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Method for establishing quality factor three-dimensional attenuation model

A technology of quality factor and attenuation model, which is applied to seismology, measuring devices, instruments, etc. for well logging records, and can solve problems such as inability to describe the attenuation characteristics of seismic waves by near-surface media, and affecting the quality of seismic data processing and the accuracy of oil and gas reservoirs. , to achieve the effect of improving stability, improving time resolution and frequency resolution

Active Publication Date: 2017-10-27
PETROCHINA CO LTD
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  • Abstract
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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

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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, the method comprising:

[0036] Step 1: With the excitation well as the center of the circle, arrange multiple receiving wells of different depths around the excitation well with the same radius, and set an excitation point at the wellhead and bottom of the excitation well to fire sequentially 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 depth of the deepest receiving well among the multiple receiving wells is the same as that of the stimulating well, and the depths of the stimulating well and multiple receiving wells are located within the depth range of the ...

Embodiment 2

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

[0114] Step 1: Multiple excitation points are included between the excitation point at the wellhead of the excitation well and the excitation point at the bottom of the well, and the multiple excitation points are arranged at intervals. Shots are shot at multiple excitation points in sequence, and the detection of the bottom of each receiving well is The detector respectively receives the seismic wave information transmitted from each excitation point in the plurality of 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 wellhead are respectively excitation point 0, excitation point 1 until the e...

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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 the underground medium, the absorption of the underground medium will cause the attenuation of the seismic waves. The quality factor is an important parameter to describe the attenuation characteristics of the seismic wave in the process of propagation in the underground medium. The accuracy of the quality factor has a great impact on the quality of seismic data processing. It has an important impact on the description accuracy of oil and gas reservoirs. At different depths underground, the underground medium is different, so the quality factor is different. The three-dimensional attenuation model of quality factor can well describe the quality factor at different depths underground. [0003] The current quality factor thre...

Claims

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Application Information

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Patent Type & Authority Applications(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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