层序地层学在松辽盆地隐蔽油气藏勘探中应用

为了揭示松辽盆地南部坳陷期隐蔽油气藏的分布规律,采用理论分析的方法.综合钻井、测井、地震等各种资料,将坳陷期地层划为9个三级层序,其内部结构具有三分和二分两种.并分析了层序地层特征及其与油气的关系,其中二分层序以下生上储型油藏组合为主,三分层序以上生下储型油藏组合为主.研究结果表明各级层序界面(层序边界、初泛面、最大湖泛面)与油气藏关系密切,其中初泛面控制着低位岩性油气藏的形成,最大湖泛面和层序边界控制着地层油气藏的形成.

Application of sequence stratigraphy to subtle reservoir exploration in Southern Songliao Basin

The distribution of subtle reservoir of Southern Songliao Basin is studied using the theories of sequence stratigraphy.Based on drilling,logging and seismic data,formation of depression period of Southern Songliao Basin be divided into nine third-order sequences,and third-order sequence is further divided into three systems tract or two systems tract.The paper discusses the sequence stratigraphy characteristic and the relationship of sequence stratigraphical units and oil and gas,reservoir combination of generation lower zones and preservation in upper zones is main in dichotomy sequence,reservoir combination of generation upper zones and preservation in lower zones is dominant in tripartition sequence.The results showed that the distribution of subtle reservoir is mainly controlled by surfaces of sequence,i.e.sequence boundary(SB),first flooding surface(FFS) and maximun flooding surfaces(MFS),the FFS is the important factor of controlling the formation of lithologic hydrocarbon reservoir in the lowstand system tract(LST),the SB and the FFS is the important factor of controlling the formation of stratigraphic hydrocarbon reservoir.