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Method for processing prestack offset grouped seismic data

A technology of seismic data and pre-stack migration, which is applied in the field of seismic exploration and can solve problems such as structural artifacts

Active Publication Date: 2015-03-11
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

When a certain offset in the reflection panel is missing, so that there are many corresponding voids, that is, the void is large, the adjacent seismic traces are likely to reflect the reflection information of different structural units, and their stratigraphic trends and dips may be completely different. , at this time, if the large holes are forced to be filled by interpolation, it will inevitably lead to structural artifacts

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  • Method for processing prestack offset grouped seismic data
  • Method for processing prestack offset grouped seismic data
  • Method for processing prestack offset grouped seismic data

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[0047] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0048] In addition, the steps shown in the flow diagrams of the figures may be performed in a computer system, such as a set of computer-executable instructions, and, although a logical order is shown in the flow diagrams, in some cases, the sequence may be different. The steps shown or described are performed in the order herein.

[0049] Such as figure 1 Shown is a flow chart of a method according to an e...

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Abstract

The invention discloses a method for processing prestack offset grouped seismic data. The method comprises the following steps: grouping the seismic data on the basis of a reflection surface element on a lower reflection surface of a ground layer, so as to acquire a first surface element data body; grouping the overall first surface element data body on the basis of offset, and inserting an estimated value in a cavity corresponding to a missing reflection surface element in each group, so as to acquire a second surface element data body; grouping the overall second surface element data body on the basis of the reflection surface element, and inserting an estimated value in a cavity corresponding to missing offset in each group, so as to acquire a third surface element data body; grouping the overall third surface element data body on the basis of the offset to acquire a fourth surface element data body, so as to carry out the prestack migration processing. The method not only can fill a smaller cavity when fewer seismic traces are missing, namely fewer cavities exit, but also can effectively fill a larger cavity when more seismic traces are missing, namely more cavities exit, so that the filling effect of the cavity, the distribution uniformity of the offset, and the quality of migration imaging are improved.

Description

technical field [0001] The invention relates to the technical field of seismic exploration, in particular to a method for grouping seismic data before pre-stack migration processing. Background technique [0002] At present, Kirchhoff (Kirchhoff) curved ray prestack time migration technology is widely used to process seismic data. At the heart of the technique is the computation of traveltime surfaces for subsurface scattering points. If the offset distribution of the target area is irregular, it will cause insufficient or excessive illumination of the underground sample points, making the amplitude distribution on the travel time surface uneven, resulting in common imaging points (common reflection bins) extracted after migration Gather amplitude distortion. Therefore, grouping is usually performed before prestack time migration processing of seismic data. The offset grouping principle is usually adopted. In the actual production process, when grouping seismic traces ac...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 陈习峰
Owner CHINA PETROLEUM & CHEM CORP
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