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Method for efficiently extracting attenuation quality factor in complex reservoir

A quality factor and complex technology, applied in measuring devices, instruments, scientific instruments, etc., can solve problems such as insufficient resolution, low accuracy of Q value estimation results, and difficulty in revealing deep information

Active Publication Date: 2018-12-07
HOHAI UNIV
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Problems solved by technology

The reason may be that most of the carbonate rocks are deeply buried, compact in lithology, and strongly reflect with the overlying clastic rock medium, resulting in difficulties in revealing deep information, insufficient precision of seismic data, insufficient resolution, and low accuracy of Q value estimation results.

Method used

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  • Method for efficiently extracting attenuation quality factor in complex reservoir
  • Method for efficiently extracting attenuation quality factor in complex reservoir
  • Method for efficiently extracting attenuation quality factor in complex reservoir

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Embodiment

[0088] The following is an embodiment of the present invention, illustrating the implementation process based on a method for efficiently extracting attenuation quality factors (Q values) in complex reservoirs.

[0089] The Longwangmiao Formation carbonate gas pool in the Moxi block of the Anyue gas field is geologically located in the paleo-uplift of the Central Sichuan Basin. The lithology is mainly composed of residual grain dolomite and residual grain dolomite. The average porosity of the reservoir is 4.24%, and the average thickness is 36m.

[0090] image 3 a is an example seismic trace data in the work area, the abscissa indicates the waveform amplitude, the ordinate indicates the time depth, and the dark dots indicate the waveform data in the target layer. Perform generalized S-transformation on all the data of the seismic trace, fine-tune the parameters p and λ according to the required resolution, and after a series of test adjustments, finally set p to 1 and λ to 1...

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Abstract

The invention discloses a method for efficiently extracting an attenuation quality factor in a complex reservoir, comprising the following steps of S1, reading the seismic record data of a survey lineand determining a target stratum; S2, transforming, by using generalized S transform, each seismic record on the survey line from the time domain into the time-frequency domain to obtain a time-frequency map; S3, determining the attenuation estimated frequency band of the target stratum; S4, calculating the centroid frequency of a spectrogram in a selected frequency band at each time depth basedon the time-frequency map; S5, estimating the Q value sequence of the target stratum by an improved centroid frequency shift method; and S6, processing the Q value sequence by a stratum stripping method; and S7, drawing an output Q value profile map. The method utilizes the generalized S transform and the improved centroid frequency shift method to improve the accuracy and stability of the Q valueestimation.

Description

technical field [0001] The invention relates to the technical field of seismic attenuation factor extraction, in particular to a method for efficiently extracting attenuation quality factors in complex reservoirs, which introduces a generalized S transform to improve the frequency shift method to efficiently extract attenuation quality factors in complex reservoirs. Background technique [0002] The quality factor Q is a kind of attribute parameter that characterizes the attenuation characteristics of the medium, which is closely related to the lithology, fluid-bearing properties, porosity, permeability and other properties of the underground medium. In gas-bearing reservoirs, the sensitivity of attenuation characteristics to porosity and fluid is stronger than that of seismic wave velocity. Therefore, attenuation characteristics are often used in the research of reservoir prediction. [0003] The extraction methods of quality factor Q value are mainly divided into time doma...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/307
Inventor 巴晶凌文昌于庭余村张琳
Owner HOHAI UNIV
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