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Fine identification method for sedimentary elements of waterway complex based on spectral decomposition and coherent attribute fusion process

A complex and spectrum decomposition technology, applied in the field of petroleum geological exploration, can solve the problems such as difficult to describe the sedimentary elements, difficult to identify the development stages of channels, and the resolution of seismic data cannot meet the requirements of predicting high-quality reservoir sand bodies of composite channels, etc. Achieve the effect of increasing prediction accuracy and reducing risk

Inactive Publication Date: 2019-01-01
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for finely identifying sedimentary elements of channel complexes based on spectral decomposition and coherent attribute fusion processes. The resolution of seismic data cannot meet the technical problems of predicting the demand for high-quality reservoir sand bodies in composite channels

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  • Fine identification method for sedimentary elements of waterway complex based on spectral decomposition and coherent attribute fusion process
  • Fine identification method for sedimentary elements of waterway complex based on spectral decomposition and coherent attribute fusion process
  • Fine identification method for sedimentary elements of waterway complex based on spectral decomposition and coherent attribute fusion process

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Embodiment Construction

[0036] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0037] The present invention relates to a kind of method based on frequency spectrum analysis (spectrum decomposition) and coherent body property fusion to describe compound channel sedimentary elements, which comprises the following steps:

[0038] (1) Data volume frequency analysis: analyze the frequency bands of seismic data according to the position where the compound channel target volume develops (such as figure 1 Shown), specify the minimum frequency, maximum frequency and dominant frequency of seismic data. This step determines the maximum and minimum thickness of identifiable sedimentary elements (natural dikes, point bars, single-stage channels, crevasse fans and sedimentary waves). Taking this example as an example, the highest frequency of the target is 50HZ, the lowest frequency is 10HZ, and the main frequency is 35HZ. Accordin...

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Abstract

The invention discloses a fine identification method for the sedimentary elements of a waterway complex based on spectral decomposition and a coherent attribute fusion process, comprising the following steps: (1) making frequency analysis of a data volume; (2) forming a tuned data volume; (3) establishing discrete time-frequency volumes; (4) carrying out coherent volume operation; (5) carrying outvolume fusion operation: carrying out superposed and fused display of the discrete time-frequency volumes corresponding to different sedimentary elements obtained in step (3) and the coherent volumesin step (4) to obtain coherent time-frequency volumes corresponding to different sedimentary elements; and (6) visually displaying the coherent time-frequency volumes by using an isochronal slicing or stratigraphic slicing technology, and reconstructing the vertical evolution process and planar distribution characteristics of single sedimentary elements of a target waterway complex to finely identify the sedimentary elements. Technical problems as follows are solved: the distribution of sand bodies of a deep-water complex waterway is complex; it is difficult to describe the sedimentary elements; it is difficult to identify the development phase of the waterway; and the resolution of seismic data is inadequate to predict the high-quality reservoir sand bodies in the complex waterway.

Description

technical field [0001] The invention relates to a method for finely identifying sedimentary elements of a channel complex based on a process of spectral decomposition and coherent attribute fusion, and belongs to the field of petroleum geological exploration. Background technique [0002] Channel complexes are the most important deep-water sedimentary reservoirs. Currently, the commonly used reservoir prediction method is to predict the distribution of sand bodies based on amplitude anomalies. Accurate identification and prediction of sedimentary elements in channel complexes is crucial. In the distribution area of ​​deep-water composite channels, fine identification and description of composite channel sedimentary elements can not only invert the evolution history of composite channels, but also predict the distribution of muddy interlayers, laying a solid foundation for the prediction of high-quality sand bodies and the development of oil and gas reservoirs. Base. [0003...

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Application Information

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IPC IPC(8): G01V1/28G01V1/30
CPCG01V1/28G01V1/30
Inventor 李全康洪全李欣杨婷逄林安曹向阳常迈李丹解东宁段俊刘励云姜慧超
Owner CHINA NAT OFFSHORE OIL CORP
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