沾化凹陷东部长堤地区下第三系沉积体系研究  

Study on the Sedimentary System of Paleogene in Changdi Region of Zhanhua Sag

作　　者：国景星[1] 戴启德[2] 徐炜[2] 

机构地区：[1]中国矿业大学,江苏徐州221008 [2]石油大学石油资源科学系,山东东营257061

出　　处：《沉积学报》2001年第3期368-374,共7页Acta Sedimentologica Sinica

摘　　要：综合运用地质、测井、地震及分析化验等资料 ,对沾化凹陷东部长堤地区下第三系沉积体系进行了较为全面系统的研究 ,认为长堤地区下第三系发育有水下扇、滨浅湖滩坝、扇三角洲、浊积和辫状河等 5类沉积体系。并阐述了各类沉积体系在本区的亚相、微相类型及其特征 ,系统分析了早第三纪不同阶段的沉积相类型及其分布特征 ,探讨了不同时期物源区及古水流流向 。Changdi region is situated in the eastern part of Zhanhua sag in Jiyang depression. It belongs to one part of the Zhuangxi Gudong buried hill belt in structure,with area an about 160 km 2. Based on the synthetical analysis the geological, log, seismic and chemical analysis data,the authors believe 5 types of sedimentary system were developed in this area in Paleogene,that is, subsurface fan, beach and dam, fan delta, turbidity current and braided river. Subsurface fan can be divided 3 types of sub facieses,i.e, root fan, middle fan and fan edge by core and conglomerate distribution and etc. The middle fan can be divided 3 micro facies-braided channel, space between channel and front edge zone. In the braided channel, sediment grain is coatse. And it shows positive rhythm, SP curve with box type and etc. Surface of scour can be seen at the bottom of the channel. Beach and bar system were formed at the edge of lake, shallow platform and etc. They can be divided into 2 types,i.e.,terrigenous debris type and carbonate rock type. The terrigenous debris type was distributed mainly over the west edge of the study area, and carbonate rock type was distributed mainly in the middle part. About the fan delta system, there were prodelta and delta front in the area. The delta front subfaces consists of embranchment channel, channel mouth bar and etc.Judged by distribution of the sedimentary system, during the third member of Shahejie formation, researching area belongs to subsurface fan system. From the early stage to metaphase, the sediment range were widened gradually. In the later period, the range of lake and size of subsurface fan diminished. During the second member and the early stage of the first member of the Shahejie Formation, this area belonged to beach and bar system. In the third member of Dongying Formation, the study area belonged to fan delta system, and it stretched gradually from southeast to north.During the later period, the southeast part developed the fan delta plain.The delta front subface

关 键 词：沾化凹陷 长堤地区 下第三系 沉积体系 沉积亚相 沉积微相 

分 类 号：P588.2[天文地球—岩石学] P534.61[天文地球—地质学]