Application method of lateral velocity variation small-scale area reflection coefficient formula
A reflection coefficient and small-scale technology, applied in the field of oil and gas field exploration, can solve the problems that pre-stack inversion cannot be applied, and achieve the effect of simple and practical method
Active Publication Date: 2014-01-15
PETROCHINA CO LTD
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In the case of small-scale lateral variable velocity, is the existing reflection coefficient expression applicable, and how can it effectively describe the real situation of the subsurface medium? At present, there are few researches on the approximate expression of reflection coefficient in the case of small-scale lateral variable speed in the world, and they mainly start from the perspective of anisotropy, and modify the approximate expression of Zeoppritz equation according to each anisotropic parameter, which cannot be applied to actual AVO analysis and prestack inversion
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[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.
[0040] Generally speaking, most of the thick-layer homogeneous models are now used for AVO analysis, and the reflection coefficient can be obtained through approximate equations. The fact that the velocity of the subsurface medium may vary in the lateral direction, if ignored, may lead to an inaccurate prediction of the reservoir. Previous studies on the reflection coefficient of the lateral variable speed body are less, and there is no approximate formula for the reflection coefficient in the case of lateral small-scale variable speed, so there is no mature model. The present invention simula...
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The invention provides an application method of a lateral velocity variation small-scale area reflection coefficient formula. The application method comprises the following steps of: performing numerical simulation by establishing a double-layer medium model and utilizing a finite difference full wave field numerical simulation algorithm; performing AVO (against violence organization) analysis on an obtained numerical simulation result; establishing a theoretical expression of the lateral velocity variation small-scale area reflection coefficient formula; and determining an undetermined coefficient according to an AVO analysis result of the obtained numerical simulation result on the basis of the theoretical expression and finally getting the lateral velocity variation small-scale area reflection coefficient formula. The method for calculating width and elasticity parameters of a lateral velocity variation small-scale area through the formula is simple and practical, and the relation between the variation of a reflection coefficient and the width and the elasticity parameters of the small-scale area can be effectively described.
Description
technical field [0001] The invention relates to the field of oil and gas field exploration, in particular to a method for applying a laterally variable velocity small-scale body reflection coefficient formula. Background technique [0002] In the early 1980s, Ostrander (1982) first proposed to identify gas-bearing sandstones by using the reflection coefficient changing with the incident angle. He noticed that the reflection amplitude of gas-bearing sandstones increases with the increase of offset distance, and the reflection amplitude of water-bearing sandstones increases with the offset distance. The discovery of this phenomenon enriches the technology of hydrocarbon detection. Ostrander's work marks the emergence of practical AVO (Amplitude Versus Offset) technology. For more than 30 years, AVO technology has become a hot research topic. SEG (The Leading Edge) magazine has published many albums to discuss AVO theory, methods and technology. Gassaway et al. used AVO (Ampli...
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IPC IPC(8): G01V1/28G01V1/30G01V1/36
Inventor 李胜军雍学善高建虎杨午阳刘卫华
Owner PETROCHINA CO LTD