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Method for detecting caves based on similarity lateral change rate of frequency domain dip angles

A technology of dip angle and detection method in the frequency domain, applied in seismic signal processing and other directions, can solve the problems of inability to distinguish the development characteristics of fractures and karst caves, inability to consider the relationship between adjacent multi-channels, and reducing the continuity of spatial resolution capabilities. The effect of abnormal response and good calculation results

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0002] Similarity lateral rate of change is the similarity of seismic traces. At present, the more popular algorithms are based on cross-correlation and similarity-based algorithms. The main defect is that it only calculates the correlation relationship between adjacent traces and central traces, and cannot consider the correlation between adjacent traces. The relationship between each other in terms of structure; the second is that the combination of correlation coefficients calculated in different directions has an average effect, and the more the number of calculation channels is, the more serious the average effect is, which reduces the spatial resolution and the continuity of abnormalities
[0004] The similarity lateral change rate is the similarity (coherence) of the seismic trace. At present, the technology development is relatively mature. The application in many work areas for many years shows that this method has a certain effect on detecting the abnormal points of the same axis on the seismic section. , but when the corresponding geological bodies are developed simultaneously with fractures and caves of different scales, this detection method can reflect the overall development of fractures and caves, but cannot distinguish the development characteristics of fractures and caves

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  • Method for detecting caves based on similarity lateral change rate of frequency domain dip angles
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  • Method for detecting caves based on similarity lateral change rate of frequency domain dip angles

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[0032] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0033] The similarity lateral change rate technology based on the frequency domain scanning dip attribute, first scan the dip in the frequency domain, and then use the high precision similarity detection method to find outliers with poor continuity, on this basis, carry out the similarity lateral change High-rate edge detection, eliminating abnormal points caused by fractures, so as to determine the development area of ​​karst-vug reservoirs.

[0034] Such as Figure 5 As shown, the specific implementation steps are:

[0035] (1) Frequency domain tilt scan

[0036] The frequency-domain seismic dip attribute is an attribute that uses the instantaneous phase spectrum to calculate the seismic dip. First, Hilbert transform is performed on the seismic data to obtain the Hilbert seismic trace, so that the seismic trace information is transformed from the time domain to t...

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Abstract

The invention provides a method for detecting caves based on a similarity lateral change rate of a frequency domain dip angles, and belongs to the field of petroleum geophysical exploration and development. The method comprises the following steps: 1, performing Hilbert transform on seismic data, transforming seismic data in a time domain to be in a complex domain to obtain Hilbert seismic traces, and calculating an instantaneous phase and a frequency domain dip angle of each Hilbert seismic trace; 2, performing similarity testing on the frequency domain dip angles obtained in the 1 step, and looking for abnormal points with poorer continuity, wherein relativity of all of the traces are calculated by adopting seismic wave field information, and uncorrelated abnormal boundaries are highlighted, so that fine terrane lateral non-uniformity and fracture features are identified, and respond features of cracks and the caves are amplified; 3, carrying out edge detection on similarity lateral change of the frequency domain dip angles to determine a development zone of a cave-type reservoir bed.

Description

technical field [0001] The invention belongs to the field of petroleum geophysical exploration and development, and specifically relates to a cave detection method based on the similarity lateral change rate of the frequency domain dip angle, which uses the frequency domain dip angle attribute results to carry out the edge detection scan of the similarity lateral change rate, which can be applied to Detection and identification of dissolved vugs in carbonate reservoirs in oilfield exploration. Background technique [0002] Similarity lateral rate of change is the similarity of seismic traces. At present, the more popular algorithms are based on cross-correlation and similarity-based algorithms. The main defect is that it only calculates the correlation relationship between adjacent traces and central traces, and cannot consider the correlation between adjacent traces. The relationship between each other in terms of structure; the second is that the combination of correlation...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/28G01V1/30
Inventor 丁娟曹辉兰王瑜
Owner CHINA PETROLEUM & CHEM CORP
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