摘要
在对孤岛地区上第三系馆陶组河流沉积体系空间展布及垂向演化研究的基础上 ,应用高分辨率层序地层学理论 ,分析并建立了该区馆陶组河流沉积高分辨率层序地层模型。认为孤岛地区馆陶组河流沉积层序总体上是一个完整向上变细的正旋回序列 ,且其演化是脉冲式的 ,其中馆 33、馆 35、馆 42 、馆 44 、馆 53、馆 63砂体厚度大 ,分布面积广 ,是本区最好的一类油层 ;基底沉降速率与沉积物沉积速率或供给速率的平衡关系是控制砂体空间展布的根本原因 ;馆陶组地层对应 2个长期基准面旋回 (三级 ) ,即馆上段和馆下段 4个中期基准面旋回 (四级 ) ,即下部 (馆 7、馆 8)、中下部 (馆5、馆 6)、中上部 (馆 3、馆 4)和上部 (馆 1+2 ) ;短期旋回基本上与油砂体规模的地层单元相当 ,可用于解释油砂体的叠加和迁移。图 3参 2 (刘建民摘 )
Based on the research about spatial distribution and vertical evolution of fluvial sedimentary system of Guantao Formation of Upper Tertiary, Gudao area, a high resolution sequence stratigraphy model of Guantao Formation in Gudao area was established by using the theory of high resolution sequence stratigraphy. It is pointed out that (1)the fluvial sediments in Guantao Formation of Gudao area is a complete positive cyclic succession within that the grain is fining upward, and its evolution is pulsatile, of which Guan3~3, 3~5, 4~2, 4~4, 5~3 and 6~3 sand bodies are thick and widely distributed, they are the best kind of reservoir in this area; (2)the balance between the rate of settling of the basement rock and the deposition or supplying rate of the sediment is the root causing that controls the spatial distribution of the sand body; (3)Guantao Formation is corresponding with two long-term datum plane cycles (third order)-Upper Guan and Lower Guan Members and four mid-term datum plane cycles (fourth order)-Lower (Guan7 and 8), Mid-Lower (Guan5 and 6), Mid-Upper (Guan3 and 4) and Upper (Guan1+2) parts; and (4)short-term cycle is basically corresponding with stratigraphic unit of a oil-bearing sand body, which can be used for explaining the superposition and movement of oil sand bodies.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2000年第6期31-32,44,共3页
Petroleum Exploration and Development
关键词
油田
孤岛地区
馆陶组
河流沉积地层
层序地层
Fluvial sediment, High resolution, Sequence stratigraphy, Model, Gudao oil field
