用宽频带高分辨率地震分析河道砂体层序地层特征  

Sequence stratigraphic characteristics of channel sandbody through broad band high resolution seismic section

作　　者：李子顺[1] 

机构地区：[1]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712

出　　处：《地学前缘》2012年第1期200-208,共9页Earth Science Frontiers

基　　金：教育部长江学者与创新团队发展计划项目(IRT0864)

摘　　要：松辽盆地油气勘探开发的主要目标是大型河流-三角洲沉积的河道砂体,河道砂体单层厚度普遍较小,河道改道频繁,地层对比特征不明显,缺乏明显的对比标志。为用地震资料描述河道砂体,近几年我们研制出宽频带高分辨率地震技术,地震频带宽度达5～360Hz,视主频达150Hz,分辨率大幅提高。怎样以层序地层的观点用宽频带高分辨率地震描述河道砂体是一项迫切的任务。应用正演模型技术,分析了薄层河道砂体的宽频带高分辨率地震特征,认识到河道砂体两侧河床的角度不整合斜反射是识别河道砂体的重要层序地层标志。本文通过井震结合,解释了松辽盆地杏树岗3D地震工区宽频带高分辨率地震剖面,识别出单一河道和复合河道两种河道类型,分析了扶余油层上部宽频带高分辨率地震的层序地层特征,通过x70井扶余油层层序五下凹型河道砂体的剖面和平面特征分析,依据地震地层学的观点,认为该河道砂体具有网状河三角洲分流河道特征。The main oil and gas exploration and development target in the Songliao Basin is the large fluvial channel sandstones or delta distributary channel sandstones.The single-layer thickness of sandstone was small,the rivers diverted frequently,and characteristics of the stratigraphic correlation of channel were not obvious.Using seismic data to describe channel sandbody,recently we have developed a broad band high resolution seismic technology,so seismic predominant frequency bandwidth in Xingshugang of Songliao Basin has increased from 5-80Hz to 5-360Hz,seismic apparent dominant frequency is 150Hz,and seismic resolution increases dramatically.It is an urgent task how to describe the sequence stratigraphy of channel sandbody using broad bandwidth high resolution seismic data.With forward modeling technology,we analyzed the thin layer channel sandbody characteristics on broad-spectral-bandwidth high resolution seismic.We realized that the inclined reflection of angular unconformity in both sides of channel sandbody is the important sequence stratigraphic logo for identifying channel sandbody.Combined with exploration well material,to explain broad bandwidth high resolution seismic profile in Xingshugang of Songliao Basin,we obtain some understanding.We found two sandbody types,i.e.,the single channel sandbody and the composite sandbody.We analyzed the sequence characteristic of Fuyu reservoir on broad bandwidth high resolution seismic section.Through the channel sandbody profile feature analysis of x70well,we know that the channel sandbody characteristics in Fuyu oil layer sequence five is anastomosing river delta.

关 键 词：层序地层 河道砂 角度不整合 高分辨率地震 松辽盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]