岩石形变及渗透率的非线性滞后演化特征  

Nonlinear hysteretic evolution characteristics of rock deformation and permeability

作　　者：唐杰[1] 王浩[1] 李健[1] 苏文涵 关键[2] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院,山东青岛266580 [2]中国石化胜利油田分公司物探研究院,山东东营257022

出　　处：《石油地球物理勘探》2017年第3期509-515,共7页Oil Geophysical Prospecting

基　　金：国家自然科学基金项目(41504097;41374123);山东省自然科学基金项目(ZR2013DQ020);中央高校基础研究经费项目(15CX08002A)联合资助

摘　　要：岩石等非均匀材料具有极强的非线性弹性行为和显著的滞后行为(应变—应力状态具有离散记忆效应)。主要通过储层岩样的应力—应变循环加载试验和渗透率滞后试验,结合理论分析研究岩石的非线性滞后特性。利用Preisach-Mayergoyz理论研究发现,准静态应力—应变状态、滞后特征和其伴随的离散记忆效应是岩石应力—应变关系所固有的性质,理论分析结果和实验结果有着较好的匹配效果,能较好地解释实验观测结果。Rocks and other non-uniform materials have strong nonlinear elastic behavior and significant hysteresis behavior(strain-stress state with discrete memory effect).In this paper,we use multilevel and multi-stage cyclic loading test combined with theoretical analysis to study nonlinear hysteresis characteristics of the rock.We introduce the concept of Preisach-Mayergoyz(PM)density to analyze static uniaxial compression tests at values well below the critical strength,and to characterize the elasticity of materials with hysteresis in their stress-strain relationship.The PM density can be deduced from a particular force protocol following basic data treatment.Hysteresis and discrete memory effect are inherent characteristics of rocks.The PM inversion procedure is tested for simulated stress-strain data.The final theoreticalanalysis can give better results to explain the experimental observations.

关 键 词：循环加载 滞后效应 离散记忆 非线性本构特性 模拟退火反演 

分 类 号：P631[天文地球—地质矿产勘探]