稠油岩心纵波速度变化规律的实验  

Research on P-wave velocity regularity in heavy oil core

作　　者：王新红[1] 李梦庚[1] 李增印[1] 余大祥[1] 刘太生[1] 马瑾[2] 曾正文[2] 

机构地区：[1]胜利石油管理局物探公司,257100 [2]国家地震局地质研究所

出　　处：《石油地球物理勘探》1994年第5期642-649,共8页Oil Geophysical Prospecting

摘　　要：为研究含稠油岩心的地震波速度与温度、压力等因素的关系，本文对胜利油田的几种稠油岩心进行了实验。实验结果如下：（1）在室温T=25℃、围压P=10MPa时：①砂样岩心的稠油含量H与纵波速度vp间呈抛物线关系；②含100％稠油砂样岩心的vp随T升高而单调递减，近似线性关系；③当P=30MPa时，则vp与T呈双曲线型关系。（2）温度对合稠油砂样的归一化纵波初动振幅的影响主要表现在中、低温阶段；砂样的归一化剪切模量G／Gmax随T升高而线性递减。（3）在T恒定时，原状油砂样的vp与P呈近似线性递增；且低温时围压效应比高温时显著。上述稠油岩心地球物理参数的变化规律，对提高校区稠油热采地震监测的精度具有重要意义。Different kinds of heavy oil cores from Shengli oil fields were respectively tested to determine the relations between seismic wave velocities and temperature or pressure etc. The researches lead to the conclusion:(1)When ambient temperature is 25℃,and country pressure is 10 MPa,. There is a parabolic relation between heavy oil content in sand core and Pwave velocity Vp.. VP in 100% heavy-oil saturated sand core monotonously decreases with temperature rise,which shows an approximate linear relation.. When the pressure is 30 MPa,the relation between Vp and temperature is characterized by a hyperbolic curve.(2)The influence of temperature upon the normalized initial amplitude of Pwave in heavy-oil sand core can be seen at mid and low temperatures.The normalized shear modulus G/Gmax of sand core declines linearly with the increase of temperature.(3)When temperature is constant,Vp shows an approximate linear increase with country pressure;and country pressure effect is more obvious at low temperatures than at high temperatures.The variation regulation of geophysical parameters in heavy oil cores is of greatimportance to accurate seismic monitoring of heavy oil thermal recovery in thisarea.

关 键 词：稠油 岩心 纵波 地震波 地震勘探 

分 类 号：P631.41[天文地球—地质矿产勘探]