Calculating method and device of stratum quality factor

A technology of formation quality factor and calculation method, which is applied in the field of calculation method and device of formation quality factor, can solve problems such as easy overflow of calculation, large fitting error, poor fitting effect, etc.

Active Publication Date: 2018-08-31
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

In the prior art, when using the spectral ratio method to calculate the quality factor, it is usually necessary to obtain the seismic wavelet amplitude spectrum, but the actual seismic data, the seismic wavelet is unknown, and the process of obtaining the seismic wavelet requires complex mathematical calculations
For example, using the polynomial fitting method to obtain the seismic wavelet amplitude spectrum, the preset polynomial limits the shape of the wavelet amplitude spectrum, and the fitted seismic wavelet amplitude spectrum is always a single peak with the characteristics of the Lake wavelet The smooth curve, the fitting parameters...

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  • Calculating method and device of stratum quality factor
  • Calculating method and device of stratum quality factor
  • Calculating method and device of stratum quality factor

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[0187] (5) Design the cut-off frequency of the first low-pass filter according to the first bandwidth BW1, the basic principle is: the larger the bandwidth, the smaller the cut-off frequency, and the smaller the bandwidth, the larger the cut-off frequency. The specific implementation method can be as follows:

[0188] Set the reference value of bandwidth-cutoff frequency, which can be preset by the user according to the seismic data, and the default value can also be set as follows: the bandwidth 25Hz corresponds to the cutoff frequency 0.160s, the bandwidth 135Hz corresponds to the cutoff frequency 0.03s, and the bandwidth exceeds 25Hz~ For 135Hz, it is processed as 25Hz or 135Hz, and the cut-off frequency corresponding to the first bandwidth BW1 is as follows:

[0189] FEX1=0.160+(0.03-0.160)×(BW1-25) / (135-25)

[0190] (6) Process the first amplitude spectrum A1 with the first low-pass filter designed in step (5) to obtain the first estimated value AW1 of the amplitude spec...

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Abstract

The invention provides a calculating method and device of a stratum quality factor. The method comprises the following steps of according to seismic data, calculating a first amplitude spectrum corresponding to a first moment and a second amplitude spectrum corresponding to a second moment; carrying out low pass filtering processing on the first amplitude spectrum and the second amplitude spectrum, and acquiring the first estimation value and the second estimation value of corresponding seismic wavelet amplitude spectrums respectively; and according to the first estimation value and the secondestimation value, using a spectral ratio method to calculate the stratum quality factor. In each embodiment of the invention, tedious parameter settings and complex calculating processes during the process of estimating the quality factor by using the spectral ratio method in the prior art are reduced; the accuracy of a stratum quality factor calculating result is increased; the automation of stratum quality factor calculating is realized; manpower is saved; the interference of a human factor to an estimation result is reduced; and the method and the device are high-efficient and practical.

Description

technical field [0001] The application belongs to the technical field of geophysical exploration and processing, and in particular relates to a method and device for calculating formation quality factors. Background technique [0002] In a medium with absorption, the degree of energy loss can be considered fixed for every wavelength of seismic wave propagation, which is related to a physical property of the medium, which can be called the quality factor and can be expressed by the symbol Q . The quality factor Q reflects the absorption and attenuation of seismic waves by the subsurface medium, and is an important parameter for oil and gas detection and reservoir description. [0003] In the prior art, the spectral ratio method can usually be used to calculate the quality factor. In the prior art, when using the spectral ratio method to calculate the quality factor, it is usually necessary to obtain the seismic wavelet amplitude spectrum, but the actual seismic data, the se...

Claims

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Application Information

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IPC IPC(8): G01V1/30
Inventor 唐博文李合群吴艳辉邱宁齐玉玲陈宝孚
Owner BC P INC CHINA NAT PETROLEUM CORP
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