摘要
涠西南凹陷是南海北部湾盆地重要的富烃凹陷之一。通过开展涠西南凹陷斜阳斜坡涠洲组的油气成藏要素及其时空匹配关系方面的研究,得出该区具有优异的成藏条件:流沙港组二段是最主要的烃源岩层,达到好~优的生油岩级别;发育多套储盖组合,其中涠三段储集砂体较为发育,储层物性好,多数为中孔中渗储层;圈闭类型主要为构造圈闭与岩性-构造圈闭,且纵向叠合性较好,是油气良好的聚集场所;沟源断裂与三角洲储集砂体的有效配置构成了高效的油气疏导体系。此外成藏要素时空匹配对油气成藏的控制作用表现在以下两个方面:(1)油藏均沿源断裂分布;(2)距离流二段源岩越近的圈闭越有利油藏形成。在此深入分析的基础上,通过钻探发现了涠洲6-D中型油田,最终证实了斜阳斜坡巨大的勘探潜力。
The Weixinan sag is one of the major sags rich in oil and gas in the Beibu Gulf basin,South China Sea.The critical factor of petroleum accumulation and spatial matching was studied.The results show that this area has excellent accumulation conditions.The member 2 of the Liushangang Formation is the most important source rock.It is ranked as good-excellent source rocks.The area has several sets of reservoir-cap rock assemblage.The member 3 of the Weizhou Formation has rich reservoir rocks and exhibits the best reservoir properties,with middle porosity and middle permeability.And the traps are dominated by structural and lithological-structural traps,have good longitudinal overlapin in the area.Moreover,the area is a good place hydrocarbon migration and accumulation.Rift connecting the source rocks and delta reservoir play an efficient oil and gas dredging system.The control effect of space matching on hydrocarbon ccumulation was showed in the following two aspects.①Oil reservoirs are all distributed along source faults.②The shorter the distance from trap to source rock,the better it is to form oil reservoir.Based on the depth analysis,founded the Weizhou 6-D medium oilfield,and finally confirmed by the Xieyang slope of great exploration potential.
作者
邹明生
严恒
高凌
王丽君
谢超
ZOU Ming-sheng;YAN Heng;GAO Ling;WANG Li-jun;XIE Chao(Zhanjiang Branch,CNOOC China Limited,Zhanjiang 524057,China)
出处
《科学技术与工程》
北大核心
2018年第7期113-119,共7页
Science Technology and Engineering
基金
"十三五"国家科技重大专项(2016ZX05024-006)资助
关键词
涠西南凹陷
涠洲组
成藏关键因素
油气勘探
Weixinan depression
Weizhou formation
critical factor of petroleum accumulation
petroleum exploration
