复杂断块断裂精细刻画新技术及其应用

A new technique to delicately depict faults in complex faulted blocks and its application

通过对复杂断块断裂地震反射特征的研究和微弱信号增强技术的引入,提出了一种增强断裂固有频率信号成分特征的复杂断块断裂精细刻画新技术。首先在确定断裂最佳成像频带基础上进行分频的实现,再进行断裂连续性的增强,最后利用3个不同优势频带断裂信息融合图和优势频带相位切片进行断裂的精细刻画。海外A区块实际应用效果表明,利用本文提出的新技术可使该区块内断层及异常体边界划定更为精确,能够有效区分出断层和沉积河道,有效区块共精细落实了6个新目标,所钻探的3口井均已获得优质天然气,证实了这一新技术在落实钻探目标方面的有效性。

By researching seismic reflections of faults in complex faulted blocks and introducing a tool to enhance weak signals, a new technique to delicately depict faults in complex faulted blocks was developed, which can enhance the natural fre quency signals of faults. Firstly, the frequency de composition is realized on a basis of determining the optimal frequency bands of fault imaging, then the fault continuity was enhanced, and finally the blending map of fault information from 3 different dominate frequency bands and the phase slices of dominate frequency bands are used to delicately de pict the faults. The actual application in oversea Block A has indicated that the new technique can more accurately identify faults and boundaries of a nomalous body, and effectively distinguish a fault from a depositional channel. Therefore, 6 new prospects were identified in Block A, and high quality gas zones were penetrated in all 3 drilled wells, proving the effectiveness of this new tech- nique in identifying drilling prospects.