A Method for Quickly Establishing a 3D Velocity Model Near the Seabed in Shoal and Shallow Sea Areas
A velocity model, shallow sea technology, applied in seismology, seismic signal processing, geophysical measurement, etc., to achieve high computational efficiency, easy implementation, and simple computation.
Active Publication Date: 2021-02-26
CHINA PETROLEUM & CHEM CORP +1
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[0005] The purpose of the present invention is to provide a method for quickly establishing a three-dimensional near-bottom velocity model in shallow sea areas that solves the impact of various excitation and reception methods on inversion and avoids the need for ray tracing forward modeling simulation in the inversion process
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[0042] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below, and are described in detail in conjunction with the accompanying drawings.
[0043] Such as figure 1 as shown, figure 1 A flowchart of a method for quickly establishing a three-dimensional near-bottom velocity model for the shallow sea region of the present invention.
[0044] Step 1: Extract the first arrival information, and obtain the first arrival travel time, shot point coordinates, and receiver point coordinates from the seismic data;
[0045] Step 2: Extract the common midpoint gather;
[0046] Step 3: Calculate the slope of the first arrival travel time in the common center point gather. The calculation formula of the slope is as follows:
[0047]
[0048]Among them, Δt represents the difference of first arrival travel time of adjacent traces, Δx represents the difference of offset distance of adjacent ...
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The invention provides a method for quickly establishing a three-dimensional near-bottom velocity model in shallow sea areas, including: extracting first arrival information and extracting a common center point gather; calculating the slope of the first arrival travel time in the common center point gather; judging whether the shot point is located at In the seawater layer, if it is, the shot point is corrected to the seabed; the velocity and depth of the turning point corresponding to each offset are calculated; the velocity at each depth is linearly interpolated to obtain the one-dimensional velocity model of the common center point; After processing all common center point domain gathers, the linear interpolation method is used to calculate the velocity values of the remaining grid points by using the one-dimensional velocity model of all common center points, and output the velocity model. The method of quickly establishing a three-dimensional near-bottom velocity model in the shallow sea area of the beach overcomes the influence of the seawater layer on ray propagation, eliminates the influence of multiple excitation and reception methods on the inversion results, and avoids the need for multiple ray tracing forward modeling in conventional methods simulated problems.
Description
technical field [0001] The invention relates to the technical field of surface velocity modeling in seismic exploration, in particular to a method for quickly establishing a three-dimensional near-bottom velocity model in shallow sea areas. Background technique [0002] In shallow sea areas, the surface velocity structure changes drastically, and there are tidal flats, silt, intertidal zones, etc. The complex surface velocity structure distorts the seismic reflection wave event, which seriously affects the final imaging quality. At present, the commonly used solution is to establish the surface velocity model with the first-arrival travel-time tomographic velocity modeling method, and then carry out static correction. The statically corrected seismic data is used for stacking imaging, so as to improve the accuracy of imaging. [0003] However, in shallow sea areas, there are multiple excitation and reception methods such as sea surface excitation, sea bottom reception, lan...
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IPC IPC(8): G01V1/38G01V1/30
CPCG01V1/303G01V1/38G01V2210/6222
Inventor 李凌云梁鸿贤秦宁孙朋朋王敬阁谷玉田毕丽飞
Owner CHINA PETROLEUM & CHEM CORP