Method for calculating elevations above sea level for bidirectional layer replacement floating datums
A datum, elevation technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of unclosed space and inapplicability, and achieve the effect of reducing calculation errors
Active Publication Date: 2017-12-05
CHINA PETROLEUM & CHEM CORP +1
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[0006] To sum up, the methods used to calculate the altitude of the floating datum in the prior art have the following deficiencies: first, it can only be applied to survey areas with flat terrain, and cannot be applied to complex survey areas with severe topographical fluctuations near the surface; is the space is not closed
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[0029] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.
[0030] figure 1 It shows a schematic flow chart of the method for calculating the altitude of the floating datum of the two-way layer replacement provided by the embodiment of the present invention, as shown in figure 1 As shown, the method includes the following steps:
[0031] Step S1: Determine multiple observation points, and obtain the geodetic coordinates and actual elevation of each observation point.
[0032] Among them, ...
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The invention discloses a method for calculating sea-level elevation of bidirectional layer replacing floating reference surface. The method comprises following steps: determining multiple observation points and obtaining geodetic coordinate and real elevation of each observation point; obtaining the relative coordinate of each observation point through coordinate transformation according to the geodetic coordinate of each observation point; obtaining the speed of low-velocity layer and elevation of high-velocity layer top interface according to the relative coordinate of each observation point; obtaining under spall time from actual earth surface to the high-velocity layer top interface by calculating the speed of low-velocity layer and elevation of high-velocity layer top interface; replacing the actual low-velocity layer with replacement velocity, and keeping the under spall time unchanged, obtaining simulated terrain elevation of each observation point according to the under spall time, the elevation of the high-velocity layer top interface, and the replacement speed; performing smoothing to the simulated terrain elevation of each observation point to obtain sea-level elevation of the observation point relative to the simulated terrain floating reference surface. According to the method, through bidirectional layer replacing, the calculation error is greatly reduced.
Description
technical field [0001] The invention relates to the technical field of oil and natural gas seismic exploration in complex prospecting areas, in particular to a method for calculating the altitude of a two-way layer replacing a floating datum. Background technique [0002] In seismic data processing, an intermediate reference surface is introduced for velocity analysis, which averages the static corrections of the datum planes of all shot points and receiver points in the CDP gather to obtain the low-frequency component of the static correction, which is It is the floating datum. The floating datum is a time plane, which is the starting point of the velocity spectrum. [0003] When performing variable velocity mapping of seismic data, interpreters generally select floating datums as the datum for structural interpretation when mapping with fixed datums, because the starting point of the velocity spectrum used by interpreters is the floating datum. However, interpreters need...
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IPC IPC(8): G01V1/30
CPCG01V1/303
Inventor 李宗杰刘连升费建博杨子川邢春兰张志禹杨威李赋斌闫艳琴张开拓陈松周刚
Owner CHINA PETROLEUM & CHEM CORP