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《Oil Geophysical Prospecting》 2004-02
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Impact of gypsum layer on seismic reflection feature of subsalt layer in Tahe area.

Wang Shi-min,Qi Li-xin,Hu Peng-fei and Gu Han-ming.Wang Shi-min,Department of Geophysical Exploration,China University of Geo-Science,Wuhan City,Hubei Province,430074,Chnia  
Taking the real model of gypsum layer obtained from the interpretation of seismic section crossing Xiang 1 well in Tahe area as a seismic-geologic model of salt body and using ray-tracing forward modeling and the relation of energy distribution of seismic wave in elastic interface,the paper analyzed the kinematical and dynamic feature of seismic wave in subsalt reflector and its impact on imaging precision of subsalt layer.The analytic results showed that the reflected folds and reflected energy do not abruptly change when seismic wave traveled through the gypsum layer and its margins of Tahe area;the produced upward time shift is less than 4.2 ms when the thickness of gypsum layer is less than 200m.In view of this,the impact of salt body on imaging precision of subsalt layer is minimum in Tahe area,in other words,the subsalt seismic structural image has high confidence level in Tahe area.The studied results in this paper are of benefit to study the subsalt AVO feature and seismic imaging of complicated salt bodies in Tahe area.
【CateGory Index】: P631.4
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