温压条件下水饱和砂岩岩样纵波波速和衰减的测量与规律

Measurement and rule of velocity and attenuation for P-wave in core sampleof water-saturated sand in a condition of room temperature and confined pressure.

徐果明 ,孙新蕾 ,肖翔 ,吴永刚 ,赵宝忠 ,曲斌 .温压条件下水饱和砂岩岩样纵波波速和衰减的测量与规律 .石油地球物理勘探 ,2 0 0 2 ,37(1) :39～ 43在温度 2 8～ 80℃及 3.33～ 6 0 .0 MPa围压条件下 ,通过对大庆油田 19块水饱和砂岩岩样进行测量 ,得到了纵波波速参数 (v0 )、波速压力系数 (av)、波速温度系数 (bv) ,品质因子 (Q,包括纵波参数 Q0 )、压力系数 (aq)、温度系数 (bq)、压力系数的温度系数 (cq)等完整可靠数据 ;得到大庆 1号及 2号井岩样纵波波速及 Q与围压及温度之间的拟合公式。测量结果表明 ,在实验的温压范围内 ,水饱和砂岩岩样的纵波波速和 Q均与压力以及温度呈线性关系 。

Under the condition of 28～80℃ room temperature and 3.33～60.0 MPa confining pressure,and through measuring 19 core samples of water-saturated sand in Daqing Oilfield,a set of complete and reliable data,such as P-wave velocity(v 0),pressure coefficient of wave velocity(a v),temperature confficient(b v),and quality factor( Q,including P-wave quality factorQ 0),pressure coefficient(b q)and temperature coefficient for pressure coefficient(c q))has been got.The regression formula for P-wave velocity as well as quality factor Q as a function of temperature and confining pressure has been got for core samples of Daqing well No.1 and No.2.The measurement results show that the relation between P-wave velocity and quality factor Q vs pressure and temperature is linear and relation of pressure coefficient of the Q and temperature is also linear for core samples of water-saturated sand.