长江大学学报（自然科学版）2025，Vol.22Issue(2)：12-17,27,7.
高温应力差条件下致密砂岩电性实验研究
Experimental study of the electrical properties of tight sandstones under high temperature and differential stress
摘要
Abstract
Tight sandstone gas reservoirs in the Tarim Basin are characterized by abnormally high temperature in deep layers and strong stress compression,which lead to the great influence of high temperature and differential stress on reservoir resistivity logging data.As a result,the evaluation of the electrical characteristics of tight sandstone reservoirs faces severe challenges.In order to quantitatively evaluate the influence of high temperature and differential stress on the electrical characteristics of tight sandstone reservoirs,this paper conducts rock electrical experiments under high temperature and differential stress,as well as compares the results of traditional rock electrical experiments at normal temperature and pressure.The results show that the resistivity,formation factor and lithology factor of tight sandstone samples with brine water under high temperature conditions increase linearly with increasing differential stress,while the cementation index decreases exponentially in the form of e with the increase of differential stress when the lithology factor is not mandatory equal to 1,and increases linearly with the increase of differential stress when the lithology factor is mandatory equal to 1.Compared with the traditional electric data of rock at normal temperature without differential stress,the lithology coefficient of tight sandstone increases obviously under high temperature and differential stress,while the cementation index decreases obviously.The results of this paper clarify the electrical characteristics and variation rules of tight sandstone under high temperature and differential stress,which can provide theoretical and experimental reference for the resistivity correction and oil bearing evaluation of tight sandstone reservoirs.关键词
应力差/高温高压/电阻率/岩石物理/致密砂岩Key words
differential stress/high temperature and high pressure/resistivity/rock physics/tight sandstones引用本文复制引用
许巍,魏然,阎泽华,李浩,郑亚萍,唐军..高温应力差条件下致密砂岩电性实验研究[J].长江大学学报（自然科学版）,2025,22(2):12-17,27,7.基金项目
国家自然科学基金项目"复杂裂缝介质多尺度声波测井响应机理实验及智能评价方法研究"(42474177) （42474177）
油气资源与探测国家重点实验室开放基金项目"油气储层电频谱探测特性及导电机理研究"(PRP/open-1704). （PRP/open-1704）
