红海盆地Tokar地区构造成因与圈闭样式  

Tectonic origin and structural styles in Tokar area,Red Sea Basin

作　　者：王国林[1] 

机构地区：[1]中国石油大学(北京)资源与信息学院

出　　处：《石油勘探与开发》2009年第4期475-479,共5页Petroleum Exploration and Development

摘　　要：红海盆地主体为渐新世晚期开始发育的年轻裂谷盆地,总体勘探程度较低,尚未形成规模化商业开发,但地质评价显示红海盆地具备油气成藏的基本地质条件。Tokar地区位于苏丹红海南部水域,构造上属红海盆地中段西侧,先后经历了渐新世末和中新世末两次大的构造运动、裂陷—稳定—裂陷3个构造演化阶段,在盐上和盐下两个构造层形成了一系列构造圈闭:渐新世末主要形成基底卷入型构造,后中新世末则主要形成断层滑脱型构造和盐相关型构造,表现为潜山构造、披覆背斜、盐下原生背斜、盐上滚动背斜、盐上牵引背斜、盐拱背斜和盐墙遮挡圈闭等7种圈闭样式。根据油源、储集层和保存条件的对比分析,结合圈闭的规模和可靠程度,认为盐下原生背斜和盐上牵引背斜为最有利的勘探目标。As a younger rift basin developed from late Oligocene, Red Sea Basin possesses all necessary geological elements for hydrocarbon generation and accumulation concluded by integrated geological evaluation, though it has a low-degree of exploration and no commercial production. The Tokar area lies in the southern Sudanese Red Sea and is a part of the west flank of the middle section in Red Sea Basin. It experienced three tectonic evolution stages of rifting, stable and rifting, caused by twice large-scale tectonic movements. The early movement occurred in the end of Oligocene and generated basement-involved structures. The later one occurred in the end of Miocene and formed fault-slipped and salt-related structures. Totally seven structural styles have been identified as buried hill, drape anticline, pre-sah primary anticline, post-salt rollover anticline, post-sah drag anticline, salt-arched anticline and salt-sealed trap. According to the comparison of source, reservoir and seal rock as well as the traps＇ size and reliability of all seven structural styles, the pre-sah primary anticline and post-sah drag anticline are the most favorable exploration targets.

关 键 词：红海盆地 构造成因 圈闭样式 基底卷入 断层滑脱 盐相关 

分 类 号：TE122.1[石油与天然气工程—油气勘探]