双参数速度扫描方法研究
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摘要
常规速度扫描在处理长排列地震资料时会出现较大的偏差。根据Alkhalifah提出的垂直横向各向同性介质长排列情况下反射波走时由短排列的正常时差速度vNMO和各向异性参数η确定,并具有非双曲线形式的理论,研究了针对长排列数据的速度分析方法,通过2步扫描方法实现了长排列数据的非双曲线双参数扫描。通过模型试算,证明非双曲线的速度扫描方法能够对长排列和多层介质资料进行精度很高的速度扫描,获得比较准确的叠加速度和层速度数据。
There exists a big error for long spread seismic data process in conventional velocity scanning. Based on the theory proposed by Alkhalifah, that is the reflection wave is determined by normal moveout velocity V_ NMO of short-spread and anisotropic parameter η under the condition of long-spread data of vertical and lateral isotropic media and non-hyperbolic curve, a method for long-spread data velocity analysis is studied. A 2 step scanning method is used for the hyperbolic and dual parameter scanning of long-spread data. It is demonstrated by model operation that the non-hyperbolic velocity scanning can be used for a high precision scanning for long-spread and multi-medium data, by which data of more accurate stacking velocity and interval velocity are obtained.
引文
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