Fula凹陷中央转换带对岩性油藏勘探的意义——以Abu Gabra组为例

发布时间：2019-07-29 11:57

【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。
[Abstract]:In order to clarify the distribution characteristics of sedimentary sand bodies of Abu Gabra formation in Fula sag of Muglad basin, and to clarify the significance of central transition zone in Fula sag for lithologic reservoir exploration, the typical seismic sequence and single well sequence boundary are identified by using seismic, logging and logging data. The Abu Gabra formation in Fula sag is divided into five third-order sequences, named SQa1~SQa5. from bottom to top. Based on the establishment of sequence framework, the distribution characteristics of strata thickness are analyzed, and it is considered that the southwest of Abu Gabra formation in Fula sag is thick and the northeast is thin, and the formation of this pattern is closely related to the central structural transformation zone located in the middle of Fula sag. The central tectonic transformation zone affects the basin structure, paleogeomorphology, sedimentary facies zone and sequence filling in the sedimentary period of Abu Gabra formation, thus affecting the optimization of lithology-formation oil and gas reservoir exploration targets in Fula sag. The results show that the western fan deltas and turbidity bodies in the north section of the central conversion zone, as well as the eastern deltas, the braided river deltas and their front-end turbidity bodies in the eastern section of the southern section, and the shoreline shallow lake beach bar can be used as the optimal targets for oil and gas exploration.
【作者单位】：中国石化胜利油田分公司勘探开发研究院;中国石油大学(北京)地球科学学院;中国石油大学(北京)油气资源与探测国家重点实验室;中国石油勘探开发研究院非洲研究所;
【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
【分类号】：P618.13

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