摘要
库弗腊盆地是在稳定结晶基底上形成的大型古生代克拉通内坳陷盆地。油气地质评价认为,该盆地发育始寒武系—白垩系的浅海相与河流相交互沉积,依据钻井、露头、孢粉组合可将其沉积序列划分为8套地层单元。推测盆地存在3套烃源岩:始寒武系泥岩、奥陶系泥岩、志留系Tanezzuft组泥岩,其中Tanezzuft组泥岩是盆地最有可能的烃源岩。库弗腊盆地可能存在奥陶系—志留系和始寒武系两套成藏组合,盆地模拟结果表明盆地的两个沉积中心(Uri槽和Kalanshiyu槽)的烃源岩已达到生油窗范围,是否存在有效烃源岩是决定该盆地油气潜力的主要因素和油气勘探的最大地质风险所在。
Kufra Basin is a large Palaeozoic intracratonic sag basin, which is formed on the crystallization basement. The hydrocarbon geologic evaluation reveals that the basin fill consists of shallow marine to continental fluvial deposits ranging in age from Infracambrian to Cretaceous. Eight sections of reservoir are classified based on drilling data, outcrops and palynologyic association. Three sets of source rocks are predicted to exist in the basin, namely, Infracambrian black shale or limestone, Ordovician shale and Lower Silurian shale （Tanezzuft Formation）. The Lower Silurian shale is the most possible source rock. Two potential plays of Ordovician Silurian and Infracambrian are predicted to exist in the basin. Basin modeling shows that the potential source rocks of the two depo-centers （Uri and Kalanshiyu Troughs） reached the oilgenerating window. Whether effective source rocks exist or not is the main element of determining the hydrocarbon potential and the riskiest geologic element for hydrocarbon exploration.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2007年第2期252-256,共5页
Petroleum Exploration and Development
基金
中国石油天然气集团公司2004年研究课题"海外油气田勘探与开发技术研究"(04B60204)
关键词
北非
库弗腊盆地
克拉通
烃源岩
油气成藏条件
North Africa
Kufra Basin
craton
source rock
hydrocarbon accumulation condition
