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Method and device for estimating quality factor based on zero-offset vertical seismic profile data

A vertical seismic profile and quality factor technology, applied in the field of physical exploration, can solve problems such as difficult to guarantee the quality factor accuracy, and achieve the effect of improving stability and accuracy

Active Publication Date: 2017-05-10
PETROCHINA CO LTD
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Problems solved by technology

However, in actual operation, it is found that the quality factor estimated by the exponential method often has large errors, and the accuracy of quality factor estimation is difficult to guarantee.

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  • Method and device for estimating quality factor based on zero-offset vertical seismic profile data

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Embodiment Construction

[0058] After studying the index method, the inventor found that the reason for the deviation of the precision of the quality factor estimated by the index method is that there are unknown coefficients in the index method, and the existence of the unknown coefficient affects the performance of the index method. Therefore, the inventor found after research that the unknown coefficient in the exponential method can be obtained first, and then the quality factor can be estimated, thereby eliminating the influence of the unknown coefficient on the stability and accuracy of the method. By estimating the quality factor in this way, the quality factor can be further improved. Stability of quality factor estimates.

[0059] In the embodiment of the present invention, a method for estimating the quality factor based on zero-biased VSP data is proposed, such as figure 1 shown, including the following steps:

[0060] Step 101: Determine the transmission coefficient between two adjacent V...

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Abstract

The invention provides a method and a device for estimating a quality factor on the basis of zero offset VSP (vertical seismic profile) data. The method comprises the following steps: on the basis of an interval velocity of a seismic wave in the zero offset VSP data, determining a transmission coefficient between two adjacent VSP channels; and determining the transmission coefficient as an indeterminate coefficient in an index method objective function and according to the index method objective function, estimating the quality factor. The method and the device solve the technical problem of lower stability and accuracy of estimating the quality factor due to the indeterminate coefficient in the process of estimating the quality factor by adopting an index method in the prior art and achieve the technical effect of improving stability and accuracy of estimating the quality factor.

Description

technical field [0001] The invention relates to the technical field of physical exploration, in particular to a method and device for estimating a quality factor based on vertical seismic profile (Vertical Seismic Profiling, VSP) data. Background technique [0002] The earth's medium is not completely elastic. When seismic waves propagate in the earth's medium, the absorption caused by the viscosity of the medium will cause the energy attenuation and velocity dispersion of the seismic wave. The inherent attenuation characteristics of this medium are usually described by the quality factor Q. Due to the existence of the quality factor, the attenuation of high-frequency energy of seismic waves is more severe than that of low-frequency energy, and the propagation velocity of high-frequency components is faster than that of low-frequency components. The resolution of the data is reduced, which increases the difficulty of fine interpretation of seismic data. [0003] In view of ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/28G01V1/36
Inventor 于永才孙夕平张明崔兴福侯连华
Owner PETROCHINA CO LTD