琼东南盆地松南凹陷新生代重要构造幕及表现形式  

Cenozoic Tectonic Phases and Their Representing Shapes in Songnan Sag,Qiongdongnan Basin

作　　者：于俊峰 孙志鹏 朱继田 

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：《天然气地球科学》2010年第2期281-288,共8页Natural Gas Geoscience

基　　金："十一五"国家重大科技攻关期间部分研究成果(编号:2008ZX05023-004)资助

摘　　要：松南凹陷是琼东南盆地新生代构造活动最强烈的凹陷,是研究深水区大中型油气田成藏规律的典型凹陷。在对该凹陷主干剖面进行精细解释的基础上,全面描述了其构造沉积形式,并把松南凹陷演化划分为4个重要幕即始新世—早渐新世早期整体断陷幕、早渐新世晚期—晚渐新世局部断陷幕、晚渐新世晚期—中新世统一坳陷幕和中新世中期—第四纪新构造运动幕,阐述了各个演化幕的基本特点和重点构造沉积现象的成因,认为:自第二构造幕开始,除了F2断裂带,凹陷的其他基底断层基本停止活动,取而代之的是一些向凹陷方向倾斜的新断裂体系;区域坳陷期自T61沉积就开始,甚至更早;而上新世和第四纪并不是趋于沉寂,新构造运动主宰了凹陷的演化形式。最后分析了各构造幕构造运动对油气勘探的重要意义。The Songnan sag, as the most active tectonic sag in Cenozoic in Qiongdongnan basin,is a typical sample of deepwater exploration of large- and middle- oil and gas fields. In this paper, based on detailed interpretation of trunk seismic profiles and description of structural-sedimentary shapes, four structural phases in Songnan sag were divided, i.e. whole sag rifting phase within Eocene to early stage of early Oligocene, partial rifting phase during late stage of early Oligocene to late Oligocene, integral subsidence phase in late stage of late Oligocene to Miocene, Neotectonic phase during middle Miocene to Quaternary. We also discussed the basic feature of each phases and origin of important structural-sedimentary appearance. Since the second tectonic phase, the basement faults had ceased with except of F2 fault （corresponding to early Yacheng era to late Oligecene）, and new fault system toward sag was formed. And the regional subsidence had started since T61 sedimentary interface or 1st member of Lingshui Fro,or even more earlier, but stopped after T60 sedimentary interface. It is not structurally quiet during middle Miocene to Quaternary, suggesting that the new tectonic activity would dominate the evolution of sag at last phase. These tectonic phases to oil and gas exploration were also discussed.

关 键 词：琼东南盆地 松南凹陷 构造幕 新构造运动 

分 类 号：TE121[石油与天然气工程—油气勘探]