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Hydrocarbon detecting method and device based on wavelet energy attenuation features of generalized S transform

A technology of attenuation characteristics and energy attenuation, applied in the field of detecting hydrocarbons based on generalized S-transform wavelet energy attenuation characteristics, to achieve the effects of improving capabilities, reducing seismic attribute dimensions, and highlighting gas-bearing differences

Inactive Publication Date: 2013-10-16
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0003] However, practice shows that Fourier spectrum analysis is not effective for the analysis of all types of signals
However, there is no technical solution to apply the generalized S transform combined with the energy attenuation characteristics of seismic wavelets to study the distribution of oil and gas reservoirs, so as to obtain more information reflecting the heterogeneity of the subsurface medium, thereby improving the accuracy of reservoir prediction

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  • Hydrocarbon detecting method and device based on wavelet energy attenuation features of generalized S transform
  • Hydrocarbon detecting method and device based on wavelet energy attenuation features of generalized S transform
  • Hydrocarbon detecting method and device based on wavelet energy attenuation features of generalized S transform

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Embodiment 1

[0027] Before describing the embodiment of the present invention, it is necessary to introduce the time-spectrum-based wavelet energy absorption analysis theory of the present invention

[0028] 1. Energy decay in gas-filled pores

[0029] In most cases, the propagation speed of mechanical waves (such as sound waves) in partially saturated rocks is significantly higher than that in pure gases at the same pressure and temperature, which means that, compared with the gas in the pore space, The propagation process of mechanical waves in rocks is actually supersonic. Therefore, the instantaneous velocity on the pore wall can exceed the sound velocity of the gas in the pore. If the seismic wave propagation process in the rock skeleton and the gas in the skeleton is expressed as a heat exchange process, since the heat exchange varies linearly with the propagation velocity of the pore wall, and the propagation velocity of the pore wall varies linearly with the frequency, the energy ...

Embodiment 2

[0072] see figure 2 , figure 2It is the device for detecting hydrocarbons based on the generalized S-transform wavelet energy attenuation characteristics of the second embodiment of the present invention, and its theoretical basis is also derived from the theory described in the first embodiment. The device includes: a seismic trace time-frequency spectrum acquisition module 1 , a wavelet time-frequency spectrum acquisition module 2 , a main frequency spectrum acquisition module 3 , an attenuation coefficient acquisition module 4 , an energy attenuation feature acquisition module 5 and an exploration result acquisition module 6 . Among them, the seismic trace time-spectrum acquisition module 1 obtains the time-spectrum of each seismic trace according to the generalized S-transform after acquiring multiple seismic traces; the wavelet time-spectrum acquisition module 2 uses spectrum simulation technology to obtain Obtain the time spectrum of the wavelet at the corresponding s...

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Abstract

The invention provides a hydrocarbon detecting method and a hydrocarbon detecting device based on wavelet energy attenuation features of generalized S transform, belonging to the field of seismic data processing of petroleum geophysical exploration. The method comprises that a time-frequency spectrum of each seismic channel is calculated according to the generalized S transform; a time-frequency spectrum of a wavelet of a corresponding sampling point is obtained from the time-frequency spectrum of each seismic channel via a spectrum simulation technology; a dominant frequency of each wavelet is found out from the time-frequency spectrum of the wavelet; between a zero frequency and the dominant frequency of each wavelet, an attenuation coefficient QL of the wavelet in a charging hole portion at an objective exploration layer is calculated; between the dominant frequency and a cutoff frequency of each wavelet, an attenuation coefficient QG of the wavelet in a gassing hole portion at the objective exploration layer is calculated; and gas hydrocarbon exploration results in the objective exploration layer are obtained according to the acquired energy attenuation feature of each wavelet. Due to the fact that change speed of attenuation coefficients at high / low frequency end of the wavelet is directly related to whether a reservoir contains gas, the method and device of the invention can obviously improve success rate of gas hydrocarbon exploration.

Description

technical field [0001] The invention relates to a digital processing method for petroleum geophysical exploration seismic data, which is mainly used for hydrocarbon detection in oil and gas exploration, in particular to a method and device for detecting hydrocarbons based on generalized S-transform wavelet energy attenuation characteristics. Background technique [0002] Signal analysis is the research and characterization of the basic properties of signals, and it is an indispensable part in our theoretical research and practical engineering applications. A signal is usually a multivariate function, for example a seismic wavefield can be expressed as a function of variation in space and time. Time is one of the fundamental physical parameters, and the time description of the signal is the main means of study, however, it is important to study different representations of the signal if one wants to deeply understand the signal. From a mathematical point of view, by expandin...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 宋炜王润秋欧阳永林曾庆才黄家强宋雅莹左佳卉张小磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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