涠西南凹陷涠洲11洼油气成藏条件及下步勘探方向  

The Hydrocarbon Accumulation Conditions and the Exploration Direction in Weizhou Sag 11 of Weixi'nan Depression

作　　者：宫立园 柳智萱 付大巍 黄英鑫 GONG Liyuan;LIU Zhixuan;FU Dawei;HUANG Yingxin(Zhanjiang Branch of CNOOC(China)Ltd.,Zhanjiang,Guangdong 524057,China)

机构地区：[1]中海石油(中国)有限公司湛江分公司,广东湛江524057

出　　处：《海洋石油》2025年第1期20-25,共6页Offshore Oil

摘　　要：涠西南凹陷涠洲11洼是一个勘探新领域,目前已发现两个含油构造,证实该洼具有较大的勘探潜力,然而对其烃源发育特征、有利勘探层系及油气运移方向等关键成藏问题尚未进行系统的研究,导致勘探方向不明。为明确该区的有利勘探方向,该文在钻井、三维地震资料及化验分析资料基础上,重点对涠洲11洼油气成藏条件及成藏主控因素展开分析。结果表明:涠洲11洼烃源条件好,断裂-源岩配置关系决定其近源成藏的特征;涠洲11洼流二段发育大型扇三角洲储集体,储层条件良好;依据已钻井成藏特征及断裂体系发育特征,指明洼陷西斜坡构造脊线是涠洲11洼油气优势运移方向。文章首次对涠洲11洼成藏条件展开详细研究,明确了成藏主控因素,指明了下步有利勘探方向,研究成果对涠洲11洼下步勘探提供重要指导。Weizhou Sag 11 in Weixi'nan Depression is a new exploration survey,in which two oil-bearing structures have been discovered.It's confirmed that the sag has great exploration potential.However,there is still a lack of systematic research on the key reservoir formation issues:hydrocarbon source development characteristics,favorable exploration layers and oil and gas migration directions,which leads to the exploration direction is blurry.In order to clarify the favorable exploration direction of the area,this article focuses on the analysis of the oil and gas accumulation conditions and main controlling factors in Weizhou Sag 11 based on drilling,3D seismic data and laboratory analysis data.The results show that:Weizhou Sag 11 is of good hydrocarbon source conditions and the characteristics of near source accumulation,which is determined by fault-source configuration relationship.A large scale of fan delta reservoir is well-developed in the second member of Liushagang Formation of Weizhou Sag 11.Based on the characteristics of drilled reservoirs and the development of fault systems,it is indicated that the structural ridge line of the western slope of the depression is the dominant direction for oil and gas migration in the sag 11.The article is the first to conduct a detailed study on the accumulation conditions of Weizhou Sag 11,clarifies the main controlling factors of reservoir formation,and points out the favorable exploration directions.The research results provide favorable guidance for the further exploration of Weizhou Sag 11.

关 键 词：成藏条件 流二段 涠洲11洼 涠西南凹陷 

分 类 号：P618.13[天文地球—矿床学]