陆相坳陷型盆地地震沉积学研究规范

总结近年来中国陆相地震沉积学研究经验,结合松辽盆地齐家地区研究实例,探讨陆相坳陷型盆地地震沉积学研究规范。地震沉积学所用基础资料包括三维叠后数据体、周边二维区域地震测线和地质背景资料以及工区钻井、测井资料。工作流程强调地震、地质资料综合解释以及地震沉积学分析、层序地层学分析和地震地层学分析的相互配合。工作流程包括井震对比建立层序地层格架、子波相位调整、追踪等时标志层、地震分辨率分析、岩石物理关系分析、地震参数筛选、地层切片处理、地震沉积相分析以及综合评价等基本步骤。要求的成果图件则包括联井基干地震剖面、层拉平相对地质时间剖面、地层切片、沉积相图等十余种。这些步骤在松辽盆地齐家地区白垩系青山口组的实例研究中得到了充分体现,其研究思路、分析资料和成果图件可作为在其他陆相盆地,尤其是坳陷型盆地进行地震沉积学研究的参照。

Guidelines for seismic sedimentologic study in non-marine postrift basins

This study summarizes the research experiences of non-marine seismic sedimentology in recent years in China and uses Qijia area,Songliao Basin,as a template to establish general guidelines for seismic sedimentology.Basic data sets include stacked 3D seismic volumes,2D regional seismic lines,data for regional geologic settings,and well data.The workflow emphasizes the integration of seismic and geologic interpretations and balanced use of seismic sedimentology,sequence stratigraphy and seismic stratigraphy.Basic steps include well-to-seismic tie for the establishment of sequence framework,wavelet-phase adjustment,picking of geologic-time parallel seismic events,seismic resolution analysis,petrophysical analysis,selection of seismic attributes,stratal slicing,seismic depositional facies analysis,and applications to exploration and development.Expected maps range from key interpreted well-seismic sections,flattened relative geologic-time sections,stratal slices,and depositional facies maps,etc.The workflow is applied in the study of the Cretaceous Qingshankou Formation in the Qijia area,Songliao Basin,which can be used as a reference for seismic sedimentologic study in non-marine basins,especially in postrift depression-type basins in China.