利用相干数据体检测断层与特殊岩性体

利用三维地震资料解决复杂的地质问题具有明显的优越性 ,因为三维地震数据体包含丰富的地层、岩性等信息。然而采用常规三维地震资料的解释方法 ,工作量很大 ,而且很难得到断层和特殊岩性体清晰而准确的直观图像。利用相干数据体检测方法可以解决这一问题。相干数据体是通过对道间相似性等属性的计算 ,实现三维振幅数据体向三维相似系数等属性体的转换。利用相干属性体可对断层做自动、半自动解释 ,也可以实现特殊岩性体的准确成像 ;既可以降低劳动强度 ,又可以缩短三维地震资料的解释周期。文中详细描述了相干数据体算法以及断层和特殊岩性体的自动检测方法 ,实际资料处理展示了相干属性体的良好应用前景

AUTOMATIC DETECTION OF FAULTS AND SPECIAL LITHOLOGIC BODY BY USING COHERENCE ALGORITHM

Three dimensional seismic data are effective for solving geologic problem because the data imply the response of formation and lithology information underground. However, the traditional interpretation method takes more time and is difficult to obtain a clear and exact view of faults and special lithologic body hidden in the 3D seismic data. The coherence algorithm can be used to realize the conversion from 3D amplitude data to semblance or coherence attribute data by calculating coherence between seismic traces. Faults can be picked automatically by the special lithologic body which is easy imaged in the coherence cube. The coherence technique (CTC) not only relax interpreter but also reduce 3D interpretation period. The algorithm of CTC and the automatic detection method for faults and special lithologic body are described in detail. The processing results of seismic data show a good prospect of application of the coherence.