川西坳陷深层岩石力学特征及其影响因素  

Characteristics and influencing factors of rock mechanics properties in deep formations of west Sichuan Depression

作　　者：高艳霞[1] 单钰铭[1] 刘维国[1] 周翔翔[2] 

机构地区：[1]成都理工大学"油气藏地质及开发工程"国家重点实验室,四川成都610059 [2]中国石化西南石油局油气测试中心,四川德阳618000

出　　处：《油气地质与采收率》2007年第6期23-25,112,共3页Petroleum Geology and Recovery Efficiency

基　　金：国家自然科学基金项目"岩石扩容现象的超声横波特征参数研究"(40472140)

摘　　要：为了确定川西坳陷深层须家河组致密砂岩的破裂特征及其影响因素,在模拟地层条件下,利用MTS岩石物理参数测试系统对该区岩石有关力学参数进行了测试。实验结果表明,随着孔隙度的增加,岩石抗压强度和静弹性模量降低;随着轴向差应力的增加,岩石波速先增加后降低;多数情况下,静泊松比大于动泊松比,动弹性模量大于静弹性模量。岩石经泥浆处理后塑性有所增加,抗压强度和弹性模量下降;除个别岩石外,多数岩石经泥浆浸泡后泊松比增大。For the purpose of understanding the fracture characteristics and influencing factors of tight sandstones in deep Xujiahe Formation of west Sichuan Basin, rock mechanical parameters in this area were measured using MTS rock physical automatic testing system under the conditions of simulated formations. Experiment results show that the compressive strength and elastic modulus of the rocks decrease along with the increasing in porosity. Both P -wave and S-wave velocities increase firstly and then decrease along with the increasing in additional axial stress. Generally,the static Poisson's of samples is greater than the dynamic Poisson's modulus,and the dynamic Young's modulus of all samples is greater than the statistic Poisson's modulus. After saturated by mud,the rock plastics increases with the compressive strength and elastic modulus decreases. Most rocks have larger Poisson's modulus after saturated by mud.

关 键 词：地层条件 波速 动静弹性参数 泥浆 川西坳陷 

分 类 号：TE21[石油与天然气工程—油气井工程]