CN105093316A - Ground array micro seismic data static correction method of search along well trajectory - Google Patents
Ground array micro seismic data static correction method of search along well trajectory Download PDFInfo
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Abstract
The invention discloses a ground array micro seismic data static correction method of search along a well trajectory. The method comprises the steps of carrying optimal search along the well trajectory in ground array micro seismic data when perforating point position coordinates are unknown based on the principle that stacked energy is the strongest, and determining the coordinates of perforating point positions; carrying out dynamic correction of the micro seismic data, and calculating a static correction standard trace of the micro seismic data by using a cross-correlation stacking method; taking the static correction standard trace of the micro seismic data as the reference, and calculating a final static correction time difference in the micro seismic data due to near-surface factors; and bringing the final static correction time difference into the micro seismic data of the well in another period of time, eliminating a static correction problem of the micro seismic data, and improving the positioning accuracy of a micro seismic source point. According to the invention, optical search is carried out along the well trajectory, the static correction time difference due to the near-surface factors can be eliminated based on the static correction standard trace, and the positioning accuracy of the micro seismic source point in fracturing construction can be effectively improved.
Description
Technical field
The present invention relates to microearthquake data static corrections processing technology in oil gas geophysical survey, the surface array particularly related to along well track search declines geological data static correcting method.
Background technology
The physical property characteristic of unconventionaloil pool Effective Reservoirs shows as comparatively low-porosity and comparatively low-permeability, by the fracturing reform work of Effective Reservoirs, the Fracture System between pit shaft and crack, stratum can be improved, increase seepage channel, improve effective permeability and production capacity, fracture job is the effective ways of unconventionaloil pool resource exploitation.With regard to current technology, micro-seismic monitoring is the most effective, most economical and Fracturing Monitoring technology the most timely.Surface array declines seismic monitoring wave detector according to more regular arranged, and according to the depth design spread length of fracturing section.
Due near surface condition relative complex, low velocity layer variation in thickness is violent, when rock burst, after seismic event upwards propagates across near surface, the dramatic impact of near surface will be subject to the time of arrival of focal point primary wave, except there is the different normal moveout caused of propagation distance between different micro-seismic monitoring wave detector road, also there is the static moveout that near surface factor causes.Only have the static moveout eliminated near surface and cause, the time difference could caused according to propagation distance difference between different micro-seismic monitoring wave detector carries out focal point location, and ensures the degree of accuracy that focal point is located.Conventional microearthquake data static correcting method needs the coordinate of known shooting point position, if shooting point position coordinates is unknown, conventional microearthquake data static correcting method just loses effect.
Summary of the invention
When the object of the invention is for the microearthquake position coordinates the unknown of microearthquake data shooting point, a kind of surface array along well track search is provided to decline geological data static correcting method.
The present invention by the following technical solutions.
Surface array along well track search declines geological data static correcting method, comprises the following steps:
Step 1: decline in geological data at surface array, when the unknown of shooting point position coordinates, the principle the strongest according to stack power, carries out optimum search along well track, determines the coordinate of shooting point position;
Step 2: normal moveout correction process is carried out to microearthquake data, and utilize cross-correlation stacking method, calculate the static correction standard track of microearthquake data;
Step 3: with the static correction standard track of microearthquake data for benchmark, eliminates in microearthquake data due to final static moveout that near surface factor causes;
Step: 4: be brought into by final static moveout in the microearthquake data of other period of this well, eliminates the static correction problem of microearthquake data, improves the positioning precision of microearthquake focal point.
As preferably, the concrete steps of described step 1 are:
Decline geological data and the well track position coordinate of seismic monitoring recording geometry, the surface array that collects that declined by surface array all imports;
When during surface array declines geological data when the unknown of shooting point position coordinates, based on the maximum principle of stack power of all wave detector track datas, the arrival time of ground array micro-seismic monitoring wave detector is arrived along each well trajectory location points of well track optimum search, arrival time according to correspondence carries out normal moveout correction process to microearthquake data, and all track datas after normal moveout correction process are superposed, ask for the microearthquake data investigation energy value of each well trajectory location points, when stack power value reaches maximum, the normal moveout that the elimination that this well trajectory location points can be best causes due to propagation distance difference is described, achieve optimum normal moveout correction process, namely this well trajectory location points is the shooting point position coordinates corresponding to microearthquake data.
As preferably, the concrete steps of described step 2 are:
According to shooting point position coordinates and the micro-seismic monitoring recording geometry coordinate of microearthquake data, normal moveout correction process is carried out to ground array microearthquake data, eliminate the normal moveout because propagation distance difference between different micro-seismic monitoring wave detector causes, after normal moveout correction process, microearthquake data medium wave is the straight line of a level substantially to lineups;
Choose the microearthquake track data that one signal to noise ratio (S/N ratio) after normal moveout correction process is relatively high, other track data carries out cross correlation process with it, the initial static moveout of cross-correlation calculating arrival time in other track data and choose in track data between arrival time;
Eliminate the initial static moveout of cross-correlation in other microearthquake track data, make the arrival time in other all track data basically identical with the arrival time chosen in track data, the all track datas eliminating the initial static moveout of cross-correlation are carried out overlap-add procedure, is obtained the static correction standard track of microearthquake data by superposition.
As preferably, the concrete steps of described step 3 are:
In microearthquake data, all track datas and static correction standard track carry out cross correlation process, with the arrival time in static correction standard track for standard, arrival time in all track datas is drawn close to standard track, and calculates the standard track static moveout of microearthquake data;
Carry out reaction correction process to microearthquake data, retain the normal moveout that between different micro-seismic monitoring wave detector road, propagation distance difference causes, final static moveout eliminates the static correction problem that near surface factor causes.
As preferably, the concrete steps of described step 4 are:
Final static moveout is brought in the microearthquake data of other period of this well, carries out the static corrections processing of microearthquake data;
Finally export the surface array after static corrections processing to decline geological data.
As preferably, when shooting point coordinate position cannot be determined during surface array declines geological data, based on the principle that stack power is maximum, carry out optimum search along well track, determine the shooting point coordinate position on well track, wherein shooting point position is only positioned on well track.
As preferably, the surface array calculated declines the microearthquake data that the final static moveout of geological data is only adapted within the scope of this well, is not suitable for the microearthquake data of other well section; Final static moveout is brought in each fracturing section microearthquake data of this well, effectively eliminates the static correction problem of microearthquake data.
Beneficial effect of the present invention is: the present invention passes through along well track optimum search method, determine the shooting point position coordinates be positioned on well track, optimum shooting point position coordinates according to determining carries out normal moveout correction process to microearthquake perforation data, cross-correlation standard track is asked in perforation data after normal moveout correction process, based on standard track, eliminate the final static moveout of all microearthquake track datas, the ripple in different microearthquake road is only relevant with propagation distance to the time difference, is conducive to improving microearthquake focal point positioning precision.
Accompanying drawing explanation
Fig. 1 to decline geological data static correcting method process flow diagram schematic diagram along the surface array of well track search in the embodiment of the present invention.
Fig. 2 is that the surface array chosen in the embodiment of the present invention declines earthquake primary data schematic diagram.
Fig. 3 is the method adopted in the embodiment of the present invention in the present invention, carries out the microearthquake schematic diagram data after declining geological data static corrections processing along the surface array of well track search to the initial microearthquake data chosen.
Embodiment
For making above and other object of the present invention, feature and advantage can become apparent, cited below particularly go out preferred embodiment, and coordinate institute's accompanying drawings, be described in detail below.
Embodiment 1.Surface array along well track search declines a geological data static correcting method, and this static correcting method comprises:
(1) decline in geological data at surface array, when the unknown of shooting point position coordinates, the principle the strongest according to stack power, carries out optimum search along well track, determines the coordinate of shooting point position;
(2) normal moveout correction process is carried out to microearthquake data, and utilize cross-correlation stacking method, calculate the static correction standard track of microearthquake data;
(3) with the static correction standard track of microearthquake data for benchmark, eliminate in microearthquake data due to final static moveout that near surface factor causes;
(4) final static moveout is brought in the microearthquake data of other period of this well, eliminates the static correction problem of microearthquake data, improve the positioning precision of microearthquake focal point.
By carrying out optimum search along well track, effectively can determine the shooting point position coordinates corresponding to ground array microearthquake data, and utilize cross-correlation stacking method, according to the static moveout that static correction standard track elimination near surface factor causes, the precision of microearthquake focal point location in pressing crack construction is effectively improved, ensures accuracy and the reliability of oil field compression fracture micro-seismic monitoring result.
Embodiment 2.Surface array along well track search declines a geological data static correcting method, comprises the following steps.
(1) decline geological data and the well track position coordinate of seismic monitoring recording geometry, the surface array that collects that declined by surface array all imports.
(2) when during surface array declines geological data when the unknown of shooting point position coordinates, based on the maximum principle of stack power of all wave detector track datas, the arrival time of ground array micro-seismic monitoring wave detector is arrived along each well trajectory location points of well track optimum search, arrival time according to correspondence carries out normal moveout correction process to microearthquake data, and all track datas after normal moveout correction process are superposed, ask for the microearthquake data investigation energy value of each well trajectory location points, when stack power value reaches maximum, the normal moveout that the elimination that this well trajectory location points can be best causes due to propagation distance difference is described, achieve optimum normal moveout correction process, namely this well trajectory location points is the shooting point position coordinates corresponding to microearthquake data.
(3) according to shooting point position coordinates and the micro-seismic monitoring recording geometry coordinate of microearthquake data, normal moveout correction process is carried out to ground array microearthquake data, eliminate the normal moveout because propagation distance difference between different micro-seismic monitoring wave detector causes, after normal moveout correction process, microearthquake data medium wave is the straight line of a level substantially to lineups.
(4) the microearthquake track data that one signal to noise ratio (S/N ratio) after normal moveout correction process is relatively high is chosen, other track data carries out cross correlation process with it, the initial static moveout of cross-correlation calculating arrival time in other track data and choose in track data between arrival time.
(5) the initial static moveout of cross-correlation in other microearthquake track data is eliminated, make the arrival time in other all track data basically identical with the arrival time chosen in track data, the all track datas eliminating the initial static moveout of cross-correlation are carried out overlap-add procedure, is obtained the static correction standard track of microearthquake data by superposition.
(6) in microearthquake data, all track datas and static correction standard track carry out cross correlation process, with the arrival time in static correction standard track for standard, arrival time in all track datas is drawn close to standard track, and calculates the standard track static moveout of microearthquake data.
(7) carry out reaction correction process to microearthquake data, retain the normal moveout that between different micro-seismic monitoring wave detector road, propagation distance difference causes, the final static moveout of trying to achieve effectively can eliminate the static correction problem that near surface factor causes.
(8) final static moveout is brought in the microearthquake data of other period of this well, carries out the static corrections processing of microearthquake data, finally export the surface array after static corrections processing and to decline geological data.
Embodiment 3.As shown in Figure 1, Fig. 1 is that the surface array along well track search of the embodiment of the present invention declines geological data static correcting method process flow diagram schematic diagram.
In step 101, the seismic observation system that declined by surface array, the surface array collected decline geological data and well trajectory coordinates import simultaneously.
In step 102, when during surface array declines geological data when the unknown of shooting point position coordinates, based on the principle that all wave detector track data stack powers are maximum, the arrival time of ground array micro-seismic monitoring wave detector is arrived along each well trajectory location points of well track optimum search, arrival time according to correspondence carries out normal moveout correction process to data, and all track datas after normal moveout correction process are superposed, ask for the microearthquake data investigation energy value of each well trajectory location points, when stack power value reaches maximum, the normal moveout that the elimination that this well trajectory location points can be best causes due to propagation distance difference is described, achieve optimum normal moveout correction process, namely this well trajectory location points is the shooting point position in microearthquake data.
In step 103, according to shooting point position coordinates and the micro-seismic monitoring recording geometry coordinate of microearthquake data, normal moveout correction process is carried out to ground array microearthquake data, eliminate due to the normal moveout that causes of propagation distance difference between different micro-seismic monitoring wave detector road, after normal moveout correction process microearthquake data medium wave to lineups substantially on a horizontal linear.
In step 104, surface array declines after the process of geological data normal moveout correction, the microearthquake track data that one signal to noise ratio (S/N ratio) chosen is relatively high, and other track data carries out cross correlation process with it.
In step 105, by the initial static moveout calculating arrival time in other track data and choose in high s/n ratio track data between arrival time, eliminate the initial static moveout in other track data, make the arrival time in other all track data basically identical with the arrival time chosen in high s/n ratio track data.
In step 106, all microearthquake track datas eliminating initial static moveout are carried out overlap-add procedure, obtain surface array by superposition and to decline the static correction standard track of geological data.
In step 107, all microearthquake track datas and static correction standard track carry out cross correlation process, with the arrival time in static correction standard track for standard, first break time in all microearthquake track datas is drawn close to static correction standard track, and reaction correction process is carried out to microearthquake data, retain the normal moveout that between different micro-seismic monitoring wave detector road, propagation distance difference causes, calculate the final static moveout of microearthquake data.
In step 108, final static moveout is brought in the microearthquake data of other period of this well, eliminates the static correction problem that near surface factor causes, improve the continuity of microearthquake validity event ripple to axle in the same way.
In step 109, export the surface array after static corrections processing and to decline geological data.
Fig. 2 is that the surface array chosen in the embodiment of the present invention declines earthquake primary data schematic diagram.Fig. 3 is the method adopted in the embodiment of the present invention in the present invention, carries out the microearthquake schematic diagram data after declining geological data static corrections processing along the surface array of well track search to the primary data chosen.As can be seen from Figure 3, surface array after static corrections processing declines geological data, retaining on the normal moveout basis that between different micro-seismic monitoring wave detector road, propagation distance difference causes, in the ripple of microearthquake validity event to axle in the same way, undulation problem obtains good solution, effectively eliminate the static correction problem that near surface factor causes, be conducive to the accurate pickup of microearthquake validity event and the accurate location of microearthquake focal point.
The above is only preferred embodiment of the present invention, not any type of restriction is done to the present invention, any those skilled in the art are not departing within the scope of technical solution of the present invention, make variation when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, the any simple modification done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (7)
1. to decline geological data static correcting method along the surface array of well track search, it is characterized in that: comprise the following steps:
Step 1: decline in geological data at surface array, when the unknown of shooting point position coordinates, the principle the strongest according to stack power, carries out optimum search along well track, determines the coordinate of shooting point position;
Step 2: normal moveout correction process is carried out to microearthquake data, and utilize cross-correlation stacking method, calculate the static correction standard track of microearthquake data;
Step 3: with the static correction standard track of microearthquake data for benchmark, eliminates in microearthquake data due to final static moveout that near surface factor causes;
Step: 4: be brought into by final static moveout in the microearthquake data of other period of this well, eliminates the static correction problem of microearthquake data, improves the positioning precision of microearthquake focal point.
2. to decline geological data static correcting method along the surface array of well track search as claimed in claim 1, it is characterized in that: the concrete steps of described step 1 are:
Decline geological data and the well track position coordinate of seismic monitoring recording geometry, the surface array that collects that declined by surface array all imports;
When during surface array declines geological data when the unknown of shooting point position coordinates, based on the maximum principle of stack power of all wave detector track datas, the arrival time of ground array micro-seismic monitoring wave detector is arrived along each well trajectory location points of well track optimum search, arrival time according to correspondence carries out normal moveout correction process to microearthquake data, and all track datas after normal moveout correction process are superposed, ask for the microearthquake data investigation energy value of each well trajectory location points, when stack power value reaches maximum, the normal moveout that the elimination that this well trajectory location points can be best causes due to propagation distance difference is described, achieve optimum normal moveout correction process, namely this well trajectory location points is the shooting point position coordinates corresponding to microearthquake data.
3. to decline geological data static correcting method along the surface array of well track search as claimed in claim 1, it is characterized in that: the concrete steps of described step 2 are:
According to shooting point position coordinates and the micro-seismic monitoring recording geometry coordinate of microearthquake data, normal moveout correction process is carried out to ground array microearthquake data, eliminate the normal moveout because propagation distance difference between different micro-seismic monitoring wave detector causes, after normal moveout correction process, microearthquake data medium wave is the straight line of a level substantially to lineups;
Choose the microearthquake track data that one signal to noise ratio (S/N ratio) after normal moveout correction process is relatively high, other track data carries out cross correlation process with it, the initial static moveout of cross-correlation calculating arrival time in other track data and choose in track data between arrival time;
Eliminate the initial static moveout of cross-correlation in other microearthquake track data, make the arrival time in other all track data basically identical with the arrival time chosen in track data, the all track datas eliminating the initial static moveout of cross-correlation are carried out overlap-add procedure, is obtained the static correction standard track of microearthquake data by superposition.
4. to decline geological data static correcting method along the surface array of well track search as claimed in claim 1, it is characterized in that: the concrete steps of described step 3 are:
In microearthquake data, all track datas and static correction standard track carry out cross correlation process, with the arrival time in static correction standard track for standard, arrival time in all track datas is drawn close to standard track, and calculates the standard track static moveout of microearthquake data;
Carry out reaction correction process to microearthquake data, retain the normal moveout that between different micro-seismic monitoring wave detector road, propagation distance difference causes, final static moveout eliminates the static correction problem that near surface factor causes.
5. to decline geological data static correcting method along the surface array of well track search as claimed in claim 1, it is characterized in that: the concrete steps of described step 4 are:
Final static moveout is brought in the microearthquake data of other period of this well, carries out the static corrections processing of microearthquake data;
Finally export the surface array after static corrections processing to decline geological data.
6. the surface array along well track search according to any claim of claim 1 or 5 declines geological data static correcting method, shooting point coordinate position it is characterized in that: when during surface array declines geological data, cannot be determined, based on the principle that stack power is maximum, optimum search is carried out along well track, determine the shooting point coordinate position on well track, wherein shooting point position is only positioned on well track.
7. the surface array along well track search according to any claim of claim 1 or 5 declines geological data static correcting method, it is characterized in that: the surface array calculated declines the microearthquake data that the final static moveout of geological data is only adapted within the scope of this well, is not suitable for the microearthquake data of other well section; Final static moveout is brought in each fracturing section microearthquake data of this well, effectively eliminates the static correction problem of microearthquake data.
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