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Method for predicting extended elastic impedance inversion fluidity-containing probability

A technology that expands elastic impedance and prediction methods, applied in the field of reservoir prediction in geophysical exploration, and can solve problems such as interference

Active Publication Date: 2014-05-21
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0011] Aiming at the problem that the division of gas layer or water layer distribution area in the prior art is greatly disturbed by human factors, the present invention proposes a prediction method for the probability of fluidity inversion of extended elastic impedance

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  • Method for predicting extended elastic impedance inversion fluidity-containing probability
  • Method for predicting extended elastic impedance inversion fluidity-containing probability
  • Method for predicting extended elastic impedance inversion fluidity-containing probability

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Embodiment Construction

[0022] Exemplary embodiments according to the present invention will now be described more fully with reference to the accompanying drawings.

[0023] figure 2 is a flow chart illustrating a method for predicting fluidity probability based on extended elastic impedance inversion according to an exemplary embodiment of the present invention.

[0024] refer to figure 2 , in step S201, the extended elastic impedance (EEI) value of each sample at different angles is calculated from the logging data to obtain the EEI(θ) j , where θ represents the angle of the sample and j represents the sample number. Specifically, typical wells can be selected in the target area, and analysis samples can be determined for the gas and water layers of the target interval in the selected typical wells, and the extended elastic impedance EEI values ​​at different angles can be calculated for the determined analysis samples to obtain the EEI (θ) j .

[0025] Due to the change of the air layer an...

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Abstract

The invention aims at solving the problem that partition of air layer or water layer distributing areas is largely interfered by human factors and providing a method for predicting the extended elastic impedance inversion fluidity-containing probability. The method comprises the steps: calculating extended elastic impedance energy efficiency index (EEI) values of different incident angles of each sample according to logging information to obtain EEI (theta) j; calculating EEI differential values delta EEI j of different angles of each sample; applying a column diagram to analyze a distribution range of the delta EEI j to obtain distribution ranges of the probabilities of air layers or water layers so as to establish quantitative analysis templates of probability distribution of the air layers or the air layers and the water layers; inverting seismic data to obtain extended elastic impedance inversion cross sections of the different angles, removing non-reservoir sections and only reserving inversion data of reservoir sections; utilizing the inversion data of the reservoir sections to calculate extended elastic impedance differential value data; and applying established quantitative analysis templates to the extended elastic impedance differential value data to obtain air-containing probability data, and performing time window analysis to object layers to obtain air-containing probability plane analysis results.

Description

technical field [0001] The invention relates to the field of reservoir prediction in geophysical exploration, more specifically, to a prediction method for fluid-bearing probability inversion of extended elastic impedance. Background technique [0002] Pre-stack elastic impedance (EI) inversion is to use different offset (or incident angle) gather data and shear wave, longitudinal wave, density and other logging data to jointly invert a variety of elastic parameters related to lithology and oil and gas. , to comprehensively judge the reservoir physical properties and oil and gas properties. The conventional elastic impedance method has the following problems: the calculated value varies greatly on the scale with the change of angle, and the calculated reflection coefficient is not stable. Due to the AVO (Amplitude versus Offset) effect, the inverted EI value changes drastically with the incident angle. The magnitudes of the elastic wave impedance values ​​at different angl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V1/30
Inventor 熊艳赵园王玉雪章雄李丽平
Owner BC P INC CHINA NAT PETROLEUM CORP
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