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Method and device for predicting hydrocarbon saturation of reservoir

A saturation and reservoir technology, applied in the field of petroleum geophysical exploration, can solve the problems of inability to predict hydrocarbon saturation in reservoirs, and inability to meet high-precision quantitative hydrocarbon saturation prediction.

Pending Publication Date: 2020-07-07
PETROCHINA CO LTD
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Problems solved by technology

[0005] The embodiment of the present invention provides a solution for predicting the hydrocarbon saturation of reservoirs, which solves the problem that in the prior art, it is impossible to predict the hydrocarbon saturation of reservoirs quantitatively alone, and it cannot meet the requirements of high-precision quantitative hydrocarbon saturation prediction. question

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  • Method and device for predicting hydrocarbon saturation of reservoir
  • Method and device for predicting hydrocarbon saturation of reservoir
  • Method and device for predicting hydrocarbon saturation of reservoir

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Embodiment Construction

[0025] 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 of the embodiments of the present invention, not all of them. 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.

[0026] The inventors found that neither the conventional AVO analysis technique nor the seismic attenuation characteristic analysis technique can quantitatively predict reservoir hydrocarbon saturation at present. It is difficult to quantitatively detect the composition and content of the hydrocarbons, resulting in the inability to meet the requirements of high-precision quantitative hydrocarbon saturation prediction.

[0027] Based on the above ...

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Abstract

The invention provides a method and device for predicting the hydrocarbon saturation of a reservoir, and the method comprises the following steps: obtaining the physical information of a rock matrix of the reservoir; determining a frequency-varying zero offset seismic amplitude attribute and a frequency-varying attenuation attribute according to the reservoir rock matrix physical information; according to the frequency-varying zero offset seismic amplitude attribute and the frequency-varying attenuation attribute, determining the saturation distribution characteristics of the subsection hydrocarbon; and determining the hydrocarbon saturation predicted by the reservoir according to the segmented hydrocarbon saturation distribution characteristics, the frequency-varying zero offset seismic amplitude attribute and the frequency-varying attenuation attribute. According to the method, the final reservoir hydrocarbon saturation distribution rule is obtained by integrating the prediction results of the frequency-varying zero offset seismic amplitude attribute and the frequency-varying attenuation attribute, the prediction precision of the reservoir hydrocarbon saturation under different geological background conditions is improved through segmented frequency constraint prediction, and the exploration risk is reduced.

Description

technical field [0001] The invention relates to the technical field of petroleum geophysical exploration, in particular to a method and device for predicting the hydrocarbon saturation of a reservoir. Background technique [0002] With the deepening of petroleum exploration, the target of oil and gas exploration has changed from conventional structural oil and gas reservoirs to lithologic oil and gas reservoirs, and reservoir prediction has entered the stage of quantitative detection from qualitative description. The AVO technology developed in the 1980s used the characteristics of the variation of amplitude with offset to qualitatively judge the type of gas-bearing sandstone reservoirs, which greatly improved the accuracy of reservoir prediction. However, the conventional AVO technology based on the elastic Zoeppritz equation only considers the elastic properties of underground rocks, ignoring the influence of the velocity dispersion of seismic waves on the reflected energy...

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Application Information

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IPC IPC(8): G01V1/30
CPCG01V1/306G01V1/307G01V2210/624G01V2210/63
Inventor 王磊陈彬滔徐中华石兰亭方乐华史忠生薛罗马轮史江龙
Owner PETROCHINA CO LTD
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