深部温度压力条件及其对砂岩力学性质的影响-岩石力学与工程学报.PDF

第 25 卷 第 6 期 岩石力学与工程学报 Vol.25 No.6 2006 年 6 月 Chinese Journal of Rock Mechanics and Engineering June ，2006 深部温度、压力条件及其对砂岩 力学性质的影响 孟召平，李明生，陆鹏庆，田军啟，雷 旸 ( 中国矿业大学(北京) 资源与地球科学系，北京 100083) 摘要：深部岩石处在一定的地质环境之中，其中温度和压力条件对岩石力学性质具有重要的影响。从温度和压力 条件入手，研究塔里木盆地塔河油田石碳系和三叠系砂岩所处的地温和地压环境；在此基础上，采用三轴岩石力 学测试系统研究砂岩的力学特性，剖析深部条件下不同温度和压力对砂岩力学性质的影响，建立砂岩力学性质与 温度和压力之间的相关关系。研究结果表明，砂岩力学强度与其所处的地温环境和地应力环境密切相关，表现为 岩石的刚度和强度均随温度的增大而降低，且砂岩破坏后其残余强度值也相对降低。而岩石的刚度和强度均随围 压的增大而增大，其破坏机制也均随围压的增大而发生转化。 关键词：岩石力学；温度和压力；深部条件；砂岩；岩石力学性质 中图分类号：TU 457 文献标识码：A 文章编号：1000 –6915(2006)06 –1177 –05 TEMPERATURE AND PRESSURE UNDER DEEP CONDITIONS AND THEIR INFLUENCES ON MECHANICAL PROPERTIES OF SANDSTONE MENG Zhaoping ，LI Mingsheng ，LU Pengqing ，TIAN Junqi，LEI Yang (Department of Resources and Geoscience，China University of Mining and Technology，Beijing 100083，China) Abstract ：Deep rock is located in definite geological environment. Therefore ，the conditions of temperature and pressure have especially important influence on the mechanical properties. Based on the conditions of temperature and pressure，the geothermic character and ground pressure of the deep formations of Carbonic and Triassic sandstone in Tahe oil field of Talimu basin are researched. The effects of different temperatures and pressures under deep conditions on mechanical property of sandstone are studied by using triaxial rock mechanics experimental system ；and the relative relationships between the mechanical properties of sandstone and temperature or confining pressure are established. It is shown that the