Oil gas forecasting method
A prediction method and oil and gas technology, applied in the field of geophysical exploration, can solve problems such as affecting oil and gas prediction results, and achieve the effect of accurate prediction
Inactive Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP
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[0005] In order to solve the defect in the prior art that using the Fourier transform method to calculate the main frequency and absorption properties of the longitudinal wave signal in the frequency domain will cause less interference, thereby affecting the oil and gas prediction results, this application proposes a method that can accurately determine the main frequency and absorption properties of the longitudinal wave signal. and / or new oil and gas prediction methods for absorption properties
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[0009] The present invention will be described in detail below with reference to the accompanying drawings.
[0010] Such as figure 1 As shown, the present invention provides a method for oil and gas prediction, which method includes: 1) performing wavelet transform on the longitudinal wave signals at multiple locations in an area to obtain the wavelet transform coefficients of each longitudinal wave signal; 2) for each For the longitudinal wave signal, compare the wavelet transform coefficients of the longitudinal wave signal under different scale parameters σ, and determine the corresponding scale parameter σ when the wavelet transform coefficient is the largest best ; 3) For each longitudinal wave signal, the scale parameter σ of the determined longitudinal wave signal best Next, calculate the main frequency and / or quality factor of the longitudinal wave signal, which is a parameter reflecting the degree of vibration energy loss of the longitudinal wave signal; and 4) acco...
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The invention provides an oil gas forecasting method which comprises the steps of: 1, carrying out wavelet transform on longitudinal wave signals at a plurality of points on a region to obtain a wavelet transform coefficient of each longitudinal wave signal; 2, aiming at each longitudinal wave signal, comparing the wavelet transform coefficients of the longitudinal wave signals under different scale parameters theta, determining the corresponding scale parameter theta best when the wavelet transform coefficient is maximum; 3, aiming at each longitudinal wave signal, under the determined scale parameter theta best of each longitudinal wave signal, calculating the main frequency and / or quality factor of each longitudinal wave signal, wherein the quality factor is a parameter for reflecting the shake energy loss degree of the longitudinal wave signal; and 4, forecasting the potential region of oil gas distribution according to the calculated main frequency and / or quality factors of the longitudinal wave signals. In the invention, by using better time domain and frequency domain local change characteristics of a wavelet function, the main frequency and / or quality factors of the longitudinal wave signals under the best scale parameters can be figured out, and the main frequency and / or quality factors can accurately reflect the attenuation characteristics of the longitudinal wave signals, thereby being capable of accurately forecasting the potential region of the oil gas distribution.
Description
technical field [0001] The invention relates to the technical field of geophysical exploration, and in particular to an oil and gas prediction method, which is suitable for predicting the spatial distribution of oil and natural gas. Background technique [0002] In the 1970s, geophysicists discovered that hydrocarbons have a special response to high-frequency components, that is, the high-frequency components are severely lost, and the main frequency is significantly reduced. The dual-phase medium theory also confirms that oil and gas reservoirs are composed of solid framework and pore fluid, and the viscosity of the loose framework and pore fluid will cause the attenuation of P-waves. Biot (1961) and Wyllie (1961) studied the characteristics of longitudinal wave attenuation. The attenuation in the skeleton is caused by solid friction on the one hand and frequency-dependent on the other hand; while the attenuation in pore fluid is completely caused by frequency. [0003] Ho...
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IPC IPC(8): G01V1/28
Inventor 徐天吉程冰洁李显贵唐建明张虹陈本池叶泰然谯述蓉
Owner CHINA PETROLEUM & CHEM CORP