琼东南盆地长昌凹陷新近系三亚组沉积相  

Sedimentary facies of Neogene Sanya Formation in Changchang Sag,Qiongdongnan Basin

作　　者：蔡佳 CAI Jia(CNOOC Research Institute,Beijing 100028,China)

机构地区：[1]中海油研究总院,北京100028

出　　处：《岩性油气藏》2017年第5期46-54,共9页Lithologic Reservoirs

基　　金：国家自然科学基金项目"典型断陷富油气凹陷层序构成样式的差异性研究"(编号:40872077);国家重大科技专项"近海富烃凹陷资源潜力再评价和新区;新领域勘探方向"(编号:2011ZX05023-001);"近海大中型油气田形成条件与分布"(编号:2011ZX05023-006)联合资助

摘　　要：长昌凹陷是琼东南盆地东部具有一定勘探潜力的地区,新近系三亚组为一套厚度巨大的海相砂泥岩地层,可分为2段,均是重要的储层。综合应用测井、重矿物、古生物、地震剖面等资料对物源进行对比与分析,在长昌凹陷三亚组共识别出5种主要的沉积体系:滨海、浅海、三角洲、半深海、海底扇。琼东南盆地深水区长昌凹陷在三亚组沉积期是中国南海北部一个大型的坳陷型海盆,在古地貌、物源输入等2个地质因素的共同作用下形成大型海底扇,厚度大,物性好,沿中央坳陷带轴向展布。三亚组大面积海底扇的发育形成了长昌凹陷最大规模的优质储层,具有成藏的独特优势,其与构造叠合所形成的构造-岩性油气藏是琼东南盆地深水区油气勘探获得突破最现实的领域。The Changchang Sag is an important potential hydrocarbon exploration area in the eastern Qiongdongnan Basin.The Neogene Sanya Formation is a set of huge marine sandstone and mudstone stratum,and it can be divided into two members,all of which are important reservoirs.Based on data of logging,heavy minerals,paleontology and seismic sections,the provenance and the sedimentary system of Sanya Formation were analyzed.There are five kinds of sedimentary systems,including coastal,neritic,deltaic,bathyal and submarine fan system.Changchang Sag is a large marine depression in northern South China Sea during the sedimentary period of Sanya Formation.Under the coaction of paleogeomorphology and provenance input,a large submarine fan was formed,which is characterized by great thickness,good physical properties and basin axial distribution.The the largest high-quality sandstone in the huge submarine fan has unique advantage of reservoir accumulation in Changchang Sag.The structural-lithologic reservoirs are the most realistic prospects for deepwater hydrocarbon exploration in Qiongdongnan Basin,which is formed by its superposition with structure.

关 键 词：海底扇 坳陷型海盆 物源体系 三亚组 琼东南盆地 

分 类 号：TE121.3[石油与天然气工程—油气勘探]