摘要
应用新采集的2D/3D地震数据和测录井资料,并结合前人研究成果,分析了宝岛—长昌凹陷三亚组三角洲—深水扇沉积体系的演化特征与分布规律,探讨了其物源特征及发育控制因素。研究表明:宝岛—长昌凹陷三亚组发育2个三角洲—深水扇沉积体系,凹陷中央发育一个大型深水扇。宝岛凹陷北坡三角洲沿北西—南东向展布,形态特征为南西窄、北东宽,面积约6 000km2,长昌凹陷北坡三角洲沿近南北向展布,面积约2 900km2,三角洲沉积物来源主要为海南岛地区。2个三角洲前缘位置均发育深水扇,展布方向与上游三角洲大致相同;宝岛—长昌凹陷中央发育一个呈"纺锤形"东西向展布的大型深水扇,面积约1 760km2,沉积物来源为长昌凹陷东侧隆起区。沉积体系的发育控制因素主要有构造运动、古地貌、物源供给量等。三角洲—深水扇沉积体系的发现,将为宝岛—长昌凹陷深水区中层油气勘探提供科学依据。
Based on the 2 D/3 Dseismic data,logging data and previous achievements,this paper identifies the evolutions and distributions of the Lower Miocene delta and deepwater-fan depositional system of Sanya Formation in Baodao-Changchang Depression,and analyzes the provenance characteristics and controlling factors of the sedimentary system development.The results show that there are two delta-deepwater-fan sedimentary systems of Sanya Formation in Baodao-Changchang Depression,and a large deepwater-fan developed in the center of the depression;the north slope delta of Baodao Depression,which is narrow in southwest and wide in northeast,is about 6 000 km^2,with a distribution direction of nearly NW-SE.The north slope delta of Changchang Depression is 2 900 km^2 with a distribution direction of nearly N-S,the sediments of the delta are mainly derived from Hainan Island.The deepwater-fan developed both in the two delta fronts,and the distribution directions are similar to that of the upstream delta.In the center of the Baodao-Changchang Depression,large deepwater-fan with a shape of ＂spindle＂ developed,with a distribution direction of E-W and an area of 1 760 km^2.The main controlling factors affecting the sedimentary evolution of the delta-deepwater-fan sedimentary system are the tectonic movement,the paleo geomorphology,the source supply and so on.The discovery of the delta-deepwater-fan depositional system could provide a basis for deepwater oil-gas exploration in the Baodao-Changchang Depression.
作者
晏英凯
韩银学
马明
陈国俊
吕成福
杨海长
陈莹
Yan Ying-kai Han Yin-xue Ma Ming Chen Guo-jun Lti Cheng-fu Yang Hai-zhang Chen Ying(Key Laboratory of Petroleum Resources ,Gansu Province/ Key Laboratory of Petroleum Resources Research, Institute of Geology and Geophysics ,Chinese Academy of Sciences , Lanzhou 730000,China University of Chinese Academy of Sciences ,Beijing 100049 ,China CNOOC Research Institute ,Beijing 100028 ,China)
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2017年第10期1565-1573,共9页
Natural Gas Geoscience
基金
国家科技重大专项(编号:2016ZX05026-007-005)资助
关键词
宝岛—长昌凹陷
三亚组
三角洲
深水扇
沉积演化特征
Baodao-Changchang Depression
Sanya Formation
Delta
Deepwater-fan
Sedimentary evolution
