Imaging complex structure in shallow seismic-reflection data using prestack depth migration
Imaging complex structure in shallow seismic-reflection data using prestack depth migration
复制标题
利用叠前深度偏移对浅层地震反射数据中的复杂结构进行成像
作者：
J. Bradford;L. Liberty;M. Lyle;W. P. Clement;S. Hess
叠前深度偏移偏移分析有可能显著提高俄勒冈州浅层seismicreflectionimagesandthemeasuredvelocitydistributions.InastudydesignedtoimagefaultsintheAlvordBasin，的精度，在25-1000m深度范围内，叠前深度偏移偏移分析在整个目标深度范围内产生了详细的反射图像。相比之下，叠后时间偏移在100m以上产生了明显的偏移伪影，遮挡了反射事件，限制了浅部的构造解释。此外，PSDM速度模型从2500m/S突然增加到3000m/S，限制了从沉积盆地充填到basementvolcanicrocks.PSDManalysisrevealedacomplex伸展历史的解释，盆地growthandamidbasinbasementhighthatformsthedivision至少有两个截然不同的阶段。
Prestack depth migration PSDM analysis has the potential to significantly improve the accuracy of both shallow seismicreflectionimagesandthemeasuredvelocitydistributions.InastudydesignedtoimagefaultsintheAlvordBasin, Oregon, at depths from 25‐1000 m, PSDM produced a detailed reflection image over the full target depth range. In contrast, poststack time migration produced significant migration artifacts in the upper 100 m that obscured reflection events and limited the structural interpretation in the shallow section. Additionally, an abrupt increase from 2500 to 3000 m/s in the PSDM velocity model constrained the interpretation of the transition from sedimentary basin fill to basementvolcanicrocks.PSDManalysisrevealedacomplex extensional history with at least two distinct phases of basin growthandamidbasinbasementhighthatformsthedivision betweentwomajorbasincompartments.