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Fluid identification method of frequency dispersion AVO related attribute inversion

A fluid identification and dispersion technology, applied in the field of seismic exploration, can solve problems such as poor results

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the existing dispersion AVO technology is not effective when applied in complex reservoirs, the present invention develops a fluid identification method for dispersion AVO correlation attribute inversion, and the method of the present invention is applicable to complex reservoirs The fluid identification of complex reservoirs improves the accuracy and stability of fluid identification in complex reservoirs

Method used

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  • Fluid identification method of frequency dispersion AVO related attribute inversion
  • Fluid identification method of frequency dispersion AVO related attribute inversion
  • Fluid identification method of frequency dispersion AVO related attribute inversion

Examples

Experimental program
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Effect test

Embodiment 1

[0065] well side channel inversion;

[0066] Such as Figure 1a , Figure 1b , Figure 1c as shown, Figure 1a The solid line represents the calculated value, the range delimited by the dotted line indicates Value, the ordinate represents the formation depth, and below 3740m is the reservoir section. Figure 1c The middle ordinate and Figure 1a Similarly, the black filled boxes represent the gas content percentage obtained from mud logging.

[0067] Such as figure 2 as shown, figure 2 The solid lines in are variable parameters value, the cross symbol on the solid line is the center point of the scanning window, and the scanning window is the 5 sampling points marked in the curve, that is, 4 circle points and 1 cross point, and the scanning radius of the scanning window is 2 sampling points; the dotted line The triangle symbol in is the standard deviation obtained from the longitudinal scanning results; the square symbol in the dotted line is the velocity attenuati...

Embodiment 2

[0070] profile inversion;

[0071] After the side channel inversion in Example 1 obtains a good application effect, this effect can be extended to the entire work area.

[0072] Such as Figure 3a , Figure 3b as shown, Figure 3a It is the seismic profile, and the black solid line indicates the logging position. Figure 3b It is the profile and mud logging results of dispersion AVO related attributes obtained by inversion. This well is currently the main gas producing well in a volcanic rock reservoir. Figure 3b The boxes in represent the gas saturation results obtained from mud logging. It can be seen that the inversion results are in good agreement with the mud logging results. There is gas production potential on both the left and right sides of the well. It is columnar in the vertical direction and adjacent in the plane, which is consistent with the current understanding that natural gas takes fractures as the main channel in complex reservoirs, migrates verticall...

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Abstract

The invention provides a fluid identification method of frequency dispersion AVO related attribute inversion. According to the method, inversion operation is performed on reservoir section seismic reflection coefficients, and longitudinal scanning and filtering analysis are performed on variable parameters obtained by the inversion operation so that frequency dispersion AVO related attributes are acquired, and fluid properties of reservoir sections are identified according to the frequency dispersion AVO related attributes. The method is suitable for complex reservoir section fluid identification so that the method has characteristics of being great in stability, high in identification accuracy, etc.

Description

technical field [0001] The invention relates to a fluid identification method in the field of seismic exploration, in particular to a fluid identification method for inversion of dispersion AVO correlation attributes. Background technique [0002] Fluid geophysical identification in complex oil and gas reservoirs is a difficult and key point in current geophysical exploration. Among the geophysical technologies for reservoir fluid identification, there are mainly AVO technology and spectrum analysis technology whose amplitude varies with offset. Among them, the AVO technology utilizes the spatial variation characteristics of the amplitude caused by the reservoir containing fluid, and the spectrum analysis technology utilizes the amplitude-frequency attenuation characteristics caused by the reservoir containing fluid. [0003] The combination of the two technologies is a new research direction of oil and gas detection in recent years, and the effectiveness of the method is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V1/30
Inventor 肖鹏飞王世星李弘张亚红
Owner CHINA PETROLEUM & CHEM CORP
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