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Method for analyzing waveform similarity body curvature of seismic data

A technology of seismic data and analysis method, applied in the direction of seismic signal processing, etc., can solve problems such as the division of refractory sedimentary lithofacies, achieve accurate lithofacies distribution, good detection effect, and reduce the effect of impact

Active Publication Date: 2011-09-28
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] However, the current curvature analysis mainly uses the bending information caused by structural deformation, and is not sensitive to lateral changes in statistical parameters such as seismic waveforms and reflection structures caused by different sedimentary lithofacies, that is, it is difficult for curvature anomalies to form a good correspondence with sedimentary lithofacies. Therefore, the current curvature analysis cannot be directly used to guide the division of sedimentary lithofacies

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  • Method for analyzing waveform similarity body curvature of seismic data
  • Method for analyzing waveform similarity body curvature of seismic data
  • Method for analyzing waveform similarity body curvature of seismic data

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[0046] The specific implementation method of the present invention is as follows: (1) input three-dimensional post-stack seismic data body and the target layer that has been explained; (3) Select the appropriate calculation aperture to calculate the lateral variation and difference information of the seismic waveform to form a waveform similarity data volume; (4) Apply the trend surface analysis method to fit the curvature of the waveform similarity difference information in the waveform similarity volume, so as to obtain multiple three-dimensional volume curvature attribute data volumes that can accurately describe the boundaries of sedimentary facies belts; The attribute data body is processed by reverse layer leveling and restoration, so that the time (depth) information contained in it is consistent with the original 3D seismic data body; (6) Input the seismic time (depth) information of the underground target interval, combined with other available data Geological data, e...

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Abstract

The invention provides a method for analyzing waveform similarity body curvature of seismic data, which is a technology for processing and explaining oil seismic exploration data and realizes a method of accurately engraving sedimentary facies zone distribution by using the seismic data. The method for analyzing the waveform similarity body curvature of the seismic data comprises the following steps of: first, carrying out horizon flattening on original three-dimensional seismic data bodies by using a horizon flattening technology or a Wheeler automatic transform technology according to the described horizon so as to eliminate influences of a structure on lithofacies distribution; and then selecting a proper calculated aperture; figuring out a curvature based on a waveform similarity body by using a trend surface analysis method on the basis of extracting a waveform similarity information data so as to obtain multiple waveform similarity body curvature attribute data bodies. By using the method provided by the invention, strata bend, strata sedimentary facies or transverse variation of lithology caused by structure deformation can be effectively identified so as to provide a basis for describing distributional characteristics of reservoir lithology, indicating edges of the sedimentary facies zone and dividing a seismic facies zone.

Description

technical field [0001] The invention relates to the field of petroleum seismic exploration data processing and interpretation, and is a method for simultaneously detecting the stratum curvature caused by structural deformation in a seismic data body and the similarity degree of seismic waveforms between adjacent seismic traces through a curvature analysis method, and indicating geological structure characteristics and technology at the edge of sedimentary facies. Background technique [0002] Extracting sedimentary lithofacies from seismic data is an important part of oil and gas geophysical exploration. Sedimentary lithofacies refers to the synthesis of rocks or rock formations with certain lithological features, paleontological features and other signs, which can reflect the natural environment when sediments were formed. Therefore, sedimentary facies is the sum of the characteristics of sediments and their formation environment, revealing the depositional environment of ...

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Application Information

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IPC IPC(8): G01V1/30
Inventor 陈学华杨威贺锡雷
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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