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Seismic data processing method and device for keeping kinematics characteristics of seismic wave field
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A technology of kinematic characteristics and seismic data, applied in the direction of seismic signal processing, etc., can solve the problems of reducing the accuracy of seismic data processing, unable to effectively maintain the kinematic characteristics of seismic wave field, etc., and achieve the effect of improving accuracy and accuracy
Active Publication Date: 2015-04-08
PETROCHINA CO LTD
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[0009] The main purpose of the embodiments of the present invention is to provide a seismic data processing method and device that maintains the kinematic characteristics of the seismic wave field, so as to solve the problem that the existing seismic data processing flow cannot effectively maintain the kinematic characteristics of the seismic wave field, thereby reducing the seismic data Dealing with Accuracy Issues
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Embodiment 1
[0044] Embodiments of the present invention provide a seismic data processing method that maintains the kinematic characteristics of the seismic wave field, such as figure 2 As shown, the method includes:
[0045] Step 201, pick up the first arrival wave data in the seismic data;
[0046] Step 202, inverting the near-surface velocity model by using the travel time tomography method and the waveform tomography method according to the first arrival wave data picked up;
[0047] Step 203, calculating the matching static correction value of the shot-check point according to the corresponding relationship between the picked-up first-arrival data and the fluctuation of the surface elevation measured in the field;
[0048] Step 204, determine the smoothing radius according to the expected speed picking interval, smooth the surface elevation measured in the field, and establish a smooth surface elevation model smoothed by small space operators;
[0049] Step 205, according to the s...
Embodiment 2
[0102] An embodiment of the present invention also provides a seismic data processing device that maintains the kinematics characteristics of the seismic wave field, preferably used to implement the method in the first embodiment above. Figure 9 is the block diagram of the device, such as Figure 9 As shown, the device includes:
[0103] The first arrival data pick-up unit 1 is used to pick up the first arrival data in the seismic data;
[0104]The near-surface velocity model inversion unit 2 is used to invert the near-surface velocity model through the travel time tomography method and the waveform tomography method according to the first arrival wave data picked up;
[0105] The matching static correction calculation unit 3 is used to calculate the matching static correction of the shot detection point according to the corresponding relationship between the first arrival wave data picked up and the surface elevation measured in the field;
[0106] The smooth surface eleva...
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Abstract
The invention provides a seismic data processing method and a device for keeping kinematics characteristics of a seismic wave field. The method comprises the steps as follows: carrying out inversion on a near-surface velocity model according to preliminary wave data; calculating matching static correction values of shot detection points according to fluctuation corresponding relation of the preliminary wave data and field measurement ground surface elevation; carrying out smoothing on the field measurement ground surface elevation and establishing a smooth ground surface elevation model; calculating corresponding terrain static correction values of the shot detection points when the field measurement ground elevation is changed into the smooth ground surface elevation, and combining the terrain static correction values of the shot detection points to carry out small disturbance time shifting processing on seismic data; embedding the near-surface velocity model into a whole velocity model to obtain a shallow velocity model; carrying out depth domain medium-deep velocity modeling based on the smooth ground surface elevation model and the shallow velocity model; establishing a new common imaging point or a common reflection angle set; establishing iteration of the common imaging point or the common reflection angle set to obtain the whole velocity model including shallow and medium-deep velocities; and carrying out prestack depth migration imaging through a prestack depth migration algorithm from the smooth ground surface elevation.
Description
technical field [0001] The invention relates to the field of seismic data processing, in particular to a seismic data processing method and device for maintaining kinematic characteristics of seismic wave field. Background technique [0002] The conventional seismic data processing process is based on the horizontal stacking of multiple coverage events, assuming that the surface and subsurface structures are horizontal, layered, and homogeneous media. For seismic data that do not satisfy this assumption (such as mountainous terrain), a series of processing methods such as terrain correction, low-velocity zone correction, and reflected wave residual static correction are used to correct it, and finally meet the needs of horizontal stacking. Therefore, terrain correction, low-speed zone correction and reflected wave residual static correction are the core of the routine processing flow. [0003] In the conventional seismic data processing flow, the purpose of topography and l...
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