南堡1号构造火成岩发育区稳健保幅处理技术

Robust amplitude-preserving processing strategy for well-developed igneous rocks in the structure Nanpu 1

南堡1号构造位于南堡凹陷西南斜坡,地震资料受馆陶组与东营组火成岩影响,中深层地震能量弱,多次波发育,信噪比低。针对火成岩发育区地震资料特点与地质需求,采用一套稳健保幅的处理技术,逐步提高地震资料品质:一是通过近地表Q补偿技术有效改善因近地表吸收导致的振幅、频率损失及相位畸变;二是采用交叉鬼波化双检合并技术有效压制鬼波,提高了一次波的能量;三是采用稳健地表一致性反褶积技术提高低信噪比资料的分辨率;四是采用高精度Radon变换压制了火成岩引起的多次波。实际资料处理效果表明,采用稳健保幅处理技术,克服了常规处理技术的不足,获得了较高分辨率和信噪比的成果数据,为南堡1号构造油气勘探奠定了良好的基础。

The Structure Nanpu 1 is located in the southwest slope of Nanpu Sag, and it is a buried-hill drape-anticline structure, which is an important oil and gas distribution zone in Jidong Oilfield. Due to two sets of igneous rocks developed in middle and deep layers, seismic data is characterized by low energy,low signal-to-noise ratio(SNR), and strong multiples. So robust amplitude-preserving processing strategies are used to improve seismic data quality. First, near-surface Q compensation is used to compensate amplitude and frequency loss caused by near-surface absorption. Then OBC dual-sensor seismic data merging is used to remove ghost waves. After that, low SNR data is processed by the surface-consistent robust deconvolution. Finally, high resolution Radon transform is used to suppress multiples caused by two sets of igneous rocks. The disadvantage of conventional processing is overcome by the proposed strategies and seismic image quality is greatly improved. Higher resolution and high SNR data provides a good basis for the oil and gas exploration in the Structure Nanpu 1.