摘要
松辽盆地属于大型陆相中生界含油气盆地,通过高分辨率三维地震资料分析,首次在中央坳陷区大庆长垣嫩江组一段湖相泥岩中发现了发育完整的大型湖底水道系统,该系统由3个主干水道和4个末梢分支水道构成,沿大庆长垣自北向南延伸,水道系统延伸最大直线距离71km,水道最大宽度600m。研究认为该水道系统可能为河流直接入湖而形成,电测解释和岩心观察表明水道砂体具有很好的含油气性。因此,这一水道系统的发现为在松辽盆地中央坳陷区广泛发育的湖相泥岩中寻找油气储层提供了一个新勘探领域,具有极其重要的石油地质意义。
The Songliao Basin is a large-scale Mesozoic continental petroliferous basin. Based on analysis of highresolution 3D seismic data, a large-scale lacustrine subaqueous channel system is identified in the lacustrine mudstone of the first member of the Nenjiang Formation in the central basin. This system is composed of 3 trunk channels and 4 tributary channels, and extended from north to south along the Daqing Placanticline with a maximum length of about 71 km and the largest width of about 600 m. This study indicates that this system may be resulted from river rushing into lake. Interpretation of logging and core indicates that there are rich petroliferous properties in these channel sand-bodies. Therefore, the discovery of this large-scale lacustrine subaqueous channel system will provide a new target for hydrocarbon reservoirs within the lacustrine mudstones in the central depression of the Songliao Basin.
出处
《地质学报》
EI
CAS
CSCD
北大核心
2006年第8期1226-1232,T0008,共8页
Acta Geologica Sinica
基金
"973"项目"白垩纪地球表层系统重大地质事件与温室气候变化"(编号2006CB701400)资助成果。
关键词
松辽盆地
湖底水道
几何形态
沉积特征
石油地质意义
Songliao Basin
lacustrine subaqueous channel
geometry pattern
depositional characteristics
petroleum geology
