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A method for establishing a quality factor three-dimensional attenuation model

A quality factor and attenuation model technology, which is applied in seismology, seismology, instruments and other fields for logging records, can solve the problems of affecting the accuracy of seismic data processing quality of oil and gas reservoirs, and cannot describe the attenuation characteristics of near-surface media to seismic waves. , to achieve the effect of improving stability, time resolution and frequency resolution

Active Publication Date: 2019-11-12
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Due to the limitations of acquisition methods, the vertical seismic section data can only be used to obtain the quality factor of the middle and deep layers, that is, the quality factor at a depth of 800m to 3000m from the ground, while the depth of the near-surface is about 60m from the ground, and the near-surface It also has an attenuation effect on seismic waves, so the quality factor 3D attenuation model of the existing technology cannot describe the attenuation characteristics of near-surface media to seismic waves, which affects the processing quality of seismic data and the accuracy of oil and gas reservoir description

Method used

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Embodiment 1

[0035] In order to solve the problems existing in the existing technology, such as figure 1 As shown, the embodiment of the present invention provides a method for establishing a quality factor three-dimensional attenuation model, and the method includes:

[0036] Step 1: With the excitation well as the center, a number of receiving wells of different depths are arranged around the excitation well with the same radius, and an excitation point is set at the wellhead and bottom of the excitation well to fire in sequence to excite seismic waves. A geophone is arranged at the bottom of each receiving well to receive the seismic wave information from the excitation point;

[0037] Among them, the depths of multiple receiving wells increase sequentially, the deepest receiving well among the multiple receiving wells has the same depth as the excitation well, and the depths of the excitation well and multiple receiving wells are within the depth range of the near-surface formation;

[0038] ...

Embodiment 2

[0113] The embodiment of the present invention provides a method for establishing a quality factor three-dimensional attenuation model, the method including:

[0114] Step 1: There are also multiple excitation points between the excitation point at the head of the excitation well and the excitation point at the bottom of the well. The multiple excitation points are arranged at intervals, and the shots are fired in sequence at the multiple excitation points, and the bottom hole detection of each well is received The device receives the seismic wave information from each of the multiple excitation points;

[0115] For example, in this embodiment, if the depth of the excitation well is 50m, the excitation points are set from the bottom of the excitation well, and one excitation point is arranged every 1m. The excitation points from the bottom of the well to the well head are excitation point 0 and excitation point respectively. 1 Up to the excitation point 50, with the excitation well...

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Abstract

The invention discloses a method for establishing a quality factor three-dimensional attenuation model, belonging to the seismic data processing field. The method for establishing a quality factor three-dimensional attenuation model comprises steps of using general S transformation to convert travel time corresponding to primary wave received by a detector of each depth from a time-space domain to a time-frequency domain to obtain an amplitude spectrum of the primary wave received by the detector of each depth, using a spectral ratio method to perform comparison on the amplitude spectrums of the primary waves of the detectors of every two adjacent depths, using a shaping regularized operator to perform smooth constraint processing on an amplitude spectral ratio, obtaining a quality factor of a corresponding stratum between the detectors of every two adjacent depths according to the amplitude spectral ratio after smooth constraint processing, and calculating to obtain a near-surface quality factor three-dimensional attenuation model of a whole working area according to the quality factor of the corresponding stratum between the detectors of every two adjacent depths. The three-dimensional attenuation model calculated through the method can better describe characteristics of attenuation on the seismic wave by a stratum medium of the near surface.

Description

Technical field [0001] The invention relates to the field of seismic data processing, in particular to a method for establishing a quality factor three-dimensional attenuation model. Background technique [0002] During the propagation of seismic waves in underground media, the absorption of underground media will cause the attenuation of seismic waves. Quality factor is an important parameter describing the attenuation characteristics of seismic waves in the process of propagation in underground media. The accuracy of the quality factor is important for the quality of seismic data processing. It has an important impact on the accuracy of oil and gas reservoir description. At different depths underground, the underground medium is different, so the quality factor is different. The quality factor three-dimensional attenuation model can well describe the quality factor at different depths underground. [0003] The current quality factor three-dimensional attenuation model is establis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30G01V1/42
CPCG01V1/307G01V1/42
Inventor 叶秋焱李景叶刘喜恒葛子建杜维良秦凤启张树森柳溪王瑞贞汪剑李海东朱敏
Owner PETROCHINA CO LTD
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