摘要
准噶尔盆地车排子地区新近系沙湾组油藏具有隐蔽性和复杂性的特点。根据录井、测井及取心资料分析,认为车排子地区新近系沙湾组发育典型的辫状河扇沉积,并具有砂砾岩体较为发育的特点。研究区辫状河扇砂体呈宽阔的席状展布,沉积构造以多种类型的交错层理为主;可划分为辫状河扇近端、中部和远端3种亚相,其中近端亚相和中部亚相发育广泛的辫状河道沉积,中部亚相可进一步划分为辫状河道、河道砂坝和河道间3种沉积微相。由于辫状河道改道频繁、极不稳定,导致各沉积微相之间分异不明显,辫状河道与河道砂坝叠置出现;在层序韵律上具有向上变细的正韵律特征,测井曲线上表现为自然伽马、自然电位曲线呈箱形、钟形负异常。车排子地区沙湾组储层为来自西南和西北方向的辫状河道砂体,单砂体呈条带状展布,纵向上叠加连片,与构造相互配置,可形成大范围分布的复杂岩性油气藏。
The sedimentary characteristics of Neogene Shawan formation reservoirs are subtle and complex.Based on the regional geological condition,existing core,logging and other various geological material,we analyzed the sedimentary characteristics of Shawan formation.The Shawan formation mainly developed braided river fan sedimentary system,which can be divided into three parts including proximal subfacies,middle subfacies,and distal subfacies.The middle subfacies,and proximal subfacies are developed with wide range of braided river sedimentation,and can be divided into braided river,channel bar,and distributary between sedimentary microfacies.The content of sandy conglomerate is high,and the lithologic is coarse,which has less fine grained suspended sediment.The logging curve feature in study area is apparent.The Shawan reservoir is made up of the channel sand body which is from the southwest and northwest,and formed the large complex lithology reservoir distribution.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2013年第4期30-32,36,共4页
Petroleum Geology and Recovery Efficiency
基金
国家科技重大专项"大型油气田及煤层气开发"(2009ZX05009-001)
关键词
新近系
沙湾组
辫状河扇
沉积特征
车排子地区
Neogene
Shawan formation
braided river fan
sedimentary characteristics
Chepaizi area
