the useful signal S ＇ detached after the trace gather is converted subtract the effective letter purified in the useful signal of the separation Number SS obtains remaining neighbour's big gun interference SN in the useful signal of the separation.

6. the more focus blended data separation methods of the highly effective gathering of multiple domain separating for several times according to claim 1, feature It is, the S60, including：

S601, by the useful signal SS that is purified in the useful signal of the separation plus being revealed in the adjacent big gun interference of the separation Useful signal NS, the useful signal S1 being finally recovered；

S602, neighbour's big gun interference SN remaining in the useful signal of the separation is added what is purified in the adjacent big gun interference of the separation Adjacent big gun interferes NN, the adjacent big gun interference N1 being finally recovered.

7. the highly effective gathering of multiple domain separating for several times as claimed in any of claims 1 to 6 more focus blended datas point From method, which is characterized in that the consistency wave filter is multidimensional vector intermediate value consistency wave filter.