CN102967878A - Method and device for predicting oil and gas reservoirs through passive seismic wave field - Google Patents

Abstract

An embodiment of the invention relates to the field of oil and gas reservoir prediction and particularly relates to a method and device for predicting oil and gas reservoirs through a passive seismic wave field. The method includes: time domain passive seismic information is obtained, and the time domain passive seismic information is converted into frequency domain passive seismic information; the frequency domain passive seismic information is sorted to a common detector gather to perform overlying treatment on frequency domains, and frequency domain overlying information is obtained; the frequency domain overlying information is displayed as a frequency domain overlying section according to the sequence of detection point number; and abnormal energy range is recognized from the frequency domain overlying section so as to predict the oil and gas reservoirs. Abnormal information of the passive seismic wave field is used for determining positions of the oil and gas reservoirs, no artificial stimulation is needed, a large amount of cost and environmental cost can be saved, and the method and device can further be used for reflecting complex exploration areas with failure seismic exploration.

Description

A kind of method and device of passiveseismic wave field predicting hydrocarbon reservoirs

Technical field

The present invention relates to the prediction of oil-gas reserve field, relate in particular to a kind of method and device of passiveseismic wave field predicting hydrocarbon reservoirs.

Background technology

The common seismic exploration engineering has had comparatively proven technique through long-run development, from initial two-dimension earthquake exploration, three-dimensional exploration, to the three-dimensional exploration of multi-wave and multi-component, high density wide-azimuth of newly-developed.

But, the focus of common seismic needs the artificial excitation, the exploration of a block from design, field acquisition is disposed the whole cycle to data processing, reservoir prediction, oil and gas detection, well location needs at least one to two year, used device is many, its human resources and cost consumption are quite huge, bring huge pressure to environment simultaneously.And the focus of common seismic is generally on the earth's surface, the source location is known, its exploration idea is to carry out the multiattribute multidisciplinary synthesis on the basis of subsurface formations accurate imaging to analyze to seek hydrocarbon-bearing pool, therefore the development of conventional survey technology, it is long but more and more to face exploration cycle, cost is high, the challenge that environmental pressure is large.

To sum up, seeking the oil-gas exploration technical method that a kind of efficient is higher, more economical, environment is more friendly is imminent.

Summary of the invention

The embodiment of the invention provides a kind of method and device of passiveseismic wave field predicting hydrocarbon reservoirs, be used for solving prior art common seismic exploration engineering and need the artificial excitation, and it is long to face exploration cycle, and cost is high, the problem that its human resources and cost consumption are quite huge.

The method of a kind of passiveseismic wave field predicting hydrocarbon reservoirs be used to solving the problems of the technologies described above that the embodiment of the invention provides wherein, comprising:

Acquisition time territory passiveseismic information;

Convert described time domain passiveseismic information to frequency field passiveseismic information;

Described frequency field passiveseismic information is sorted into the overlap-add procedure that common detector gather is done frequency field, obtains the frequency field overlapped information;

Described frequency field overlapped information is shown as the frequency field stacked section according to the order of detection period;

From the unusual scope of described frequency field stacked section identification energy, and then predicting hydrocarbon reservoirs.

The method of above-mentioned passiveseismic wave field predicting hydrocarbon reservoirs, wherein, described convert described time domain passiveseismic information to frequency field passiveseismic information after, described method also comprises:

Described frequency field passiveseismic information is calculated the root mean square energy of minute frequency segment information in described frequency field, and draw the root mean square energy trace of minute frequency segment information;

Identification energy abnormal ranges from the root mean square energy trace of described minute frequency segment information, and then verify described hydrocarbon-bearing pool.

The method of above-mentioned passiveseismic wave field predicting hydrocarbon reservoirs, wherein, described acquisition time territory passiveseismic information comprises: the information that filtering is lower than very first time length value and surpasses the first frequency value from initial passiveseismic information; Wherein: described very first time length is not higher than 500ms, and described first frequency value is not less than 40Hz.

The method of above-mentioned passiveseismic wave field predicting hydrocarbon reservoirs, wherein, according to formula:

$S_{\mathrm{stk}}\left(\mathrm{\ω}\right)=\frac{S_{\mathrm{nor}{m}_1}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_2}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_3}\left(\mathrm{\ω}\right)+...+S_{{\mathrm{norm}}_n}\left(\mathrm{\ω}\right)}{n}$

Do the overlap-add procedure of frequency field at described common detector gather; Wherein, S _Stk(ω) be described frequency field overlapped information at described common detector gather,

Be the seismic trace of common detector gather, 1,2,3 ... n is the road number of common detector gather.

The method of above-mentioned passiveseismic wave field predicting hydrocarbon reservoirs, wherein, according to formula:

$A_{\mathrm{rms}}=\frac{1}{L}{\left(\mathrm{\Σ}{S}_{\mathrm{stk}}{\left({\mathrm{\ω}}_i\right)}^2\right)}^{\frac{1}{2}}$ Calculate the root mean square energy of described minute frequency segment information; Wherein, A _RmsBe the root mean square energy value of minute frequency segment information, L is number of samples in minute frequency band, S _Stk(ω _i) be that frequency field passiveseismic information is at the energy value at i sampling point place.

The embodiment of the invention also provides a kind of device of passiveseismic wave field predicting hydrocarbon reservoirs, comprising:

Information acquisition unit is used for acquisition time territory passiveseismic information;

Converting unit is used for converting described time domain passiveseismic information to frequency field passiveseismic information;

Processing unit is used for described frequency field passiveseismic information is sorted into the overlap-add procedure that common detector gather is done frequency field, obtains the frequency field overlapped information;

The section display unit is used for described frequency field overlapped information is shown as the frequency field stacked section according to the order of detection period;

Predicting unit is used for from the unusual scope of described frequency field stacked section identification energy, and then predicting hydrocarbon reservoirs.

The device of above-mentioned passiveseismic wave field predicting hydrocarbon reservoirs, wherein, described device also comprises: the information analysis unit is used for described frequency field passiveseismic information is calculated the root mean square energy of minute frequency segment information in described frequency field, and draws the root mean square energy trace of minute frequency segment information;

Described predicting unit also is used for from the root mean square energy trace identification energy abnormal ranges of described minute frequency segment information, and then verifies described hydrocarbon-bearing pool.

The device of above-mentioned passiveseismic wave field predicting hydrocarbon reservoirs, wherein, described device also comprises: filter element is used for the information that is lower than very first time length value and surpasses the first frequency value from the filtering of initial passiveseismic information; Wherein: described very first time length is not higher than 500ms, and described first frequency value is not less than 40Hz.

The device of above-mentioned passiveseismic wave field predicting hydrocarbon reservoirs, wherein, described processing unit is according to formula:

$S_{\mathrm{stk}}\left(\mathrm{\ω}\right)=\frac{S_{\mathrm{nor}{m}_1}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_2}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_3}\left(\mathrm{\ω}\right)+...+S_{{\mathrm{norm}}_n}\left(\mathrm{\ω}\right)}{n}$

The overlap-add procedure of doing frequency field at described common detector gather obtains the frequency field overlapped information, wherein, and S _Stk(ω) be the information after the stack of common detector gather frequency field,

Be the seismic trace of common detector gather, 1,2,3 ... n is the road number of common detector gather.

The device of above-mentioned passiveseismic wave field predicting hydrocarbon reservoirs, wherein, described device also comprises: computing unit is used for according to formula:

$A_{\mathrm{rms}}=\frac{1}{L}{\left(\mathrm{\Σ}{S}_{\mathrm{stk}}{\left({\mathrm{\ω}}_i\right)}^2\right)}^{\frac{1}{2}}$

Calculate the root mean square energy of described minute frequency segment information; Wherein, A _RmsBe the root mean square energy of minute frequency segment information, L is number of samples in minute frequency band, S _Stk(ω _i) be that frequency field passiveseismic information is at the energy value at i sampling point place.

Method and the device of the passiveseismic wave field predicting hydrocarbon reservoirs by the embodiment of the invention, do not need the artificial excitation, and passiveseismic is to utilize various abnormal informations directly to determine the position of hydrocarbon-bearing pool, therefore can save a large amount of manpowers, time, financial cost and environmental cost.

Description of drawings

Accompanying drawing described herein is used to provide a further understanding of the present invention, consists of the application's a part, does not consist of limitation of the invention.In the accompanying drawings:

The method flow diagram of a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 1 provides for the embodiment of the invention;

The source book information synoptic diagram that common seismic gathers in the method for a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 2 provides for the embodiment of the invention;

Initial passiveseismic information synoptic diagram in the method for a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 3 provides for the embodiment of the invention;

Time domain passiveseismic information synoptic diagram in the method for a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 4 provides for the embodiment of the invention;

The method medium frequency territory passiveseismic information of a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 5 provides for the embodiment of the invention is in the frequency field diagrammatic cross-section of common detector gather single-coverage;

The frequency field stacked section synoptic diagram of the method medium frequency territory passiveseismic information of a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 6 provides for the embodiment of the invention after the common detector gather stack;

The method medium frequency territory passiveseismic information of a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 7 provides for the embodiment of the invention is at the root mean square energy trace of minute frequency segment information of frequency field;

The device synoptic diagram of a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 8 provides for the embodiment of the invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.At this, illustrative examples of the present invention and explanation thereof are used for explanation the present invention, but not as a limitation of the invention.

The method flow diagram of a kind of passiveseismic wave field predicting hydrocarbon reservoirs that Fig. 1 provides for the embodiment of the invention comprises:

Step 101, acquisition time territory passiveseismic information; Concrete, the information that filtering is lower than very first time length value and surpasses the first frequency value from initial passiveseismic information; Wherein: described very first time length is not higher than 500ms, described first frequency value is not less than 40Hz, as shown in Figure 3, be the initial passiveseismic information in the present embodiment, shown in Fig. 4 for the initial passiveseismic information shown in Fig. 3 being carried out the time domain passiveseismic information after the filtering.Better, wherein very first time length is 500ms, the first frequency value is 40Hz, short passiveseismic information the low-frequency information distortion can occur when being transformed into frequency field because time span is lower than the time domain of 500ms, equally, it is serious that frequency surpasses the common interfering noise of high-frequency information of 40Hz, and they all may produce illusion, therefore need first filtering, so that the time domain passiveseismic information that obtains has been got rid of the impact of distortion and noise.

In one embodiment of the invention, initial passiveseismic information can be obtained from the source book information of common seismic collection; As shown in Figure 2, be the source book information synoptic diagram that common seismic gathers, the zone that wherein marks the A place is initial passiveseismic information region, and the zone of mark B is the artificial earthquake information area; In the source book information that common seismic shown in Figure 2 gathers, filter out artificial earthquake information, only keep man-made explosion primary wave time passiveseismic information in the past as initial passiveseismic information; Subsequently, be lower than the information of very first time length and the information that surpasses the first frequency value in the initial passiveseismic information of filtering, can obtain time domain passiveseismic information.

In another embodiment of the present invention, initial passive information can also directly receive the passiveseismic source book from wave detector and read, because the passiveseismic information of utilizing wave detector directly to receive only comprises initial passiveseismic information, do not comprise artificial earthquake information, can make things convenient for, directly obtain initial passiveseismic information.

Step 102 converts described time domain passiveseismic information to frequency field passiveseismic information; Thereby carry out follow-up frequency field overlap-add procedure and at the frequency field curve plotting.Better, can be according to formula:

$S(\mathrm{\ω},\mathrm{\τ})={\∫}_{-\∞}^{\∞}s\left(t\right)g(t-\mathrm{\τ})e^{-\mathrm{j\ω\τ}}\mathrm{dt}$

Convert described time domain passiveseismic information to frequency field passiveseismic information, wherein, S (ω, τ) is frequency field passiveseismic information, and s (t) is time domain passiveseismic information, and g (t) is window function.Concrete, if the limited passiveseismic information of time domain is s (t), s (t) comprises two parts content usually: time domain passiveseismic wave field and noise information, frequency field passiveseismic information is S (ω, τ), utilize the Short Time Fourier Transform formula, passiveseismic wave field and noise information s (t) that time domain is limited transform to frequency field passiveseismic information S (ω, τ); Wherein g (t) is window function, go to cut the effective length of passiveseismic s (t) with window function g (t) in time domain, make Fourier transform to cutting down the local signal that comes, because s (t) message length and window function are determined, can write a Chinese character in simplified form into S (ω) to S (ω, τ).Above-mentioned with time domain convert to frequency field be because identical wave field passiveseismic information frequency characteristic of field similar, random noise does not then have the feature of similar frequency field, therefore just can be by strengthening the passiveseismic information signal, the compacting noise in follow-up process.

Step 103 is sorted into the overlap-add procedure that common detector gather is done frequency field with the frequency field passiveseismic information that obtains in the step 102, obtains the frequency field overlapped information; Need to obtain passiveseismic accurate time delay owing to do stack in time domain, and in the passiveseismic information of usually extracting, because the signal of passiveseismic information is extremely faint, it is very difficult time delay to want to obtain accurately passiveseismic.Therefore utilize frequency field passiveseismic information at common detector gather frequency field stacking method in the embodiment of the invention, need not to obtain passiveseismic accurate time delay, and utilize passive wave field information can also effectively suppress the random noise of frequency field in the stack of common detector gather frequency field, strengthen the signal of stable passiveseismic information.

Step 104 is shown as the frequency field stacked section with described frequency field overlapped information according to the order of detection period, so that the more intuitively distribution on sectional view of observed frequency territory overlapped information;

Step 105, the unusual scope of identification energy from described frequency field stacked section, and then whether prediction contains hydrocarbon-bearing pool.

By the method in the above embodiment of the present invention, realized utilizing the passiveseismic information that obtains in the initial passiveseismic information to come the predicting hydrocarbon reservoirs distribution range, if the passive wave field that receives comprises underground reservoir information, it is unusual then can energy to occur at the band segment of oily scope, and need not the artificial excitation, both can save the time of later stage seismic data processing, reservoir prediction, also can improve the precision of prediction of oil-gas reserve, and can focus on that the later stage seismic data is processed, the emphasis of reservoir prediction, further seek the evidence that hydrocarbon-bearing pool exists.

In the method for the passiveseismic wave field predicting hydrocarbon reservoirs that the embodiment of the invention provides, better, after converting described time domain passiveseismic information to frequency field passiveseismic information, described method also comprises: the root mean square energy that described frequency field passiveseismic information is calculated minute frequency segment information in described frequency field, and draw the root mean square energy trace of minute frequency segment information, analyze and verify that energy is in the variation in frequency and space with this.

Identification energy abnormal ranges from the root mean square energy trace of described minute frequency band, in conjunction with above-mentioned method common identification hydrocarbon-bearing pool in the unusual scope of frequency field stacked section identification energy, can improve the reliability of identification, reach and make the efficient of prediction higher, accuracy is more accurate.

Wherein, better in the method for the passiveseismic wave field predicting hydrocarbon reservoirs that the embodiment of the invention provides, according to formula: $S_{\mathrm{stk}}\left(\mathrm{\ω}\right)=\frac{S_{\mathrm{nor}{m}_1}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_2}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_3}\left(\mathrm{\ω}\right)+...+S_{{\mathrm{norm}}_n}\left(\mathrm{\ω}\right)}{n},$ Do the overlap-add procedure of frequency field at described common detector gather; Wherein, S _Stk(ω) be the information after the stack of common detector gather frequency field,

Be the seismic trace of common detector gather, 1,2,3 ... n is the road number of common detector gather.Be illustrated in figure 5 as frequency field passiveseismic information in the frequency field diagrammatic cross-section of common detector gather through single-coverage, frequency field passiveseismic information is passed through multi-fold at common detector gather, namely do the overlap-add procedure of frequency field, can obtain frequency field stacked section as shown in Figure 6; Wherein mark C position energy and occur unusually namely can regarding as the drilling well position, in above-described embodiment the common detector gather frequency field is done overlap-add procedure and not only suppressed later on noise, also so that energy is unusually more obvious.

In the method for the passiveseismic wave field predicting hydrocarbon reservoirs that the embodiment of the invention provides, better, according to formula:

$A_{\mathrm{rms}}=\frac{1}{L}{\left(\mathrm{\Σ}{S}_{\mathrm{stk}}{\left({\mathrm{\ω}}_i\right)}^2\right)}^{\frac{1}{2}}$

Calculate the root mean square energy of described minute frequency segment information; Wherein, A _RmsWhat divide the frequency segment information is the root mean square energy, and L is number of samples in minute frequency band, S _Stk(ω _i) be that frequency field passiveseismic information is at the energy value at i sampling point place.As shown in Figure 7, after described frequency field passiveseismic information was divided into different frequency bands, by the root mean square energy trace that the root mean square energy value that obtains is drawn, wherein marking the D position was the energy exception, therefore can regard as the drilling well position.As can be known, the frequency field stacked section is consistent with the out-of-the way position of the root mean square energy trace of minute frequency segment information, has more verified thus the drilling well result from Fig. 6 and Fig. 7.

By said method, do not need the artificial excitation, and passiveseismic information is to utilize various abnormal informations directly to determine the position of hydrocarbon-bearing pool, therefore can save a large amount of manpowers, time, financial cost and environmental cost.

The embodiment of the invention also provides a kind of device of passiveseismic wave field predicting hydrocarbon reservoirs, and as shown in Figure 8, it comprises:

Information acquisition unit 801 is used for filter acquisition time territory passiveseismic information;

Converting unit 802 is used for converting described time domain passiveseismic information to frequency field passiveseismic information; Better, described converting unit 802 is utilized formula: $S(\mathrm{\ω},\mathrm{\τ})={\∫}_{-\∞}^{\∞}s\left(t\right)g(t-\mathrm{\τ})e^{-\mathrm{j\ω\τ}}\mathrm{dt},$ Convert described time domain passiveseismic information to frequency field passiveseismic information, wherein, S (ω, τ) is frequency field passiveseismic information, and s (t) is time domain passiveseismic information, and g (t) is window function.

Above-mentioned with time domain convert to frequency field be because identical wave field passiveseismic information frequency characteristic of field similar, random noise does not then have the feature of similar frequency field, therefore just can be by strengthening the passiveseismic information signal, the compacting noise in follow-up process.

Processing unit 803 is used for that described frequency field passiveseismic information is sorted into common detector gather and does the overlap-add procedure of frequency field and obtain the frequency field overlapped information; Need to obtain passiveseismic accurate time delay owing to do stack in time domain, and in the passiveseismic information of usually extracting, because the signal of passiveseismic information is extremely faint, it is very difficult time delay to want to obtain accurately passiveseismic.Therefore utilize frequency field passiveseismic information at common detector gather frequency field stacking method in the embodiment of the invention, need not to obtain passiveseismic accurate time delay, and utilize passive wave field information can also effectively suppress the random noise of frequency field in the stack of common detector gather frequency field, strengthen the signal of stable passiveseismic information.

Section display unit 804 is used for described frequency field overlapped information is shown as the frequency field stacked section according to the order of detection period, so that the more intuitively distribution on sectional view of observed frequency territory overlapped information;

Predicting unit 806 be used for from the unusual scope of described frequency field stacked section identification energy, and then whether prediction contains hydrocarbon-bearing pool.

In the device of the passiveseismic wave field predicting hydrocarbon reservoirs that the embodiment of the invention provides, better, described device also comprises:

Information analysis unit 805 is used for described frequency field passiveseismic information is calculated the root mean square energy of minute frequency segment information in described frequency field, and draws the root mean square energy trace of minute frequency segment information; With the variation of this analysing energy in frequency and space.

Predicting unit 806 also is used for from the root mean square energy trace identification energy abnormal ranges of described minute frequency segment information, in conjunction with above-mentioned method common identification and checking hydrocarbon-bearing pool in the unusual scope of frequency field stacked section identification energy, can improve the reliability of identification, reach and make the efficient of prediction higher, accuracy is more accurate.

In the device of the passiveseismic wave field predicting hydrocarbon reservoirs that the embodiment of the invention provides, better, described device also comprises: filter element 807 is used for the information that is lower than very first time length value and surpasses the first frequency value from the filtering of initial passiveseismic information; Wherein: described very first time length is not higher than 500ms, and described first frequency value is not less than 40Hz.Better, wherein very first time length is 500ms, the first frequency value is 40Hz, short passiveseismic information the low-frequency information distortion can occur when being transformed into frequency field because time span is lower than the time domain of 500ms, equally, it is serious that frequency surpasses the common interfering noise of high-frequency information of 40Hz, and they all may produce illusion, therefore need first filtering, so that the time domain passiveseismic information that obtains has been got rid of the impact of distortion and noise.

Wherein, in one embodiment of the invention, initial passiveseismic information can be obtained from the source book information of common seismic collection; In the source book information that common seismic gathers, filter out artificial earthquake information, only keep man-made explosion primary wave time passiveseismic information in the past as initial passiveseismic information; Subsequently, be lower than the information of very first time length and the information that surpasses the first frequency value in the initial passiveseismic information of filtering, can obtain time domain passiveseismic information.

In another embodiment of the present invention, initial passive information can also directly receive the passiveseismic source book from wave detector and read, because the passiveseismic information of utilizing wave detector directly to receive only comprises initial passiveseismic information, do not comprise artificial earthquake information, can make things convenient for, directly obtain initial passiveseismic information.

In the device of the passiveseismic wave field predicting hydrocarbon reservoirs that the embodiment of the invention provides, better, described processing unit 803 is according to formula:

$S_{\mathrm{stk}}\left(\mathrm{\ω}\right)=\frac{S_{\mathrm{nor}{m}_1}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_2}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_3}\left(\mathrm{\ω}\right)+...+S_{{\mathrm{norm}}_n}\left(\mathrm{\ω}\right)}{n}$

The overlap-add procedure of doing frequency field at described common detector gather obtains the frequency field overlapped information, wherein, and S _Stk(ω) be the information after the stack of common detector gather frequency field,

Be the seismic trace of common detector gather, 1,2,3 ... n is the road number of common detector gather, and the stack of common detector gather frequency field has not only been suppressed noise later, also so that energy is unusually more obvious.

In the device of the passiveseismic wave field predicting hydrocarbon reservoirs that the embodiment of the invention provides, better, also comprise: computing unit 808 is used for according to formula:

$A_{\mathrm{rms}}=\frac{1}{L}{\left(\mathrm{\Σ}{S}_{\mathrm{stk}}{\left({\mathrm{\ω}}_i\right)}^2\right)}^{\frac{1}{2}}$

Calculate the root mean square energy of described minute frequency segment information; Wherein, A _RmsBe the root mean square energy of minute frequency segment information, L is number of samples in minute frequency band, S _Stk(ω _i) be frequency field passiveseismic information at the energy value at i sampling point place, the root mean square energy trace by minute frequency segment information that obtains can make the efficient of prediction higher in conjunction with the common predicting hydrocarbon reservoirs of frequency field stacked section, accuracy is more accurate.

Whereby, the embodiment of the invention is utilized the common predicting hydrocarbon reservoirs of root mean square energy trace of the resulting frequency field stacked section of passiveseismic information and minute frequency segment information, do not need the artificial excitation, and can save a large amount of manpowers, time, financial cost and environmental cost.

Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; the protection domain that is not intended to limit the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. the method for a passiveseismic wave field predicting hydrocarbon reservoirs is characterized in that, described method comprises:

Acquisition time territory passiveseismic information;

Convert described time domain passiveseismic information to frequency field passiveseismic information;

Described frequency field passiveseismic information is sorted into the overlap-add procedure that common detector gather is done frequency field, obtains the frequency field overlapped information;

Described frequency field overlapped information is shown as the frequency field stacked section according to the order of detection period;

From the unusual scope of described frequency field stacked section identification energy, and then predicting hydrocarbon reservoirs.

2. the method for described passiveseismic wave field predicting hydrocarbon reservoirs according to claim 1 is characterized in that, described convert described time domain passiveseismic information to frequency field passiveseismic information after, described method also comprises:

Described frequency field passiveseismic information is calculated the root mean square energy of minute frequency segment information in described frequency field, and draw the root mean square energy trace of minute frequency segment information;

The unusual scope of identification energy from the root mean square energy trace of described minute frequency segment information, and then verify described hydrocarbon-bearing pool.

3. the method for described passiveseismic wave field predicting hydrocarbon reservoirs according to claim 1 is characterized in that described acquisition time territory passiveseismic information comprises: the information that filtering is lower than very first time length value and surpasses the first frequency value from initial passiveseismic information; Wherein: described very first time length is not higher than 500ms, and described first frequency value is not less than 40Hz.

4. the method for described passiveseismic wave field predicting hydrocarbon reservoirs according to claim 1 is characterized in that, according to formula:

$S_{\mathrm{stk}}\left(\mathrm{\ω}\right)=\frac{S_{\mathrm{nor}{m}_1}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_2}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_3}\left(\mathrm{\ω}\right)+...+S_{{\mathrm{norm}}_n}\left(\mathrm{\ω}\right)}{n}$

Do the overlap-add procedure of frequency field at described common detector gather; Wherein, S _Stk(ω) be described frequency field overlapped information at described common detector gather,

Be the seismic trace of common detector gather, 1,2,3 ... n is the road number of common detector gather.

5. the method for described passiveseismic wave field predicting hydrocarbon reservoirs according to claim 2 is characterized in that, according to formula:

$A_{\mathrm{rms}}=\frac{1}{L}{\left(\mathrm{\Σ}{S}_{\mathrm{stk}}{\left({\mathrm{\ω}}_i\right)}^2\right)}^{\frac{1}{2}}$

Calculate the root mean square energy of described minute frequency segment information; Wherein, A _RmsBe the root mean square energy value of minute frequency segment information, L is number of samples in minute frequency band, S _Stk(ω _i) be that frequency field passiveseismic information is at the energy value at i sampling point place.

6. the device of a passiveseismic wave field predicting hydrocarbon reservoirs is characterized in that, comprising:

Information acquisition unit is used for acquisition time territory passiveseismic information;

Converting unit is used for converting described time domain passiveseismic information to frequency field passiveseismic information;

Processing unit is used for described frequency field passiveseismic information is sorted into the overlap-add procedure that common detector gather is done frequency field, obtains the frequency field overlapped information;

The section display unit is used for described frequency field overlapped information is shown as the frequency field stacked section according to the order of detection period;

Predicting unit is used for from the unusual scope of described frequency field stacked section identification energy, and then predicting hydrocarbon reservoirs.

7. the device of described passiveseismic wave field predicting hydrocarbon reservoirs according to claim 6 is characterized in that described device also comprises:

The information analysis unit is used for dividing the root mean square energy of frequency segment information with described frequency field passiveseismic information at described frequency field inner analysis, and draws the root mean square energy trace of minute frequency segment information;

Described predicting unit also is used for from the root mean square energy trace identification energy abnormal ranges of described minute frequency segment information, and then verifies described hydrocarbon-bearing pool.

8. the device of described passiveseismic wave field predicting hydrocarbon reservoirs according to claim 6, it is characterized in that described device also comprises: filter element is used for the information that is lower than very first time length value and surpasses the first frequency value from the filtering of initial passiveseismic information; Wherein: described very first time length is not higher than 500ms, and described first frequency value is not less than 40Hz.

9. the device of described passiveseismic wave field predicting hydrocarbon reservoirs according to claim 6 is characterized in that, described processing unit is according to formula:

$S_{\mathrm{stk}}\left(\mathrm{\ω}\right)=\frac{S_{\mathrm{nor}{m}_1}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_2}\left(\mathrm{\ω}\right)+S_{{\mathrm{norm}}_3}\left(\mathrm{\ω}\right)+...+S_{{\mathrm{norm}}_n}\left(\mathrm{\ω}\right)}{n}$

The overlap-add procedure of doing frequency field at described common detector gather obtains the frequency field overlapped information, wherein, and S _Stk(ω) be the information after the stack of common detector gather frequency field,

Be the seismic trace of common detector gather, 1,2,3 ... n is the road number of common detector gather.

10. the device of described passiveseismic wave field predicting hydrocarbon reservoirs according to claim 7, it is characterized in that described device also comprises: computing unit is used for according to formula:

$A_{\mathrm{rms}}=\frac{1}{L}{\left(\mathrm{\Σ}{S}_{\mathrm{stk}}{\left({\mathrm{\ω}}_i\right)}^2\right)}^{\frac{1}{2}}$

Calculate the root mean square energy of described minute frequency segment information; Wherein, A _RmsBe the root mean square energy of minute frequency segment information, L is number of samples in minute frequency band, S _Stk(ω _i) be that frequency field passiveseismic information is at the energy value at i sampling point place.

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