摘要
浅水湖盆三角洲与一般三角洲具有明显的差异,为弄清浅水三角洲的沉积特征和砂体分布规律,以现代沉积、地震属性反演和密井网区解剖,确定了两种特征截然不同的浅水湖盆三角洲,即枝状的分流河道型三角洲和连片的分流砂坝型三角洲(现代洞庭湖和鄱阳湖、尕斯N1—N21油田、BZ28和BZ26区块三维地震属性)。枝状三角洲骨架砂体发育的主体为天然堤,三角洲呈现出明显的树枝状,各朵体分散、朵体间不连接或通过决口水道连接。三角洲整体上不具备广阔的平原相带,呈现出窄条状的特征。分流砂坝型三角洲发育的主体是分流砂坝,砂呈现朵状、坨状,朵体发育集中,基本上呈现片状分布,在各朵体之间部位会发育分流间湾沉积,但常常因朵体增长而被填充,最终常表现为浅水沼泽。
Deltas in shallow water is very different from that formed in deeper water.Through modern deposits survey in Dongting and Poyong lacustrine,detailed correlation of sandstone in mature oil field（Gasi N1-N12）and seismic attributes analysis of BZ28 in Bohai Bay,two types of shallow water deltas were recognized according to the sandbody type and distibution.Sand framework is mainly made of distributary channel in the first one and the other one is mainly made of distributary bar.Sandstones are narrow and isolated in the delta mainly made of distributary channel,while sandstones are widespread and continuous in the delta made of distributary bar.
出处
《沉积学报》
CAS
CSCD
北大核心
2010年第5期933-944,共12页
Acta Sedimentologica Sinica
基金
国家科技重大专项(编号:2008ZX05010-003
2008ZX05007-002)
国家自然科学基金项目(批准号:40602013)联合资助
关键词
浅水湖盆三角洲
沉积模式
分流砂坝
分支河道
砂体形态
shallow water delta
facies model
distributary bar
distributary channel
sand geometry
