渤海西岸、南岸从全新世海侵边界至现在海岸线之间的海岸低地是7000 a B.P.以来多个三角洲进积的结果。由于黄河入海泥沙数量巨大,导致下游河道频繁摆动,活动三角洲(超级叶瓣)位置多次变迁。滦河三角洲活动叶瓣位置也多次变迁。海岸线...渤海西岸、南岸从全新世海侵边界至现在海岸线之间的海岸低地是7000 a B.P.以来多个三角洲进积的结果。由于黄河入海泥沙数量巨大,导致下游河道频繁摆动,活动三角洲(超级叶瓣)位置多次变迁。滦河三角洲活动叶瓣位置也多次变迁。海岸线变迁受三角洲演化控制:活动期推进、废弃初期后退和之后的长期稳定,表现分片突进模式。整体来说研究区各时期海岸线表现出局部突出、局部内凹特点。在这样的三角洲群地区不可能出现近乎匀速的平推式海岸变迁。展开更多
Imaging the PP- and PS-wave for the elastic vector wave reverse-time migration requires separating the P- and S-waves during the wave field extrapolation. The amplitude and phase of the P- and S-waves are distorted wh...Imaging the PP- and PS-wave for the elastic vector wave reverse-time migration requires separating the P- and S-waves during the wave field extrapolation. The amplitude and phase of the P- and S-waves are distorted when divergence and curl operators are used to separate the P- and S-waves. We present a P- and S-wave amplitude-preserving separation algorithm for the elastic wavefield extrapolation. First, we add the P-wave pressure and P-wave vibration velocity equation to the conventional elastic wave equation to decompose the P- and S-wave vectors. Then, we synthesize the scalar P- and S-wave from the vector P- and S-wave to obtain the scalar P- and S-wave. The amplitude-preserved separated P- and S-waves are imaged based on the vector wave reverse-time migration （RTM）. This method ensures that the amplitude and phase of the separated P- and S-wave remain unchanged compared with the divergence and curl operators. In addition, after decomposition, the P-wave pressure and vibration velocity can be used to suppress the interlayer reflection noise and to correct the S-wave polarity. This improves the image quality of P- and S-wave in multicomponent seismic data and the true-amplitude elastic reverse time migration used in prestack inversion.展开更多
文摘渤海西岸、南岸从全新世海侵边界至现在海岸线之间的海岸低地是7000 a B.P.以来多个三角洲进积的结果。由于黄河入海泥沙数量巨大,导致下游河道频繁摆动,活动三角洲(超级叶瓣)位置多次变迁。滦河三角洲活动叶瓣位置也多次变迁。海岸线变迁受三角洲演化控制:活动期推进、废弃初期后退和之后的长期稳定,表现分片突进模式。整体来说研究区各时期海岸线表现出局部突出、局部内凹特点。在这样的三角洲群地区不可能出现近乎匀速的平推式海岸变迁。
基金supported by Special Research Grant for Non-profit Public Service(No.201511037)National Natural Science Foundation of China(No.41504109,41506084,and 41406071)+1 种基金China Postdoctoral Science Foundation(No.2015M582060)Qingdao Municipal Applied Research Projects(No.2015308)
文摘Imaging the PP- and PS-wave for the elastic vector wave reverse-time migration requires separating the P- and S-waves during the wave field extrapolation. The amplitude and phase of the P- and S-waves are distorted when divergence and curl operators are used to separate the P- and S-waves. We present a P- and S-wave amplitude-preserving separation algorithm for the elastic wavefield extrapolation. First, we add the P-wave pressure and P-wave vibration velocity equation to the conventional elastic wave equation to decompose the P- and S-wave vectors. Then, we synthesize the scalar P- and S-wave from the vector P- and S-wave to obtain the scalar P- and S-wave. The amplitude-preserved separated P- and S-waves are imaged based on the vector wave reverse-time migration （RTM）. This method ensures that the amplitude and phase of the separated P- and S-wave remain unchanged compared with the divergence and curl operators. In addition, after decomposition, the P-wave pressure and vibration velocity can be used to suppress the interlayer reflection noise and to correct the S-wave polarity. This improves the image quality of P- and S-wave in multicomponent seismic data and the true-amplitude elastic reverse time migration used in prestack inversion.
