Seismic reflection characteristics of fluvial sand and shale interbedded layers

A sedimentary geological model is established in order to study the seismic reflection characteristics of channel sand bodies. Synthetic seismic shot gathers are simulated using the acoustic wave equation and then are prestack time migrated. On the imaged data, the reflection characteristics and ins...

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Bibliographic Details
Published inApplied geophysics Vol. 5; no. 3; pp. 219 - 229
Main Authors Li, Guofa, Xiong, Jinliang, Zhou, Hui, Zhai, Tongli
Format Journal Article
LanguageEnglish
Published Heidelberg Chinese Geophysical Society 01.09.2008
Springer Nature B.V
Subjects
Earth and Environmental Science
Earth Sciences
Geophysics
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Impedance
Sand
Sediments
Seismic activity
Seismology
Studies
channel sand
impedance inversion
Continental sedimentation
wave field simulation]wavelet interference
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Summary:A sedimentary geological model is established in order to study the seismic reflection characteristics of channel sand bodies. Synthetic seismic shot gathers are simulated using the acoustic wave equation and then are prestack time migrated. On the imaged data, the reflection characteristics and instantaneous attributes are analyzed and log-constrained impedance inversion is tested. Because of wave field interference, the experimental results show that seismic events do not definitely correspond to the channel sand bodies and that seismic modes of occurrence do not represent the actual ones. The seismic events formed by wave interference may lead to errors and pitfalls in sand body interpretation. The corresponding relations between instantaneous seismic attributes and sedimentary sands are not well established. Log-constrained impedance inversion improves the resolution of channel sands. However, if the inverted resolution is forced to be too high, artifacts related to the initial model may occur.
ISSN:1672-7975
1993-0658
DOI:10.1007/s11770-008-0025-3