新疆哈密砂岩地震波速、各向异性及弹性性质的实验研究

发布时间：2018-01-18 02:30

本文关键词：新疆哈密砂岩地震波速、各向异性及弹性性质的实验研究　出处：《地球物理学进展》2017年03期 　论文类型：期刊论文

【摘要】：地震波是研究地球内部物质成分和结构最有效的工具之一.鉴于哈密地区油田对砂岩地震波性质研究的需求,本文在室内利用Autolab2000岩石物性测试设备,开展干燥、饱水及饱油条件下,砂岩X、Y、Z三个正交方向的弹性波速测试,得到不同压力下纵横波速随含水饱和度的变化规律,并在不同含水饱和度下分析了动态弹性常数(E和υ).结果表明:(1)波速与压力呈对数关系,相关系数在0.96以上;纵波速度与含水饱和度呈正相关,但随压力的增加,其增加速率会减小;横波速度在低压下基本不受含水饱和度影响,但随压力增加,其与含水饱和度呈负相关.(2)砂岩Z(垂直)方向波速最小;横波各向异性小于纵波;不同压力下,纵横波各向异性都是干燥大于饱油,并皆大于饱水状态.(3)恒定含水饱和度时,杨氏模量和泊松比皆随围压增加而增加,低压下(小于80 MPa,约3 km深度)增加速度快,而高压下(大于80 MPa)增速变缓;相同围压下,泊松比随含水饱和度增加而增加,而杨氏模量则有增有减.
[Abstract]:Seismic wave is one of the most effective tools to study the material composition and structure of the earth's interior. In this paper, the elastic wave velocities of sandstone are measured in three orthogonal directions under the conditions of drying, saturated water and oil under the condition of dryness, water saturation and oil saturation, using Autolab2000 equipment for testing the physical properties of rocks. The variation of longitudinal and transverse wave velocities with water saturation at different pressures is obtained, and the dynamic elastic constants (E and v) are analyzed under different water saturation conditions. The results show that there is a logarithmic relationship between wave velocity and pressure. The correlation coefficient is above 0.96; The longitudinal wave velocity is positively correlated with water saturation, but the increasing rate decreases with the increase of pressure. The shear wave velocity is not affected by water saturation at low pressure, but with the increase of pressure, it is negatively correlated with water saturation. 2) the wave velocity in Z (vertical) direction of sandstone is the smallest. The anisotropy of S-wave is smaller than that of P-wave. Under different pressures, both Young's modulus and Poisson's ratio increase with the increase of confining pressure. At low pressure (less than 80 MPA, about 3 km depth), the increase speed is fast, but the growth rate at high pressure (> 80 MPA) becomes slower. Under the same confining pressure, Poisson's ratio increases with the increase of water saturation, while Young's modulus increases and decreases.
【作者单位】：中国石油大学(北京)地球科学学院;中国地质科学院地质力学研究所;中石化新星湖北新能源开发有限公司;
【基金】：中国地质调查局项目(DD20160060)资助
【分类号】：P618.13;P631.4
【正文快照】： 1.中国石油大学(北京),地球科学学院,北京1022492.中国地质科学院地质力学研究所,北京1000813.中石化新星湖北新能源开发有限公司,武汉4300001.College of Geosciences,China University of Petroleum,Beijing 102249,China2.Institute of Geomechanics,Chinese Academey of G

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