苏丹Muglad盆地Fula凹陷福西陡坡带变换构造特征及控藏作用

doi:10.3969/j.issn.1672-7703.2020.04.011

摘要/Abstract

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。

关键词: 断层分段生长, 变换构造, 陡坡带, 岩性油气藏

Abstract: Study of the characteristics of transfer structures and their control of sand bodies is of great significance for lithologic reservoir exploration in steep slope zones of rift basins. This paper analyzes the development position, type, and characteristics of the transfer structures in the western steep slope zone of the Fula sag in the Muglad Basin, Sudan, and their control effect on sand bodies during the rifting period of the steep slope zone. Favorable areas for development are identified and the accumulation model of lithologic oil and gas reservoirs in the western steep slope zone of the Fula sag is described. Analysis is based on restoration of the growth process of the western boundary fault in the sag (the Fula-western fault). Results show that there are four synthetic transfer structures in the Fula-western fault from north to south, which controlled the development of sand bodies in the Abu Gabra Formation in the steep slope zone during the rifting period. The controlling modes of sand body development can be divided into two types: transfer slope mode and transfer fault mode. Three favorable zones for lithologic oil and gas reservoirs are developed in the western steep slope zone of the Fula sag. They are located close to hydrocarbon generation and expulsion centers, in the hanging walls of faults and on the up-dip direction of transverse anticlines related to the transfer structures, which are on favorable pathways for secondary hydrocarbon migration. Different types of oil and gas reservoirs are regularly distributed in different structural positions on the transverse anticlines. Faulted anticline reservoirs can form at the tops of transverse anticlines. In these anticlines, up-dip pinch-out sandstone reservoirs can form in both flanks and fluxoturbidite-lens reservoirs form easily at the bottoms.

中图分类号:

黄彤飞, 张荻萩, 李曰俊, 刘爱香, 程顶胜, 客伟利, 罗贝维, 王彦奇, 刘红. 苏丹Muglad盆地Fula凹陷福西陡坡带变换构造特征及控藏作用[J]. 中国石油勘探, 2020, 25(4): 105-114.

Huang Tongfei, Zhang Diqiu, Li Yuejun, Liu Aixiang, Cheng Dingsheng, Ke Weili, Luo Beiwei, Wang Yanqi, Liu Hong. Characteristics of transfer structures and hydrocarbon accumulation control in the western steep slope zone of the Fula sag, Muglad Basin, Sudan[J]. China Petroleum Exploration, 2020, 25(4): 105-114.

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