摘要
该实验是以灰岩作为试样,用超声岩石参数测定仪测量此试样在不同的含水饱和度下纵、横波传播的速度,获得了纵、横波速度和纵、横波速度比与含水饱和度的关系:①纯灰岩和泥质条带灰岩的纵波速度V_P与含水饱和度S_W之间成正比关系;②横波速度V_S与含水饱和度S_W之间成反比关系;③当灰岩试样饱含水时,V_P/S_S的值均大于2;④当灰岩试样饱含气时,V_P/V_S的值均小于2;⑤在试样含水饱和状态时,纯灰岩(孔隙率小)的V_P/V_S值大于泥质条带灰岩(孔隙率大)的V_P/V_S值。我们利用上述关系,可鉴别地层中的流体含量。对岩石固结程度差的地层,还可用纵、横波速度比与含水饱和度的关系划分出油、气、水层。
Limestone was used as rock sample in the experiment.P-wave and S-wave velocities at different water saturations in rock sample were determined using ultrasonic rock-parameter tester.The following relations between P-wave velocity (S-wave velocity or ratio of P-wave velocity to S-wave velocity) and water saturation have been obtained: ·P-wave velocity (v_p) in pure limestone or striped argillaceous limestone is directly proportional to water saturation. ·S-wave velocity (v_s) is inversely proportional to water saturation. ·v_p/v_s is higher than 2 in the case of water-saturated limestone. ·v_p/v_s is less than 2 in the case of gas-saturated limestone. ·v_p/v_s in pure water-saturated limestone with small porosity is higher than v_p/v_s in striped water-saturated argillaceous limestone with great porosity. Fluid content in formation can be determined using these relations.Furthermore, oil,gas and water-bearing beds in poorly-consolidated formation can be ascertained using the relation between v_p/v_s and water saturation.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1990年第4期469-479,516,共12页
Oil Geophysical Prospecting
关键词
灰岩
含水饱和度
纵波速度
横波速度
纵、横波速度比
孔隙率
limestone
water saturation
P-wave velocity
S-wave velocity
ratio of P-wave velocity to S-wave velocity
porosity
