OVT域宽方位叠前地震属性分析方法

OVT域宽方位叠前地震属性分析是宽方位高密度地震勘探的配套技术.以方位各向异性分析为核心的OVT域叠前地震属性分析,充分利用叠前地震资料蕴含的地质信息和流体信息,可更有效地进行储层预测.本文以OVT域地震解释技术为主线,首先简要介绍OVT技术及其发展历程,探讨OVT技术对常规地震资料解释带来的革新及在OVT域进行地震资料解释的必要性;然后对基于方位角-炮检距叠加模板的OVT道集动态分析与叠加、OVT道集多尺度(多入射角)和多方位分析、OVT域AVO分析和OVT域方位各向异性分析等四种面向OVT域叠前地震属性分析与解释技术进行了详细论述;理论分析及在碳酸盐岩(裂缝)储层预测中的应用实例效果均表明,本文提出/倡导的OVT域叠前地震属性分析技术突破了常规叠后地震资料解释技术的局限性,基于OVT道集可实现高精度各向异性分析,显著提高了地震资料解释和裂缝预测的精度和准确性.

OVT-domain wide-azimuth prestack seismic attribute analysis

OVT-domain wide-azimuth prestack seismic attribute analysis is one of the most important approaches in wide azimuth seismic. Based on azimuthal anisotropy analysis, it can excavate geological and fluid information contained in prestack seismic datasets and effectively carry out reservoir prediction. In this paper we first make a brief introduction to OVT and its development history, and its innovations on seismic interpretation, and then discuss four types of OVT-domain prestack seismic attribute analysis, namely, the template-based dynamic OVT gather analysis and stacking imaging, OVT-domain multi-offset and multi-azimuth analysis, AVO analysis, and azimuthal anisotropy analysis. As an advanced prestack seismic interpretation tool, it provides an effective way for reservoir and fluid prediction on prestack seismic data. Real examples in carbonate fracture prediction show that the proposed approach breaks through the limitations of conventional poststack seismic interpretation, realize the high-precision azimuthal anisotropy analysis based on OVT gathers, and improve the accuracy of seismic structure analysis and reservoir characterization.