【摘要】 渤海渤中26区明下段属河流相沉积,储层在地震剖面上具有强振幅亮点特征,利用这种特征进行储层预测已经取得了很大的成功。然而多年的勘探实践表明,油气层与水层均为强振幅特征,难以区分,给油田勘探开发带来很大的风险。本文考虑了地下介质的粘弹性质,利用粘弹性波动方程,说明了油气层与水层相比,对地震波有更强烈的衰减作用,提出利用储层顶底面反射振幅比值确定其含流体性质的方法,并在实际中取得了良好的应用效果。更多还原

【Abstract】 In Bozhong 26 area,Bohai sea,the sedimentary face of Lower Minghuazhen member is fluvial sediment,reservoirs have a bright-spot property of strong seismic amplitudes on the seismic profile,and by the bright-spot property reservoir prediction has made a great success.However,many years’ exploration practices in the area show that hydrocarbon reservoirs and water reservoirs are hardly to be distinguished,since they have the same property of strong seismic amplitudes,and this has brought great risk for the exploration and development of oilfield.This article takes account of the viscoelastic property of formation,and by the derivation of viscoelastic wave equation,we realize that hydrocarbon reservoirs have stronger attenuation to the seismic wave than water reservoirs.Then we present a method for hydrocarbon detection using the ratio of reflection amplitudes respectively from the top and bottom surfaces of reservoir,and obtain very good application effects in practice.更多还原