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滨里海盆地某区块构造复杂,速度变化剧烈。针对盐下异常体的识别这一难点,应用叠前深度偏移技术进行资料处理。资料处理以“三高”处理为基础、以层状建模为约束,结合高密度层析成像迭代技术建立精细的速度模型。通过精细的预处理,用地层约束的层析速度反演方法得到最终的深度-速度模型,精细处理的三维叠前深度偏移结果能够正确地反映地下地质情况,能更好地识别盐下异常体。
Some block in the Caspian basin is complicated in structure and its speed changes drastically. Aiming at the difficulty of recognizing the abnormal body under the salt, the pre-stack depth migration technique is used to process the data. Data processing is based on “three-high ” processing, layered modeling as a constraint, combined with high-density tomography iterative techniques to establish a sophisticated velocity model. Through careful preprocessing, the final depth-velocity model is derived from the stratigraphic constrained tomographic velocity inversion method. The finely-processed 3D prestack depth migration results can correctly reflect the underground geological conditions and can better identify sub-salt anomalies body.