三维地震相干体技术在目标区沉积相研究中的应用

Using coherency cube technique to classify sedimentary fa- cies in the object area.

用于检测地震波同相轴不连续性的相干体技术可以用来识别断层、特殊岩性体、河道等,它提供了丰富的构造和岩性方面的信息,是三维地震资料地质解释的一个有效工具。在相干体切片上除了能够识别出地质上的不连续特征外,还可以根据相干性的级别进行目标区的沉积相研究。根据相干体切片上给出的构造框架和岩性信息,可以进行沉积相划分,弄清沉积相平面分布情况,分析和探讨研究区的物源方向。为了使相干体数据提供岩性解释和沉积特征描述方面的信息,需要对地震数据进行预处理。采用保持边缘滤波技术和高分辨率处理技术,使相干体成像细致,级别信息丰富,反映的岩性和沉积的层次细节清楚。

The discontinuity of seismic wave events can be detected by coherency cub technique, so it can identify fault, geologic abnormal and channel etc. It can provide abundant geologic structure and lithology information as a powerful tool for 3-D seismic interpretation. The geologic discontinuous character can be recognized in coherence slices. We also can use it to study the sedimentary facies through the coherence levels. Provided the lithology and sedimentary information, seismic data should be preprocessed before coherence calculating. Edge-preserved filter and high-resolution processing are adopted. Thus, coherence data can give clear lithology levels and image the facies characteristically. With the structure and lithology information provided by coherence slices, we can classify the sedimentary facies and distribution; we can also study the resources direction in the object area.