河道砂岩体地震反射特征及形成条件分析

SEISMIC REFLECTION CHARACTER OF THE CHANNEL SAND SEDIMENTARY AND THE CONDITION OF ITS FORMING

物探局勘探二处

具有一定规模的河道砂岩体能为目前的地震方法所识别。河道砂岩体在横切河道的地震剖面上一般表现为充填反射状的顶平底凹的单透镜体;后期的差异压实作用可使一些河道呈下凹上凸的眼球状反射结构。

At present,the fair-sized body formed with the channel sand sedimentary could be discovered and recognized by seismic technology. On seismic profile cross-cut the channel, it generally presents as a lenticle with flat top and concave bottom and has the character of infilling in reflection. The deuterogenous different compact effects can make the lenticle become such with a raised top and a concave bottom which is just like an eyeball. On seismic records, the body of channel sand sedimentary deep-buried and small-sized usually presents with strong amplitudes, but its identification is very hard because of the not high enough resolution. With the processing specially designed, some of them could be eventually recognized and identified.