摘要
受新生代大陆边缘拉张、印-欧板块碰撞、南海海底扩张等多种构造活动控制与影响,琼东南盆地经历了多期构造演化,形成了多凸多凹的构造格局。该盆地深水区负向构造单元主要有乐东、陵水、北礁、松南、宝岛、长昌等6个凹陷,正向构造单元主要包括陵南低凸起、松南低凸起和北礁凸起。通过层序地层和沉积相研究以及油气成藏条件分析认为,深水区凹陷内普遍发育始新统湖相泥岩和渐新统崖城组海岸平原相—半封闭浅海相泥岩2套主力烃源岩,存在渐新统陵水组、中新统三亚组2套区域储盖组合和滨海相砂岩、扇三角洲相砂岩、盆底扇砂岩、中央水道砂岩、生物礁(滩)灰岩等5种类型储集层,发育由一批大中型背斜、断背斜构造圈闭及大型地层岩性圈闭组成的6个有利构造带。在上述研究基础上,划分出以陵水、松南-宝岛、长昌、北礁凹陷为烃源灶的深水区4个含油气子系统,优选出中央峡谷构造-岩性圈闭带和长昌凹陷中央背斜构造带作为勘探首选的2个有利构造带,提出以钻探陵水X-1、长昌Y-1等目标为突破口,通过解剖中央峡谷构造-岩性圈闭带和长昌凹陷中央背斜构造带推动深水区勘探进程。
Under the control of several Cenozoic tectonisms,such as the continental margin extension,India-European plate collison and the seafloor spreading in South China sea,Qiongdongnan basin has undergone multiple stages of structural evolution,resulting in a tectonic framework with multiple uplifts and sags.In the deep-water area of this basin,there are 6 major negative structure units,including Ledong sag,Lingshui sag,Beijiao sag,Songnan sag,Baodao sag and Changchang sag,and 3 major positive units,i.e.Lingnan low-uplift,Songnan low-uplift and Beijiao uplift.According to a research on sequence stratigraphy and sedimentary facies and an analysis of hydrocarbon accumulation conditions,it may be concluded that there are two sets of major source rocks generally developed in these sags,i.e.Eocene lacustrine mudstone and Oligocene Yacheng Formation mudstone of coastal plain-semi-enclosed neritic facies;two regional reservoir-seal assemblages in Oligocene Lingshui Formation and Miocene Sanya Formation,and five types of reservoir,such as littoral sandstone,fan delta sandstone,basin fan sandstone,central channel sandstone and reef（biogenic beach） limestone,forming 6 favoralbe structural zones composed of medium-large anticline traps,faulted anticline traps and large stratigraphic-lithologic traps in the deep-water region.Based on these conclusions,four petroleum systems with a hydrocarbon kitchen each respectively in Lingshui,Baodao,Beijiao and Changchang sag are identified,and two favorable structural zones,i.e.the central canyon structural-litholigic trap zone and the central anticline zone in Changchang sag,are selected as the preferetial plays for exploration.Therefore,Lingshui X-1 and Changchang Y-1 prospects should be taken as the breakthrough points,and the two preferetial plays should be anatomized to promote hydrocarbon exploration in the region.
出处
《中国海上油气》
CAS
北大核心
2011年第1期7-13,31,共8页
China Offshore Oil and Gas
基金
国家"十一五"重大专项课题"南海北部深水区有利区带和目标评价(编号:2008ZX05025-06-04)"
"南海北部深水区富烃凹陷识别
储层预测与烃类检测技术(编号:2008ZX05025-03)"部分研究成果
关键词
琼东南盆地
深水区
油气成藏条件
有利构造带
勘探潜力
Qiongdongnan basin
deepwater region
hydrocarbon accumulation conditions
Favorable structure zones
exploration potential
