摘要
致密油气层的物性(孔隙度和渗透率)较差.针对致密储层,目前常用的氦气法孔隙度测量方法存在两个不足:器壁压变性参数G定义不明确;膨胀前压力设置普遍偏小.本次基于氦气法孔隙度测量装置岩心室的应力应变力学分析和不确定度理论分析,开发了一种面向致密储层的氦孔隙度测量方法.本次提出的方法给出了器壁压变性参数G的解析式,并基于G的解析式推导出了新的孔隙度计算公式,将刻度系数减少到1个,简化了刻度过程.其次,基于不确定度理论得到的孔隙度测量不确定度表明:氦气法测量致密储层孔隙度的膨胀前压力大于2 MPa基本可以将孔隙度绝对误差控制在0.5%以内.与高压压汞法孔隙度测量结果对比发现,该方法测量孔隙度的相对偏差在14%以内,远低于常规氦气法测量孔隙度的相对偏差(50%).
The physical properties(i.e.,porosity and permeability)of tight reservoirs are poor.For the samples of the tight reservoirs,the conventional helium method has the following two shortcomings:The definition of parameter G is not clear and the pro-pressure in the measurement is usually low.Based on the analysis of stress-strain in the helium porosity measurement device and uncertainty analysis theory,a method for measuring helium porosity of the tight reservoir is developed.This method derives the formula of G and proposes the new expression of porosity,which decreases the number of the calibration parameters and simplifies the calibration process.The porosity measurement based on uncertainty theory demonstrates that the absolute porosity error can be within 0.5% when the pressure before expansion is higher than 2 MPa.Compared with the high-pressure mercury method,the relative error of the new helium method is lower than 14%,which is much lower than 50% of the traditional helium method.
作者
韩学辉
张浩
毛新军
徐登辉
郭慧英
江佳洋
罗兴平
王振林
刘智桢
李靖
罗振
HAN XueHui;ZHANG Hao;MAO XinJun;XU DengHui;GUO HuiYing;JIANG JiaYang;LUO XingPing;WANG ZhenLin;LIU ZhiZhen;LI Jing;LUO Zhen(School of Geoscience,China University of Petroleum(East China),Qingdao 266580,China;Research Institute of Petroleum Exploration and Development,Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;Exploration Department of Xinjiang Oilfield Company,PetroChina,Karamay 834000,China;Research Institute of Experiment and Detection of Xinjiang Oilfield,Karamay 834000,China;Karamay OnCores Energy Technology Company Limites,Karamay 834000,China)
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2021年第1期289-297,共9页
Chinese Journal of Geophysics
基金
国家科技重大专项(2017ZX05009001)
国家自然科学基金(U1562108)联合资助.
关键词
氦气法孔隙度
致密储层
应力应变力学分析
不确定度
测量压力
Helium porosity
Tight reservoir
Analysis of stress-strain mechanics
Uncertainty
Measurement pressure
