致密砂岩岩石弹性各向异性实验研究  

Elastic anisotropy characteristics of tight sandstone rock

作　　者：黄开桦 熊健[1] 王万彬 黄裕萌 王佳[1] HUANG Kaihua;XIONG Jian;WANG Wanbin;HUANG Yumeng;WANG Jia(State Key Laboratory of Oil and Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu Sichuan 610500,China;Exploration Department,Xinjiang Oilfield,PetroChina,Karamay Xinjiang 834000,China)

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]中国石油新疆油田公司勘探事业部,新疆克拉玛依834000

出　　处：《石油化工应用》2019年第11期33-36,48,共5页Petrochemical Industry Application

基　　金：西南石油大学大学生课外开放实验项目，项目编号：KSZ182

摘　　要：为研究致密砂岩岩样声波速度、弹性各向异性的影响因素及特点,选取四川盆地须家河组致密砂岩并在xx、yy、zz三个方向上钻取相同规格的岩心,利用实验仪器测量岩石的声学参数、基本物理参数,研究了含水饱和度、围压等因素对致密砂岩样品的声波速度、弹性各向异性参数的影响。研究结果表明岩样的纵横波声波速度随围压的增大而增大,随含水饱和度增加而增大。在干燥条件下,纵波各向异性参数γ随着围压增大而减小,横波各向异性参数ε随着围压增大而减小;在饱和水条件下,弹性各向异性参数随围压的变化规律与干燥条件时一致,不同的是变化幅度更加明显,说明了围压及饱和度对致密砂岩岩心各向异性影响较大。To investigate the characteristics and relevant influencing factors of acoustic wave velocity and elastic anisotropy for tight sandstone samples,selecting the tight sandstone from the Xujiahe formation in the Sichuan basin and drilling the core of the same specification in xx,yy,and zz directions,to measure the acoustic characteristics and basic physical parameters of rocks with experimental instruments,the effects of water saturation and confining pressure on the acoustic velocity and elastic anisotropy parameters of tight sandstone samples were also studied.The results shown that the P-S waves velocity increases with increasing confining pressure and also increase with increasing water saturation.Under dry condition,the P-wave anisotropicγcoefficient decreases as the confining pressure increases,and the S-wave anisotropy parameterεalso deduces as the confining pressure increases.In saturated water state,the general law is the same as the desiccated stated,but the phenomenon be-comes more obvious than the dry condition.

关 键 词：致密砂岩 各向异性 声波速度 弹性系数 

分 类 号：TE311[石油与天然气工程—油气田开发工程]