3DVSP channel gather cutting technique based on tensile ratio and its application
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摘要: 常规处理后的3DVSP共检波点道集在不同偏移距处产生不同拉伸畸变效应,尤其是浅层和大偏移距尤为明显,影响叠加剖面成像质量。为此,分析了拉伸效应原因,推导了拉伸率公式,提出了基于拉伸率的道集切除方法:逐点计算共检波点道集中每一点拉伸率,确定有效拉伸率范围,对拉伸率过大的点进行切除。模型分析和实际资料处理结果显示了方法的正确性和有效性。Abstract: 3DVSP common detection point gathers produce different tensile distortion effects at different offsets after conventional processing,especially at the shallow layer and large offset,which affects the imaging quality of the superimposed section.In view of such a situation,the author analyzed the stretch effect reason,deduced the stretch rate formula,and proposed a trace-set cutting method based on stretch rate:to calculate the stretch rate of each point in the trace set of common detection points point by point,determine the range of effective stretch rate,and cut the points with excessive stretch rate.The results of model analysis and actual data processing show that the method is correct and effective.
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Key words:
- 3DVSP /
- tensile rate /
- gather cutting /
- stacking profile imaging
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