摘要
基于楔状砂体模型,重点研究了其反射特征及振幅曲线特征,分析了反射特征与砂体厚度及子波主频的关系。认为反射振幅曲线中存在两个关键点,一个是极大值点,对应的砂体厚度为波长的1/4;另一个是极小值点,对应的砂体厚度为波长的1/2。当砂体厚度大于波长的1/4时,可以用砂体反射的波峰与波谷的时间差确定其厚度,称为时间可分辨区。当砂体厚度大于波长的1/2时,由于顶底反射是分开的,用肉眼可直接解释,但其分辨率较低,需要进行振幅曲线分析,找出曲线的极大值点,使纵向分辨率达到波长的1/4。
Based on wedge-shaped sand model,the characteristics of reflection and its amplitude curve were emphatically studied,the relationship between the characteristics of the reflection,sand thickness and the seismic wavelet frequency were analyzed.It was considered that in the amplitude curve there were two key points,one was a maximum point corresponding to sand thickness of a quarter of wavelength;the other was the minimum point corresponding to sand thickness of a half of wavelength.When the sand thickness is greater than a quarter of wavelength,the time between the sand peaks and the trough reflections are used to determine its thickness,it is called as the distinguishable time zone.When the sand thickness is greater than a half of wavelength,because the reflections on the sand top and bottom is separated,it can be directly interpreted with naked eyes,but its resolution is low,thus it is necessary to analyze the amplitude curve to find out the maximum point to obtain the resolution to a quarter of wavelength.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2010年第5期90-94,123,共6页
Journal of Oil and Gas Technology
基金
国家"973"规划项目(2009CB219404)
关键词
楔状砂体
调谐厚度
振幅曲线
wedge-shaped sandstone
tuning thickness
amplitude-curve
