油田注水过程中油藏物性变化规律研究

油田注水过程中不仅会引起储层流体饱和度的变化,而且会引起储层温度、压力的变化。它们的变化都会对纵波速度造成不同的影响,并会在时移地震剖面上有所反映。利用Biot Gassman方程,并结合各种经验公式,获取流体体积模量、岩石弹性模量,分析讨论了砂岩地层纵波速度随温度、压力、含水饱和度单独变化和共同作用的变化规律。通过对渤海油田砂岩地层纵波速度变化规律的研究,将有助于对该地区时移地震监测技术的发展和提高时移地震监测油藏变化的能力。

RESEARCH ON THE CHANGE LAWS OF THE OIL-POOL PHYSICAL PROPERTY IN THE PROCESS OF THE WATER FLOODING IN THE OILFIELD

The water flooding in the oilfield can cause the change of not only reservoir fluid saturation, but also reservoir temperature and pressure. These variations pose the different influences on the seis-mic velocity, and can be reflected on the time-lapse seismic profile.For analyzing and discussing the alone or integrated variety laws that temperature, pressure and saturation of water function cause, this paper makes full use of the Biot-Gassmann equation, and combine the other experiential formulas to get the volume modulus of fluid and the elastic modulus of rock. Throughthe study of the variety law of the velocity of sandstone strata of Bohai oilfield, its results will help us to acknowledge the time-lapse seismic monitoring technique,and improve the ability of recognizing the oil-pool’s change of the time-lapse monitoring in the area.