冀中古盆沙二期、沙三期沉积充填特征探讨  

AN INVESTIGATION INTO THE CHARACTERISTICS OF THE SEDIMENTARY FILLING IN Es^(2-3), JIZHONG BASIN

作　　者：田崇鲁[1] 李德同[1] 刘铁铨 

机构地区：[1]石油大学研究生部 [2]石油部物探局解释中心

出　　处：《沉积学报》1990年第4期33-40,共8页Acta Sedimentologica Sinica

摘　　要：冀中早第三纪古盆属断陷型拗陷。拗陷内包括14个箕状凹陷和6个凸起。拗陷的东西分带及拗陷演化史决定拗陷内的河湖沉积体系及沉积充填特征。沙二期、三期冀中古盆的沉积特点是河湖体系的东西分区性:西部为正常的平原型河流,河流相序完整;东部为湖区。河湖体系的分布不受局部箕状凹陷所控制。古流除正常河流外,还有短流程山麓型河流,仅分布在湖盆周缘。拗陷演化分为了大周期及6个次级水进、水退周期,控制着湖盆砂体的纵向层位分布。应用地震地层学研究拗陷沉积充填模式可提供丰富地质信息。目前所发现的储层均属湖成砂岩体。冀中古盆有6类湖成砂岩体,其形成受古流类型及地貌特征所决定;其分布则受古流特征及连通水域所控。The ancient basin of Paleogene in Jizhong region is of the faulted depression type. In the depression exist fourteen dustpan-like sags and six uplifts. The regional structural characters of the depression are that depressions' being divided into east and west parts and its evolution history determine the features of the fluvial-lacustrine system and herein the sedimentary tilling. The sedimentary filling in Es2-3 of Jizhong Basin features the fluvial-lacustrine system being divided into two parts: the west part belongs to standard plain type rivers with complete fades sequences; the east is a lake region. The distribution of the system is not mainly controlled by the local dustpan-like sags. In addition to ordinary rivers there are short ancient rivers of mountain-foot type scattering along the periphery of the lake basin. The evolution process of the sags consists of three great cycles and six secondary transgression and regression cycles, which governs the longitudinal distribution of the sand bodies in the lake basin. The application of seismic stratigaphy to the study of sedimentary filling models in the depression offers plenty of geological information. The reservoirs so far discovered in Jizhong Basin all are sand bodies of lake sediment which fall into six types, the formation of which appears to be determined by the ancient river type and topographic features, and the distribution of which seems to be controlled by ancient rivers as well as the communicated waters. Jizhong region can be classified into four groups and six subgroups of sedimentary system tracts, thus characterizing the sedimentary filling in Es2_3 in the region.

关 键 词：断陷 充填模式 古盆 古流 地震相 

分 类 号：P512.2[天文地球—地质学]