Time-lapse seismic AVA difference inversion method based on accurate Zoeppritz equation
A time-lapse seismic and equation technology, used in shale gas seismic exploration and reservoir parameter prediction, oil and gas fields, can solve problems such as the reduction of inversion accuracy, and achieve the effects of avoiding calculation errors, accurate estimation, and improving computing efficiency.
Inactive Publication Date: 2020-11-06
CHINA PETROLEUM & CHEM CORP +1
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[0004] Most of the methods introduced above are to use separate inversion and then make a difference to obtain difference data, or only the inversion of non-difference data, and it is impossible to directly invert the difference data to directly obtain the difference value of the three parameters
And most of these methods are based on the approximate formula of the Zoeppritz equation to construct the forward calculation operator, which will reduce the inversion accuracy to a certain extent
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[0040] The present invention will be further described below in conjunction with accompanying drawing.
[0041] figure 1 shows the time-lapse seismic AVA difference inversion method 100 based on the precise Zoeppritz equation provided by the present invention, as figure 1 As shown, the method 100 includes the following steps:
[0042] S110, establishing a difference data forward modeling model based on the precise Zoeppritz equation;
[0043] S120. Perform time-lapse seismic AVA multi-wave joint difference inversion on the difference data forward modeling model based on Bayesian theory to obtain changes in reservoir elastic parameters.
[0044] Specifically, aiming at the discontinuous distribution of time-lapse seismic parameters to be inverted, a more reasonable prior model is introduced. The invention assumes that the elastic parameters obey the Gaussian distribution, and at the same time adds a vertical block constraint item that obeys the differential Laplace distribution...
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The invention provides a time-lapse seismic AVA difference inversion method based on an accurate Zoeppritz equation. The time-lapse seismic AVA difference inversion method based on the accurate Zoeppritz equation comprises the following steps of 1, establishing a difference data forward model based on the accurate Zoeppritz equation, and 2, performing time-lapse seismic AVA multi-wave joint difference inversion on the difference data forward model based on a Bayesian theory to obtain changes of oil reservoir elastic parameters. Through the inversion method, calculation errors caused by an approximate formula can be well avoided, difference inversion is carried out by directly utilizing difference data, the problem of calculation amount caused by respective inversion subtraction is solved,the operation efficiency is effectively improved, and processing of actual data is facilitated.
Description
technical field [0001] The present invention relates to oil and gas fields, shale gas seismic exploration and reservoir parameter prediction methods, and more specifically, to a time-lapse seismic AVA differential inversion method based on the precise Zoeppritz equation. Background technique [0002] Time-lapse seismic reservoir monitoring technology can measure the change of seismic response caused by oil and gas exploitation, and then quantify these changes with the help of seismic inversion technology to obtain the change of reservoir elastic parameters, and finally obtain the oil and gas content of the reservoir according to the petrophysical relationship Changes in physical parameters such as saturation, pressure, and temperature provide important seismic information for the distribution of remaining oil in the middle and late stages of development and fine description of reservoirs. Therefore, this technology is widely used in reservoir characterization, monitoring, and...
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CPCG01V1/50
Inventor 廉培庆段太忠张文彪李景叶赵磊李蒙周林刘彦锋
Owner CHINA PETROLEUM & CHEM CORP