摘要
针对沉积物中水合物饱和度的测量问题,立足于时域反射技术(TDR)能够同时获得含水合物沉积物表观介电常数和电导率的优点,提出了一种基于介电常数/电导率双参数的水合物饱和度评价新方法。在分析介电常数和电导率测量原理的基础上,设计了四氢呋喃(THF)水合物模拟实验与参数测量系统以及实验方案;基于TDR测量响应分析了孔隙水电导率对水饱和的以及含水合物的模拟沉积物介电常数和电导率的影响;利用TDR获取的不同水合物饱和度条件下的介电常数测量数据对比分析了经典介电常数模型的性能,并以Lichteneker-Rother(LR)模型为原型建立了水合物饱和度与介电常数之间的关系模型,以阿尔奇公式为原型建立了基于TDR测量电导率的水合物饱和度计算模型。研究结果表明:采用LR模型和Maxwell-DeLoor模型能够较准确地描述TDR测量表观介电常数与水合物饱和度之间的关系;基于表观介电常数/电导率双参数的水合物饱和度联合评价方法为提高评价结果的准确度和可靠性提供了新途径。将来需要结合水合物储层实际特征开展模拟实验并进一步完善饱和度计算模型,将基于TDR双参数的饱和度联合评价方法推广应用到含天然气水合物沉积物。
Based on the advantages of time domain reflectometry(TDR)in measuring the apparent dielectric constant and conductivity of hydrate-bearing sediments simultaneously,a new method for hydrate saturation evaluation based on dual parameters of dielectric constant and conductivity was proposed.On the basis of analyzing the measurement principle of dielectric constant and conductivity,a simulation experiment and parameter measurement system of tetrahydrofuran(THF)hydrate was designed.The effects of pore water conductivity on the dielectric constant and conductivity of both water-saturated and hydrate-bearing sediments were analyzed based on the TDR measurement responses.The performance of classical dielectric constant models was compared and analyzed under different hydrate-saturation conditions.Finally,the relationship model between hydrate saturation and dielectric constant was established based on Lichteneker-Rother(LR)model and a hydrate-saturation calculation model with the TDR conductivity as input was built based on the Archie’s formula.It was demonstrated that:the quantitative relationship between the apparent dielectric constant and hydrate saturation can be accurately described by Lichteneker-Rother model and Maxwell-DeLoor model;the joint evaluation method of hydrate saturation based on the apparent dielectric constant and conductivity provides a new way to improve the accuracy and reliability of evaluation results.It is desirable to carry out simulation experiments according to the actual characteristics of hydrate reservoirs and improve the hydrate-saturation calculation model further,and then extend the joint-evaluation method based on TDR-measured dual parameters to gas-hydrate-bearing sediments for the future work.
作者
王亚军
魏伟
邢兰昌
韩维峰
高亮
WANG Ya-jun;WEI Wei;XING Lan-chang;HAN Wei-feng;GAO Liang(College of Information and Control Engineering,China University of Petroleum(East China),Qingdao 266580,Shandong,China;Department of Alternative Energy,PetroChina Research Institute of Petroleum Exploration&Development,Langfang 065007,Hebei,China)
出处
《新能源进展》
2021年第5期402-410,共9页
Advances in New and Renewable Energy
基金
山东省自然科学基金项目(ZR2019MEE095)
中石油“十四五”前瞻性基础性重大科技项目(2021DJ4901)
中国石油科技创新基金项目(2018D-5007-0214)
中央高校基本科研业务费专项资金项目(20CX05005A)。
