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Cylindrical wave two dimensional earthquake exploration method
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A seismic exploration, cylindrical wave technology, applied in the field of seismic exploration
Inactive Publication Date: 2003-04-16
DAQING OILFIELD CO LTD
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[0003] The purpose of the present invention is to propose a cylindrical wave two-dimensional seismic exploration method that can effectively solve the problems caused by the horizontal superposition of the spherical wave common center and obtain more reflection information on the basis of the spherical wave seismic exploration method
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Embodiment 1
[0048] An observation system with a trace spacing of 25m, 300 trace receptions, an array length of 7500m, firing shots in the middle, and a shot spacing of 50m. When the shot point moves, the geophones also move accordingly.
[0049] Perform processing similar to the current conventional seismic processing, such as defining the observation system, setting trace heads, removing surface waves, surface consistent deconvolution, and absorbing energy compensation (without spherical wave diffusion compensation).
[0050] It is similar to the static correction, residual static correction, datum correction, etc. in the current conventional seismic processing.
[0051]After extracting the gathers of the common receiving points, they are directly superimposed, and the spherical waves are combined into cylindrical waves, and then the cylindrical wave diffusion is compensated, which is different from the horizontal superposition of the common center points.
[0052] Offset in the directio...
Embodiment 2
[0054] An observation system with a trace spacing of 50m, 160 receiving traces, an array length of 8000m, firing shots in the middle, and a shot spacing of 100m. When the shot point moves, the geophones also move accordingly.
[0055] Others are the same as the process of embodiment one.
[0056] When the inclination angle of the reflection layer is small, the method of horizontal stacking section migration is used to approximate the cylindrical reflection wave to the horizontal stacking spherical reflection wave, and the time migration is carried out with the horizontal stacking speed of about 150%.
[0057] Effectiveness analysis: Figure 4 The profiles obtained by cylindrical wave seismic processing method and Figure 5 Compared with the conventional profile, there are three advantages: first, the resolution is significantly improved, second, the breakpoints are clear, and third, the continuity of complex reflections is improved. Therefore, the application of cylindrical ...
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Abstract
The invention includes following operating procedures. The equal seismic excitation in expanding spread, the shooting in middle, the small interval between shootings and tracks carries out. The seismic data are collected by the receiving system. With the datum correction being treated, the superposition at the common receiving point is carried out. The spherical waves are combined as the reflection record sections in the finite cylindrical waves. Shifting the reflections of the cylindrical wave forms the shifted sections of the cylindrical waves. Comparing with the conventional method the invention method provides more and accurate underground geologic information, which is important to the researches of faultage, ore mass and abnormal flat spot.
Description
Technical field: [0001] The invention relates to the field of seismic exploration in oil and gas exploration and development, in particular to a cylindrical wave two-dimensional seismic exploration method. Background technique: [0002] The theoretical basis of the current two-dimensional seismic exploration method is the theory of spherical wave propagation. In order to improve the signal-to-noise ratio, multiple coverage acquisition methods are used in seismic exploration, and common center points are horizontally stacked during processing. The problems existing in the horizontal superposition of the common center point are that the speed is not suitable to be determined during normal time difference correction, and the speed is single at a certain time, which highlights the strong signal and suppresses the weak signal during superimposition; the second is that a certain reflection layer at the common center point has different offsets The amplitudes and frequencies of the...
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