莺琼盆地纵横波地震参数及衍生参数的变化规律

VARIATIONS OF P AND S SEISMIC WAVE AND THEIR DERIVED PARAMETERS IN YING-QIONG BASIN

利用岩心实验室测试数据、全波列测井数据和地震资料对莺琼盆地纵横波地震参数及衍生参数的变化规律进行了分析和研究.含气岩心的弹性模量、纵横波速度比和泊松比比含盐水岩心低得多;砂岩的纵横波速度比和泊松比比泥岩低得多.当地层埋深超过2500m时,纵横波速度比、泊松比基本不受深度的影响.岩石密度和孔隙度的相关性很好;含盐水岩心的纵横波速度比与孔隙度的相关性很差;含气岩心的纵横波速度比与孔隙度的相关性稍好于含盐水岩心.

Variations of P and S seismic wave and their derived parameters in Ying Qiong basin are analyzed using core testing,all wave well log and seismic data.For a gas bearing core,the bulk module,V P/V S and Poisson ratio are much lower than those of a brine bearing core,and the V P/V S and Poisson ratio of sand are much lower than those of shale.In a formation deep over 2500 meter,the V P/V S and Poisson ratio are not influenced by depth.There is a very good correlation between rock density and porosity,but the V P/V S ratio of a brine bearing core is poor correlated to porosity.In a gas bearing core,however,a correlation of V P/V S to porosity is slightly better than that in a brine bearing core.