Fula凹陷中央转换带对岩性油藏勘探的意义——以Abu Gabra组为例  

Significance of central transfer zone on lithologic reservoir exploration:a case of Abu Gabra Formation in Fula Sag,Muglad Basin,Sudan

作　　者：吴冬[1,2] 朱筱敏[2,3] 刘常妮 南征兵[4] 史艳丽[4] 

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [2]中国石油大学(北京)地球科学学院,北京102249 [3]中国石油大学(北京)油气资源与探测国家重点实验室,北京102249 [4]中国石油勘探开发研究院非洲研究所,北京100083

出　　处：《岩性油气藏》2017年第4期64-72,共9页Lithologic Reservoirs

基　　金：国家油气重大专项课题"岩性地层油气藏沉积体系;储层形成机理与分布研究"(编号:2011ZX05001-002-005)资助

摘　　要：为了阐明Muglad盆地Fula凹陷Abu Gabra组沉积砂体的分布特征,明确Fula凹陷中央转换带对岩性油藏勘探的意义,利用地震、测井、录井等资料识别典型地震层序和单井层序边界,将Fula凹陷Abu Gabra组划分为5个三级层序,自下而上命名为SQa1~SQa5。在层序格架建立的基础上分析地层厚度分布特征,认为Fula凹陷Abu Gabra组西南厚、东北薄,这种格局的形成与位于Fula凹陷中部的中央构造转换带关系密切;中央构造转换带影响了Abu Gabra组沉积时期的盆地结构、古地貌、沉积相带和层序内部充填,进而影响了Fula凹陷岩性-地层油气藏勘探目标的优选。研究表明,中央转换带北段西侧扇三角洲和浊积体,以及东侧三角洲、南段东侧辫状河三角洲及其前端浊积体、滨浅湖滩坝可作为油气勘探优选目标。In order to demonstrate the distribution of sedimentary sandbodies and effectively guide the explora- tion and development of lithologic and stratigraphic reservoirs ofAbu Gabra Formation in Fula Sag,Muglad Basin, Sudan, under the guidance of the theories and methods of sequence stratigraphy and sedimentology, based on the analysis of seismic and well data, typical seismic sequence boundary and well logging sequence boundary were identified. The formation can be further subdivided into five third-order sequences, which are named as SQa1-SQaS. Based on the sequence framework, the characteristics of formation thickness distribution were analyzed. It is considered that the Abu Gabra Formation is thick in the southwest and thin in the northeast of Fula Sag, which is closely related to the influence of the central transfer zone. The center transfer zone, formed and developed during the sedimentation of SQal-SQaS, is located in the center of Fula Sag, and it also affects the basin architecture, paleogeomorphology, sedimentary facies zone, sequence filling, and distribution of lithologic and stratigraphic traps. It is revealed that fan delta and turbidite in the west and the normal delta in the east of northern central transfer zone, and braided delta, turbidite and beach bar around the east of southern central transfer zone, are potential exploration targets.

关 键 词：层序地层 构造转换带 勘探目标 Abu Gabra组 Muglad盆地 苏丹 

分 类 号：TE122.2[石油与天然气工程—油气勘探]