Novel direct extraction method of reservoir physical property parameters

Abstract

The invention provides a novel direct extraction method of reservoir physical property parameters. The method comprises steps of step 1, inputting seismic data, seismic wavelets, logging data and geologic horizons; step 2, based on counting of rock physical analysis, according to the logging data, establishing a quantification relation between a reservoir physical property parameter and an elasticparameter; step 3, deducting an approximate formula of physical property extraction, wherein the approximate formula comprises three parameters of the porosity degree, the mud quality contents and density; and step 4, by taking the prestack analysis as the main means, and combining the approximate formula of physical property extraction and a point-to-point equation, directly extracting the physical property parameter from the prestack data. According to the invention, the parameters of porosity degree, the mud quality contents and density of a reservoir can be inversed simultaneously; objectivity and accuracy of a physical property estimation result of the reservoir are improved; investment risks are reduced; and reliable basis is provided for estimation of oil and gas reserves and determination of the well location for geological workers.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a new method for directly extracting reservoir physical property parameters. Background technique [0002] Reservoir physical property inversion has always been a difficult and hot topic in reservoir geophysics research. Currently, there are two commonly used methods. One is seismic multi-attribute physical property inversion (Wu Mei et al., 2008; Wu Qiubo et al., 2011). The idea is Establish the quantitative relationship between physical properties and seismic attributes, and then invert the physical property parameters. The second is geostatistical property inversion (Sun Simin et al., 2007; Liu Baihong et al., 2009), mainly through the idea of ​​geostatistical random simulation to realize the physical property parameters inversion. Their disadvantages are that they all require a large amount of logging information, the mechanism of rock physics is not clear, and ...

AI Technical Summary

Problems solved by technology

Their shortcomings are that they all require a lot of logging information, the mechanism of rock physics is not clear, and they can only realize the inversion of a single physical parameter.

[0004] How to effectively extract reservoir physical parameters such as porosity, shale content, and water saturation from seismic data is a hot and difficult point in reservoir geophysics research. The current physical property extraction method is mainly realized through a two-step method, that is, first Invert the elastic parameters, and then calculate the physical parameters again through the elastic parameters. The disadvantage of this method is that the efficiency is low and the accuracy is not high

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