摘要
在实验室常温常压下测量了饱和模拟油的砂岩被矿化度为６×１０－３的盐水冲洗过程中的声速和声衰减，并观察其声学特性变化规律。从中得出：纯砂岩（人造岩样）随着含水饱和度的升高，含油饱和度的降低，其纵波速度逐渐升高，横波速度逐渐下降，而天然岩样纵波速度逐渐下降。纯砂岩随着含水饱和度的升高、含油饱和度的降低，其纵波幅度衰减先是增大然后逐渐减小，含水饱和度在４０％～６０％之间时，声波幅度衰减达到最大值，即纵波幅度衰减比完全饱和油或水时要大。横波幅度衰减变化比较复杂，变化幅度较小。因此，有可能利用纵波信息识别油水层或水淹层。
Acoustic velocity and the attenuation of acoustic amplitude of the simulated oil saturated sand are measured in the lab under ambient temperature and pressure while the sample is being flooded by brine with salinity of 6×10 -3 . And the regularity of the changing acoustic properties is observed. With the increase of water saturation and the decrease of oil saturation, P wave velocity increases and S wave velocity decreases gradually in clean sand, but P wave velocity decreases gradually in natural sand. In clean sand, the amplitude attenuation of P wave first increases, and then decreases gradually with the increase of water saturation and the decrease of oil saturation. When the water saturation is in the range of 40%～60%, the attenuation of acoustic amplitude reaches its max value, i.e. the amplitude attenuation of P wave is greater than that in fully oil saturated or water saturated sand. The variation of the amplitude attenuation of shear wave is more complicated. Its amplitude variation is smaller. Thus, it is possible to identify oil bearing zone, water bearing zone or watered out zone with P wave information.
出处
《测井技术》
CAS
CSCD
北大核心
1997年第6期401-404,共4页
Well Logging Technology
关键词
砂岩
饱和油
水洗过程
声学特性
测井
sandstone water saturation sound velocity attenuation water drive rock sample laboratory testing
