干燥、饱油和饱水条件下砂岩地震波速的实验研究  

Experiments on seismic velocity of sandstones under dry,water and oil saturated conditions

作　　者：刘烨 王红才[2] 侯加根[1] 王怀民[1] 李阿伟[2] LIU Ye;WANG Hong-cai;HOU Jia-gen;WANG Huai-min;LI A-wei(College of Geosciences,China University of Petroleum,Beijing 102249,China;Institute of Geomechanics,Chinese Academey of Geological Sciences,Beijing 100081,China)

机构地区：[1]中国石油大学(北京),地球科学学院,北京102249 [2]中国地质科学院地质力学研究所,北京100081

出　　处：《地球物理学进展》2018年第4期1388-1394,共7页Progress in Geophysics

基　　金：中国地质调查局项目(DD20160060); 地质力学研究所基本科研业务费项目(DZLXJK201605)联合资助

摘　　要：岩石的地震波速度是浅部地层地下识别和区域构造研究的基础.哈密地区是我国重要的产油区域之一.本文利用Autolab2000岩石物性测试仪器,研究了0~200 MPa(约0~7000 m地下深度)下干燥、饱油与饱水三种状态时的砂岩地震波速度,得到了四组砂岩样品在三种状态下的纵横波速度与压力的拟合关系式.实验发现:在三种不同状态下,砂岩样品的纵横波速度都与压力呈对数关系;对于纵波,干燥下的波速明显小于饱油与饱水,但是饱油与饱水两种状态下岩石的纵波速度差异很小,饱水时的纵波速度略大于饱油;对于横波,低压下三种状态的地震波速度基本没有差异,在高压下,饱油与饱水样品的横波速度明显小于干燥样品.The seismic wave velocity of rock is the foundation of shallow stratigraphic recognition and regional tectonics. The Hami region is one of the most important oil producing areas in China.This paper research the measurement of seismic wave velocity of sandstones in Hami area under dry, water and oil saturated conditions in 0 - 200 MPa（ about 0 -7000 m underground depth）by using Auto Lab2000 rock mechanics test instrument and get the fitting relationship of P-wave and S-wave velocities with pressure between four groups of sandstone samples in the three states. The results show that： P-wave and S-wave velocities of sandstone samples have a logarithmic relation with the pressure in the three different conditions; The P-wave velocity of rock in dry condiction is significantly less than the oil and water saturated condictions,but the difference of the P-wave velocity of rocks under oil saturated condiction with the rocks under the water saturated condiction is very small, and the P-wave velocity of rock under the water saturated is slightly larger than the samples which are oil saturated;The S-wave velocity of sandstone samples is basically no difference in three states under low pressure. However the S-wave velocity of the samples which are saturated with oil and water is significantly less than the dry samples under high pressure.

关 键 词：哈密地区 砂岩 地震波速度 围压 干燥 饱油 饱水 

分 类 号：P315[天文地球—地震学]