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Petroleum-gas prediction method and system based on Zoeppritz equation approximate expression

An approximation and equation technology, applied in the field of petroleum geophysical exploration, can solve problems such as inability to predict oil and gas reservoirs, and achieve the effect of reducing risks and improving calculation accuracy

Active Publication Date: 2013-08-21
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

The fluid factors mentioned above cannot be used universally for oil and gas reservoir prediction in all actual situations

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  • Petroleum-gas prediction method and system based on Zoeppritz equation approximate expression
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  • Petroleum-gas prediction method and system based on Zoeppritz equation approximate expression

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Embodiment Construction

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0063] The invention proposes a new Zoeppritz equation approximation related to the reflection coefficient of the longitudinal and transverse wave modulus, which is mainly used to improve the accuracy of calculating the Russell fluid factor. On the premise of well logging and petrophysical analysis, multiple sensitive fluid factors are fully considered, including fluid factors calculated based on the Zoeppritz equation approximation of the present invention, so...

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Abstract

The invention provides a petroleum-gas prediction method and system based on a Zoeppritz equation approximate expression. The method comprises the steps of collecting logging data and prestack angle gather data of a current target area, extracting seismic wavelets according to the logging data and the prestack angle gather data, obtaining an inversion target function according to the prestack angle gather data, the seismic wavelets and the Zoeppritz equation approximate expression, confirming a target Zoeppritz equation approximate expression according to a first correlation, a second correlation and the Zoeppritz equation approximate expression, confirming longitudinal wave modulus and transverse wave modulus according to the inversion target function and the target Zoeppritz equation approximate expression, confirming fluid factors according to the longitudinal wave modulus and the transverse wave modulus of the stratum of the current target area, and integrally interpreting the fluid factors to obtain a petroleum-gas reservoir prediction result of the stratum of the current target area. Information of the longitudinal wave modulus and information of the transverse wave modulus can be stably gained, precision of the fluid factors is improved, and therefore risks of petroleum-gas reservoir prediction can be lowered.

Description

technical field [0001] The present invention relates to the technical field of petroleum geophysical prospecting, in particular to the prediction technology of petroleum and natural gas energy, specifically an oil and gas prediction method and system based on Zoeppritz (Zoeppritz) equation approximation. Background technique [0002] In the field of petroleum geophysical exploration technology, Amplitude versus Angle (AVA) inversion is to invert the subsurface lithology parameters by using the variation law of the reflected seismic wave amplitude with the incident angle, and then estimate the properties of reservoir rocks and fluids. Techniques for oil and gas forecasting. Zoeppritz (1919) used the continuity of displacement and stress on both sides of the reflection interface as boundary conditions to derive the reflection coefficient and transmission coefficient, which are the incident angle θ and the elastic parameters of the medium (such as: longitudinal wave velocity V ...

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Application Information

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IPC IPC(8): G01V1/28
Inventor 袁三一柴新涛施佩东王尚旭
Owner BC P INC CHINA NAT PETROLEUM CORP
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