温度与有效应力对页岩扩散的敏感性研究  

Research on Sensitivity of Temperature and Effective Stress on Shale diffusion

作　　者：郭肖[1] 朱争[1] 辜思曼[1] 孟凡龙[2] 董文强 

机构地区：[1]油气藏地质及开发工程国家重点实验室西南石油大学,四川成都610500 [2]中石化胜利油田分公司,山东东营257000 [3]中油长庆油田分公司,宁夏银川750006

出　　处：《特种油气藏》2015年第2期74-77,154,共4页Special Oil & Gas Reservoirs

基　　金：国家"973"项目"页岩气多场耦合非线性渗流理论研究"(2013CB228002)

摘　　要：依据页岩扩散原理,采用页岩扩散系数测定装置,对龙山筇竹寺组多块页岩岩心开展扩散系数测定实验,分析温度与有效应力对页岩扩散系数的影响。研究表明:页岩扩散系数与温度呈较好的指数关系,扩散系数温度敏感指数与温度同样具有较好的指数关系,通过扩散系数温度敏感性评价,分析出弱、中等偏强、超强的温度敏感区;有效应力对页岩扩散系数有明显的抑制作用,随有效应力的增加,扩散系数下降,二者呈较好的指数关系;通过扩散系数应力敏感评价,分析出弱、中等的应力敏感区。该研究结果对于准确估算页岩气扩散损失量及资源评价具有重要意义。Based on the principle of shale diffusion,measurement device of shale diffusion coefficient is utilized to make experiments of diffusion coefficient for multiple cores in Qiongzhusi Formation in Longshan to analyze the influence of temperature and effective stress on shale diffusion coefficient. The research indicates that,the shale diffusion coefficient is in exponential relation to the temperature. The temperature sensitivity index of diffusion coefficient is in exponential relation to the temperature; through the evaluation on temperature sensitivity of diffusion coefficient,the weak,mid-strong and extra-strong sensitivity area of temperature is analyzed; effective stress has obvious inhibition effect on the shale diffusion coefficient; with the increase of effective stress,the diffusion coefficient decreases and the two have the good exponential relation to each other; through the evaluation on stress sensitivity of diffusion coefficient,the weak and medium stress sensitivity area is analyzed. The research results are of great significance to the accurate estimates of loss of shale gas diffusion and the assessment of resources.

关 键 词：温度 有效应力 页岩扩散 敏感性 扩散系数 

分 类 号：TE135[石油与天然气工程—油气勘探]