Diving Wave Tomography and Reflection Tomography for PSDM Velocity Model Building of Complex Depth Imaging in Loess Tableland Area of Western Edge of Ordos Basin
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摘要: 针对鄂尔多斯盆地西缘黄土塬区复杂地表和复杂地下构造导致难以准确成像问题，采用浅层潜水波层析反演（DWT）速度建模技术，同时辅以中深层反射波层析成像技术，形成一套实用叠前深度偏移速度建模方法。首先生成一个基于钻井和解释信息的起始近地表速度，其次利用潜水波层析反演建立初始近地表模型，将其与常规处理获得的中深层速度模型进行匹配拼接，建立起初始的起伏地表全速度模型，然后在此基础上利用基于反射波的网格层析进行中深层速度建模，经过多轮次迭代，最终获得可靠的高精度速度模型。鄂尔多斯盆地西缘MJT工区地震资料的成像处理验证了这一套速度建模技术的有效性，地下构造成像更合理也更精确。Abstract: To solve the problem of complex structures under complicated surface conditions in the loess plateau of the western edge of Ordos Basin, a practical prestack depth migration velocity modeling method was developed by using shallow layer diving wave tomography (DWT) and deep layer reflecting wave tomography. First generate a starting near-surface velocity based on drilling and interpret information, secondly diving wave tomographic inversion is used to establish initial near-surface model, with the regular treatment of deep velocity model matching, set up the initial irregular surface velocity model, and then on the basis of grid reflection wave tomography, after iterative rounds, finally obtained the reliable and high precision velocity model. The imaging processing of seismic data in the MJT work area on the western margin of Ordos Basin has verified the effectiveness of this set of velocity modeling technology, and the imaging of underground structure is more reasonable and accurate.
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Keywords:
- loess tableland /
- diving wave tomography /
- reflecting wave tomography /
- PSDM
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