苏丹Muglad盆地Fula凹陷福西陡坡带变换构造特征及控藏作用  

Characteristics of transfer structure and hydrocarbon accumulation control of Fula western steep slope belt in the Fula sag,Muglad Basin,Sudan

作　　者：黄彤飞 张荻萩 李曰俊[3] 刘爱香[1] 程顶胜[1] 客伟利[1] 罗贝维[1] 王彦奇 刘红 Huang Tongfei;Zhang Diqiu;Li Yuejun;Liu Aixiang;Cheng Dingsheng;Ke Weili;Luo Beiwei;Wang Yanqi;Liu Hong(PetroChina Research Institute of Petroleum Exploration&Development;CNPC Economics&Technology Research Institute;Institute of Geology and Geophysics,Chinese Academy of Sciences)

机构地区：[1]中国石油勘探开发研究院,100083 [2]中国石油集团经济技术研究院 [3]中国科学院地质与地球物理研究所

出　　处：《中国石油勘探》2020年第4期105-114,共10页China Petroleum Exploration

基　　金：国家科技重大专项“海外重点探区目标评价与未来领域选区选带研究”(2016ZX05029-005);中国石油天然气集团有限公司科学研究与技术开发项目“南苏丹—苏丹重点盆地勘探领域评价与目标优选”(2019D-4306)。

摘　　要：研究断陷盆地陡坡带变换构造特征及其对砂体的控制作用对陡坡带岩性油气藏勘探具有重要意义。基于苏丹Muglad盆地Fula凹陷西部边界断层(福西断层)生长过程的恢复结果,对该凹陷福西陡坡带变换构造的发育位置、类型及特征进行分析,研究了变换构造对陡坡带断陷期有利砂体的控制作用,并预测了该凹陷福西陡坡带岩性油气藏的有利发育区及成藏模式。研究结果表明:福西断层自北向南发育4处同向型变换构造,对陡坡带Abu Gabra组断陷期砂体发育具有明显的控制作用,其控砂模式可分为转换斜坡控砂模式与传递断层控砂模式。福西陡坡带发育的3个岩性油气藏有利区,紧邻生排烃中心,均位于变换构造对应的断层上盘、横向背斜的上倾方向,处于油气二次运移的优势方向。在横向背斜的不同构造位置,不同类型油气藏有序分布,其顶部可形成断背斜油气藏,其两翼易于形成砂岩上倾尖灭油气藏,其底部易于形成滑塌浊积岩透镜体油气藏。It is of great signifi cance for lithologic reservoir exploration in steep slope zone to study the characteristics of transfer structure in the steep slope zone of faulted basin and its control on sand bodies.Based on the recovery results of the growth process of the western boundary fault in the Fula sag(Fula-western fault),Muglad Basin,Sudan,this paper analyzes the development position,type and characteristics of the transfer structure of the Fula western steep slope zone of the sag,studies the control effect of the transfer structure on the favorable sand bodies in the syn-rifting period of the steep slope zone,and predicts the favorable development areas and accumulation model of lithologic oil and gas reservoirs in the Fula western steep slope zone of the sag.The research results show that:there are four synthetic transfer structures in the Fula-western fault from north to south,which have obvious control on the development of sand bodies in the Abu Gabra Formation in steep slope zone during the syn-rifting period.The sand-body controlling modes can be divided into the transfer slope type and the transfer fault type.There are three favorable zones of lithologic oil and gas reservoirs developed in the Fula western steep slope belt.They are close to the hydrocarbon generation and expulsion centers,and are located in the hanging wall of the faults and the up-dip direction of the transverse anticlines related to the transfer structures,which are on the favorable path ways of the secondary hydrocarbon migration.In different structure positions of the transverse anticlines,different types of oil and gas reservoirs are orderly distributed.Faulted anticline reservoirs can be formed at the top of the transverse anticlines.The up-dip pinch-out sandstone reservoirs can be formed at both fl anks.And the fl uxoturbidite-lens reservoirs can be easily formed at the bottom of these anticlines.

关 键 词：断层分段生长 变换构造 陡坡带 岩性油气藏 

分 类 号：TE122.2[石油与天然气工程—油气勘探]