互层状盐岩储气库地表沉降机理与数值模拟研究
发布时间:2018-02-21 00:27
本文关键词: 盐岩储气库 地表沉降 蠕变模型 大地电场岩性探测 函数模型 数值模拟 出处:《郑州大学》2015年硕士论文 论文类型:学位论文
【摘要】:能源地下存储因其经济安全的特点成为首选的储备方法,而盐岩又因其蠕变性好、低渗透性、损伤自愈、储量丰富等特点成为能源地下存储的优良介质。目前,我国能源的整体局势不容乐观,而能源战略储备十分有限,地下能源储备库建设刚刚起步,发展前景十分广阔。关于盐岩储气库的理论研究和实际应用仍有许多问题亟待解决,其中沉降是影响盐岩储气库稳定的主要问题。针对河南省平顶山地区盐岩和泥岩互层,盐岩层厚度相对较小的特殊地质特点,首先在国内外研究成果基础进行了储气库沉降理论分析,提出了基于Schnute生长曲线的地表沉降计算函数模型,结合实测数据确定了模型参数,分析了沉降随时间的变化规律。然后采集纯盐岩、互层状盐岩、泥岩夹层进行蠕变试验和常规力学试验,确定了岩石的蠕变性能和物理力学参数。蠕变试验结果表明,受试加载条件和试验时间的限制,一定时间之内单轴和三轴状态下的蠕变均呈现初始和稳态蠕变两个阶段,泥岩的稳态蠕变率较小,盐岩的变形占互层状盐岩变形的主要部分。并通过串联开尔文元件和理想粘塑性元件建立了相应的蠕变模型,蠕变模型和试验数据吻合较好,能够说明模型的适用性。另外,通过大地电场岩性探测技术得到盐岩地下溶腔的空间分布和几何形状,进行适当简化后分别建立了单腔、双腔和群腔数值计算模型。利用Fortran语言将蠕变模型程序化,并通过子程序接口与有限元软件相结合进行不同工况下的沉降变形计算,分析了不同储气压力、不同体积、不同埋深储气库在不同蠕变年限下的蠕变发展影响范围、沉降量及影响半径,确定了合理的溶腔间距。并通过数值计算结果和理论模型计算结果的对比分析,验证了理论计算模型的适用性。最后基于沉降计算结果提出了地面沉降的控制措施,为盐岩储气库的建设提供一定的参考。
[Abstract]:Energy underground storage has become the preferred storage method because of its economic and security characteristics, while salt rock has become an excellent medium for underground energy storage because of its good creep, low permeability, self-healing damage and abundant reserves. The overall situation of energy in China is not optimistic, but the strategic energy reserve is very limited, the construction of underground energy reserve is just beginning, and the development prospect is very broad. There are still many problems to be solved urgently in the theoretical research and practical application of salt rock gas storage. The settlement is the main problem affecting the stability of salt reservoir. In view of the special geological characteristics of salt rock and mudstone interbedded in Pingdingshan area, Henan Province, the thickness of salt rock layer is relatively small. Firstly, based on the theoretical analysis of gas reservoir settlement at home and abroad, a surface subsidence calculation function model based on Schnute growth curve is proposed, and the model parameters are determined based on the measured data. The variation law of settlement with time is analyzed, and creep tests and conventional mechanical tests of pure salt rock, interbedded salt rock and mudstone intercalation are carried out, and the creep properties and physical and mechanical parameters of rock are determined. The creep test results show that, Due to the limitation of loading conditions and test time, the creep of mudstone under uniaxial and triaxial state shows two stages: initial and steady creep, and the steady creep rate of mudstone is small. The deformation of salt rock accounts for the main part of the deformation of interbedded salt rock. The corresponding creep model is established by means of series Kelvin element and ideal viscoplastic element. The creep model is in good agreement with the experimental data, which can explain the applicability of the model. The spatial distribution and geometric shape of salt rock underground cavities are obtained by geoelectric field lithology detection technique. After proper simplification, numerical calculation models of single cavity, double cavity and group cavity are established respectively. The creep model is programmed by Fortran language. By combining subroutine interface with finite element software to calculate the settlement deformation under different working conditions, the influence range of creep development of different gas storage pressure, volume and depth under different creep years is analyzed. The reasonable space between the cavities is determined by the settlement and the radius of influence, and the results of numerical calculation and theoretical model are compared and analyzed. Finally, based on the results of settlement calculation, the control measures of land subsidence are put forward, which provides a certain reference for the construction of salt rock gas storage.
【学位授予单位】:郑州大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TE972.2;P642.26
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