不同尺度裂缝的叠后地震预测技术研究

分析了大尺度、中尺度和小尺度3种不同尺度断裂裂缝的类型、成因和地质特点,总结并提出了这3种不同尺度裂缝的地球物理特征及其综合预测方法。多尺度裂缝地震预测技术主要利用多尺度相干、多尺度曲率以及Likelihood属性。研究认为:利用断面增强、多尺度相干、结构张量等多种属性方法可实现大尺度断裂裂缝的边界刻画和内幕识别;利用多尺度曲率加蚂蚁体的计算方法可获得不同级别的中尺度裂缝发育体的预测结果;利用叠后Likelihood属性可预测小尺度裂缝空间展布。最终形成了一套针对不同级别裂缝的叠后地震预测技术系列,并展示了应用该技术得到的3种不同尺度裂缝地震预测结果。

In this study,the types,genesis and geological characteristics of fault-fractures of three different scales (large,medium,and small) are analyzed,and the geophysical characteristics and comprehensive methods for predicting these fractures are summarized.In addition,the basic principles of seismic prediction techniques for multi-scale fractures are introduced,including the multi-scale coherence,multi-scale curvature,and likelihood properties.A series of poststack seismic prediction techniques for fractures of different scales is presented.First,the boundary characterization and the recognition of insider large-scale faults are achieved,using fault-plane enhancement,multi-scale coherence,structural tensor.Subsequently,the medium-scale fractures are predicted using multi-scale curvature and tracking technique.Finally,the distribution of small-scale cracks is predicted using the likelihood attribute.Practical application verified the effectiveness of these prediction techniques.

国家科技重大专项(2016ZX05014-001,2016ZX05053-017)共同资助。