辽河滩海西部海南—仙鹤地区古地貌特征及其控砂作用
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摘要
基于三维地震和测井资料分析,以层序地层分析和古地貌恢复技术相结合,根据地层剥蚀状况,将层序界面分为洼陷带内的平行不整合面、凹陷边缘超覆带的角度不整合面、旋转断块顶部的角度不整合面和潜山顶部强烈剥蚀不整合面4种类型,针对不同的界面类型采用不同的剥蚀地层恢复方法,重建了辽河滩海海南—仙鹤地区关键构造期古地貌形态。研究发现海南—仙鹤地区发育下切谷、陡坡断裂坡折带、古凸起等多种古地貌单元,古地貌整体呈现沟、梁斜列,下切沟谷和陡坡断裂坡折带发育,物源面积大、物源方向与海南断层斜交等特点。古地貌对物源体系、层序构成和砂体分布具有明显控制作用,具有"大沟对大扇,小沟对小扇"、砂体平面上分布受断层坡折控制、纵向分布受体系域控制等特点。
Based on the analysis of 3D seismic and log data,and associated with the technology of the sequence stratigraphy and paleogeomorphology recovery,the sequence boundaries of Hainan-Xianhe zone of the western beach area of Liaohe depression are divided into four types according to the strata erosion level,including the parallel unconformity in the sag,the angular unconformity in overlap zone of the depression edge,the angular unconformity on the top of rotating fault blocks,and the angular unconformity on the top of the buried hill of the heavily erosion area.Different erosion recovery methods had been chosen for different surface types to reconstruct the key tectonic period paleogeomorphology of the zone,which shows that the area develops the incised valley,the slop break,and paleo-uplift.The paleogeomorphology presents the trough and the bridge arranged in oblique,incised valley and fault break in steep slop well developed,and provenance widely distributed and its direction cross intersected with Hainan fault.The paleogeomorphology plays an obvious role in controlling the provenance distribution,sequence stratigraphy constitution and the sandstone distribution,showing "the great trough developing the great fan,and the small trough to the little fan".The sandstone distribution is controlled by the fault breaks in plane and the system tracts in vertical.
引文
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