【摘要】 为了更好地满足我国海上油田开发中小断层识别、薄储层刻画的需求,综合考虑VSP平面方位角、井眼条件等因素,根据正演模拟和枪阵组合震源优化,面向油田地质目标,提出了Walkaway VSP资料采集方法,针对渤海H油田W1井设计了8方位的Walkaway VSP采集测线;针对常规VSP波场分离方法存在的混波、低频化、波形畸变等缺陷,提出了基于全局参数反演的波场分离技术;针对常规反Q滤波技术仅适用于地面地震数据,提出了基于VSP射线路径的反Q滤波技术;首次将时域任意广角单程波动方程偏移算法推广到Walkaway VSP偏移成像中。这些技术成功应用于渤海H油田Walkaway VSP资料采集和处理中,获得了高分辨率的成果剖面,有利于波组特征识别和断层的精细刻画,满足了油藏精细研究的资料质量要求。更多还原

【Abstract】 To satisfy the requirements of small faults and thin reservoirs description in our offshore oilfield development,considering azimuth,borehole conditions and geological targets,eight Walkaway VSP lines aimed at W1 well of H oilfield in Bohai Bay are proposed based on forward modeling and source optimization of gun arrays. To avoid mixed wave,low frequency and waveform distortion existing in conventional methods,a new VSP wave-field separation method is proposed based on global parameter inversion. The conventional inverse Q filtering is only applicable to surface seismic data,so a new inverse Q filtering method is realized based on VSP ray path. Arbitrary wide-angle one-way wave equation migration is extended to Walkaway VSP data for the first time. The techniques have been successfully applied to Walkaway VSP data acquisition and processing in H oilfield,and the resulting high resolution sections are beneficial for wave group features recognition and detailed faults characterization.更多还原