地震相分析在济阳拗陷孔店组沉积相划分中的应用

摘要

以地震地层学的理论为指导，利用地震反射界面的顶底接触关系、外部形态、内部结构及振幅、频率、连续性等7个参数，对济阳拗陷古近系孔店组层序的3个亚层序的地震相进行了精细划分。根据其内部结构和外部形态，在研究区共识别出前积地震相、发散地震相、平行-亚平行地震相、波形地震相、充填地震相、丘状地震相、透镜地震相、杂乱地震相等8类典型的地震相，并将地震相的平面展布特征与钻井及区域构造背景相结合，经过地震地质综合解释，把地震相转化为沉积相，划分出冲积扇、三角洲、近岸水下扇、扇三角洲、深湖-半深湖、滨浅湖、河流-洪泛平原等沉积相。%Under the guidance of seismic stratigraphy,the seismic facies in the Paleogene Kongdian Formation of the Jiyang depression are identified based on seven parameters including the top and bottom contact relationship,external and internal reflection configuration,amplitude,continuity,and frequency.Especially the external and internal reflection configurations can be adopted to classify the seismic facies of the Jiyang depression into eight typical patterns.They are foreset pattern,divergent pattern,parallel and subparallel pattern,wavy pattern,channel-fill pattern,mound pattern,lens pattern,and hummocky clinoform pattern.According to the distribution and tectonic settings of the seismic facies in the Jiyang depression,the seismic facies are transferred into the sedimentary facies classified into alluvial fan,delta,near-shore subaqueous fan,fan delta,semi-deep-lake to deep-lake, shore-shallow lacustrine and flood plain,respectively.