优势频带相位分析技术在AA区块断层解释中的应用

AA区块断裂系统复杂,断层延伸短、断距小,存在连续性差、搭接关系不明等问题,应用常规地震解释方法对此类断层进行识别较为困难。针对研究区存在的问题,利用改进的小波变换分频技术研究断层的最佳成像频带(即优势频带);在最佳成像频带内,通过浏览不同频率的相位切片,优选出断层组合关系最清楚、最全面的优势频带相位切片,观察其相位滞后分布特征,较好地实现了断层精细解释和断裂系统识别。实际应用结果表明,优势频带相位分析技术能识别更多的地层不连续性信息,弥补传统相干等方法的不足,对断层搭接关系的识别和异常边界的划定更为准确。

Application of dominant frequency band phase analysis technique on the fault interpretation in AA Block

The complex faulted system in AA Block is characterized by short extended distance and small fault throw,and the faults has bad continuity and uncertain contact relationship,which leads to the difficulty in the fault identification by conventional seismic interpretation.Aiming at the problem,we adopted the improved wavelet transform frequency division technique to study the optimum imaging frequency band (that is the dominant frequency band).In the optimum imaging frequency band,by browsing the phase slices with different frequency,the slices with clearest and most comprehensive fault combination relationship were optimized.Then,by observing its phase delaying characteristic,fine fault interpretation and faulted system identification were well done.Actual application shows that dominant frequency band phase analysis technique can recognize more discontinuous information of formations,which compensates the deficiency of traditional coherent method and is more accurate for the delimitation of fault boundary.