被动大陆边缘盆地浊积水道沉积特征及模式——以西非地区某油田为例  

Sedimentary Characteristics and model of Turbidity channel in passive continental margin Basin——A case study of X Oilfield in the West African Region

作　　者：李燕 王星[1] 鲍志东 赵艳军[2] 齐宇[1] 

机构地区：[1]中海油研究总院,北京100027 [2]中国石油大学地球科学学院,北京102249

出　　处：《内蒙古石油化工》2012年第9期109-113,共5页Inner Mongolia Petrochemical Industry

基　　金：西非及亚太大陆边缘盆地油气田勘探开发一体化技术;国家科技重大专项(2008ZX05030-005-01)

摘　　要：尼日尔三角洲盆地是早白垩世开始发育的被动大陆边缘盆地,三角洲前积推进过程中,受区内陡缓相间的阶梯状地形影响,自北向南形成的拉长状深水海底扇沉积。在钻井岩心描述及相关测试分析的基础上,结合录井、测井等资料分析,对海底扇沉积特征及沉积模式进行了系统研究。研究区以储集层段下部的舌状席状砂(朵叶)和储集层段上部河道沉积为主。岩心分析可识别水道底部滞留沉积、碎屑流沉积、泥质天然堤沉积、砂质天然堤沉积、递变层理的浊积水道沉积、块状朵叶体砂岩和混合砂/页岩段7种岩相,建立本区的沉积模式,对于储层研究更加准确、高效。The Niger Delta Basin is the development of the Early Cretaceous passive continental margin basins,in the advancing process of delta foreset,affected by the ladder-like terrain of steep relief in the region,formed elongated deep-water submarine fan deposition from north to south.On the basis of the analysis in the drilling core description and related test,combined with logging,well logging and other data analysis,a systematic study has been made on sedimentary characteristics and mode of submarine fan.In the work area,the lower of reservoir is mainly the tongue sheet sands(lobes),and the upper of reservoir is mainly channel deposits.Core analysis can identify into seven kinds lithology of retention sedimentary at the bottom of channel,debris flow deposit,argillaceous natural embankment deposition,sandy natural embankment deposition,graded bedding of the turbidity channel deposition,massive leafy sandbody and mixed sand/shale.To establish the mode of deposition of the district allows the reservoir to study more accurately and efficiently.

关 键 词：海底扇 沉积模式 浊积水道 

分 类 号：P618[天文地球—矿床学]