基于原位渗透率试验反演岩石孔隙度的新方法

发布时间：2018-01-16 23:32

本文关键词：基于原位渗透率试验反演岩石孔隙度的新方法　出处：《岩土力学》2017年01期 　论文类型：期刊论文

【摘要】：为了获取岩石的原位孔隙度,在原位稳态渗透率试验的基础上,建立了以孔隙度和渗透率为主要参数的瞬态气体渗流模型,构造了基于遗传算法的孔隙度反演模型,分别采用原位渗透率试验中获取的岩石渗透率和瞬态压降数据作为已知量和观测数据,形成了基于原位渗透率试验反演岩石孔隙度的新方法。针对某场地的原位渗透率试验数据,分析了孔隙度对压降曲线的影响及孔隙度反演的可行性,编制了并行孔隙度反演程序,在大型计算机上对两个钻孔的孔隙度进行了反演并证明了反演结果的惟一性,最后通过数值模拟和实验室测量验证了反演结果的正确性。作为一种原位试验方法,对岩石及其孔隙结构破坏较小,其孔隙度反演结果比实验室测量法具有更好的区域代表性,反演结果可应用于气体泄漏行为模拟中。
[Abstract]:In order to obtain the in-situ porosity of rock, a transient gas seepage model with porosity and permeability as the main parameters is established on the basis of in-situ steady permeability test. The porosity inversion model based on genetic algorithm is constructed and the rock permeability and transient pressure drop data obtained from in-situ permeability test are used as known and observed data respectively. A new method for inversion of rock porosity based on in-situ permeability test is developed. The effect of porosity on pressure drop curve and the feasibility of porosity inversion are analyzed based on in-situ permeability test data of a site. A parallel porosity inversion program is developed to invert the porosity of two boreholes on a mainframe computer and to prove the uniqueness of the inversion results. Finally, the correctness of the inversion results is verified by numerical simulation and laboratory measurements. As an in-situ test method, the damage to the rock and its pore structure is relatively small. The porosity inversion results have better regional representation than the laboratory measurements. The inversion results can be applied to the simulation of gas leakage behavior.
【作者单位】：西北核技术研究所第五研究室;西安通信学院光通信实验室;
【基金】：国家自然科学基金(No.91330205)资助项目~~
【分类号】：TE312
【正文快照】： 岩石孔隙度是气体输运过程的关键参数,准确获取岩石孔隙度对于模拟和预测气体泄漏行为具有重要意义。目前,孔隙度的获取方法主要有两类:实验室测量和参数反演。实验室孔隙度测量方法有液体饱和法、注气法等[1-2],其具体过程包括现场取样、试件加工和试件测量等,虽然测量结果对

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