Seismic reflection characteristics of fluvial sand and shale interbedded layers

被引：21

作者：

Li Guofa ^{[1
,2
]}

Xiong Jinliang ^{[3
]}

Zhou Hui ^{[1
,2
]}

Zhai Tongli ^{[3
]}

机构：

[1] China Univ Petr, CNPC Key Lab Geophys Explorat, Beijing 102249, Peoples R China

[2] China Univ Petr, State Key Lab Petr Resource & Prospecting, Beijing 102249, Peoples R China

[3] PetroChina, Dagang Oil Field, Tianjin 300280, Peoples R China

来源：

APPLIED GEOPHYSICS | 2008年 / 5卷 / 03期

关键词：

continental sedimentation; channel sand; wave field simulation; wavelet interference; impedance inversion;

D O I：

10.1007/s11770-008-0025-3

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

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.

引用

页码：219 / 229

页数：11

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