三重介质页岩气藏渗流模型解的相似结构

发布时间：2018-05-19 04:16

本文选题：页岩气藏 + 三重介质　；参考：《西华大学》2017年硕士论文

【摘要】：鉴于传统页岩气藏双重介质模型在描述页岩气渗流过程中的局限性,本文将基质系统分为有机质基质系统和非有机质基质系统,并考虑基岩中存在微裂缝,运用页岩气藏的物性规律及渗流机理,建立了不考虑吸附解吸的页岩气三重介质渗流模型;综合运用Laplace变换与相似结构理论,得到该三重介质模型在Laplace空间中的井底拟压力,并证实其在不同外边界条件下具有相似结构;利用Stehfest数值反演方法将井底拟压力反演到实空间,通过绘制其特征曲线,综合分析了各主控参数对特征曲线的影响,并在此基础上做进一步的工作,探讨了考虑吸附解吸现象的三重介质渗流模型。将相似构造法创造性的融入油气藏工程中,不仅简化了油气藏渗流模型的计算过程,同时为相关试井分析软件的开发和编制提供新方向,新思路。将微裂缝引入页岩渗流模型的同时又把基质分为有机质基质和非有机质基质,对于传统模型做出的这些改进将使得渗流模型更加符合页岩气的实际渗流过程从而大大提高模型的准确性与实用性。
[Abstract]:In view of the limitation of the traditional dual medium model for shale gas reservoir in describing shale gas seepage process, the matrix system is divided into organic matrix system and non-organic matrix system, and the microfractures in bedrock are considered. Based on the physical property and percolation mechanism of shale gas reservoir, a shale gas triple medium percolation model without considering adsorption and desorption is established, and the bottom hole pseudo pressure of the triple medium model in Laplace space is obtained by using Laplace transform and similar structure theory. It is proved that it has similar structure under different external boundary conditions, and the effect of main control parameters on the characteristic curve is analyzed synthetically by using Stehfest numerical inversion method to invert the bottom hole pressure into real space. On the basis of this, the seepage model of triple medium considering the phenomenon of adsorption and desorption is discussed. The creative integration of similar structural method into reservoir engineering not only simplifies the calculation process of seepage model of oil and gas reservoir, but also provides a new direction and new idea for the development and compilation of relevant well test analysis software. When microfractures are introduced into shale seepage model, the matrix is divided into organic matrix and non-organic matrix at the same time. These improvements made by the traditional model will make the seepage model more consistent with the actual seepage process of shale gas, thus greatly improving the accuracy and practicability of the model.
【学位授予单位】：西华大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE312

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