莺歌海盆地东方1-1气田上新统莺二段源-渠-汇研究  

Study on source-channel-sink of the pliocene YingⅡmember at the Dongfang1-1 gas field in Yinggehai Basin

作　　者：周伟 张磊岗 马勇新 杨楷乐 管琳 高雨 陈硕 ZHOU Wei;ZHANG Leigang;MA Yongxin;YANG Kaile;GUAN Lin;GAO Yu;CHEN Shuo(Zhanjiang Brancn, CNOOC Ltd., Zhanjiang 524057, China;Department of Geology/State Key Laboratory of Continental Dynamics, Northwest University, Xi′an 710069, China)

机构地区：[1]中国海洋石油集团(中国)有限公司湛江分公司,广东湛江524057 [2]西北大学地质学系/大陆动力学国家重点实验室,陕西西安710069

出　　处：《西北大学学报（自然科学版）》2021年第3期459-469,共11页Journal of Northwest University（Natural Science Edition）

基　　金：国家科技重大专项基金资助项目(2016ZX05026007-007);中海石油有限公司综合科研基金资助项目(ZYKY-2019-ZJ-03)。

摘　　要：以莺歌海盆地东方1-1气田上新统莺二段为研究对象,运用碎屑锆石U-Pb测年、重矿物物源分析及地震剖面渠汇分析技术,系统研究莺二段的物源与渠汇沉积背景。碎屑锆石测年分析表明,东方1-1气田上新统莺二段主体表现出北部(越南北部)、西部(越南中部)混合物源的年龄特征,东物源(海南岛物源)峰值年龄微弱存在;重矿物物源分析显示,莺歌海盆地上新统莺二段西部、北部、东部3个物源方向物源都有发育,并显示出明显的、不同方向特性重矿物差异性特征,西部物源特性重矿物为磁铁矿,北部物源特性重矿物为磁铁矿、帘石类,东部物源特性重矿物为锆石、电气石。渠-汇分析揭示,东方1-1气田上新统莺二段西侧和北侧都发育水道渠,西物源从西向东、北物源从北向南前积沉积,但从东向西的前积不明显。研究后认为,东方1-1气田莺二段以西部及北部混合物源为主,东部物源影响有限。Taking the YingⅡmember of the Pliocene in the Dongfang1-1 gas field in Yinggehai Basin as a research objective,this paper uses detrital zircon dating heavy mineral provenance analysis and seismic profile channel-sink analysis techniques to systematically study the source and channel-sink sedimentory background of the YingⅡmember of Yinggehai Basin.Detrital zircon dating analysis shows that the main body of the YingⅡmember of the Pliocene in the Dongfang1-1 gas field displays the age characteristics of mixed provenances from the north(the northern Vietnam)and the west(the central Vietnam),with very wake peak age from the eastern provenance(provenance from Hainan Island).Heavy mineral provenance analysis shows that three direction provenances from the west,the north and the east of Yinggehai Basin developed,and there are obviously particular heavy mineral characteristics of different direction provenances in the YingⅡMember of the Upper Eocene,which shows particular heavy mineral or minerals is magnetite in the west,magnetite and porphyrite in the north,and zircon and tourmaline in the east.Analysis of channels and sinks revealed that water channels developed both at the west and the north in the Pliocene YingⅡMember of Dongfang1-1 gas field,the west provenance of Pliocene prograded from west to east,and the north provenance prograded from north to south,but the prograding from east to west was indistinct.The above analysis shows that the YingⅡmember of the Dongfang1-1 gas field is dominated by the mixture of western and northern provenances,with very little influence from the east provenance.On the basis of the source-channel-sink study and sedimentary background of the YingⅡmember of the Pliocene,a converge and deposit model from different provenances of coastal neritic limited basin of multi-sources at the Dongfang1-1 gas field is established.

关 键 词：源渠汇 锆石测年 水道渠 莺歌海盆地 莺歌海组莺二段 

分 类 号：TE121[石油与天然气工程—油气勘探]