摘要
在前人研究成果的基础上,从Gassmann理论、测井数据以及岩石物理实验3个方面着重对水驱4D地震监测的岩石物理基础进行了分析。基于Gassmann方程的理论计算表明,油气层纵波速度一般低于水层的速度,油水层存在一定的速度差异。来自大庆、胜利以及新疆等地的部分测井资料表明,油层速度略低于水层速度,但这种差异并不明显。部分岩石物理实验测量结果也表明,高孔隙度、高渗透率岩石一般具有饱油纵波速度低于饱水纵波速度的特点;然而,也有相当一部分岩石物理测量结果与4D地震实施的理论基础相抵触。因此,进一步深入细致地开展水驱4D地震监测的岩石物理基础研究是非常必要的。
Rock physics properties of 4-D seismic monito-
ring in water flooding reservoirs are emphatically
studied by comprehensively analyzing previous au-
thors' results from Gassmann equation computation
and logging data analysis and rock physical measure-
ment. The computation results based on Gassmann
equation show that velocities of rocks saturated with
oil and water are different and P-wave velocity of
rock saturated with oil or gas usually is lower than
the velocity of the same rock fully saturated with wa-
ter. The logging data from different oil fields, such
as Daqing, Shengli, Xinjiang and so on, also show
the same velocity regulation, but the velocity differ-
ence is not so obvious. Some laboratorial data from
sandstone with higher porosity and permeability also
show the characteristics, but the other laboratorial
data show opposite velocity regularity to the compu-
tation results from Gassmann equation. Therefore, it
is very necessary for 4D seismic monitoring in water-
flooding reservoirs to research and measure systemi-
cally the rock physical properties.
出处
《石油物探》
EI
CSCD
2004年第3期309-312,共4页
Geophysical Prospecting For Petroleum
基金
国家自然基金(40174018)
