同沉积构造坡折带对岩性油气藏富集带的控制作用——以渤海湾盆地古近系为例

发育同沉积构造坡折带是断陷盆地的基本特征。根据对渤海湾盆地的凹陷构造发育特征与层序发育形式的研究，同沉积构造坡折带按成因可划分为两类：同沉积断裂构造坡折带和同沉积背斜构造坡折带。前者根据其平面组合特征划分为5种样式：帚状断裂构造坡折带、陡坡平行（断阶）状断裂构造坡折带、缓坡平行（断阶）状断裂构造坡折带、交叉状断裂构造坡折带和梳状断裂构造坡折带；后者据成因划分为2种样式：同沉积披覆背斜构造坡折带、同沉积逆牵引背斜构造坡折带。盆缘沟谷与7种构造坡折带样式的组合不但控制了层序低位域砂岩、砾岩体的发育及其展布方向，而且控制了优质烃源岩的发育和油气的运聚特征，从而控制了岩性油气藏富集带的分布。

Syndepositional structural slope-break zone controls on lithologic reservoirs --A case from Paleogene Bohai Bay Basin

Syndepositional structural slope-break zone is a basic characteristic of rift-subsidence basin.According to the formation origin,syndepositinal structural slope-break zone can be divided into syndepositional fault structural slope-break zone and syndepositional anticline structural slope-break zone.Five syndepositional structural slope-break zone patterns are identified according to their fault distributions on the horizontal level,as "brush","steep parallel","gently parallel",("crossed"),and "comb-like".Two syndepositinal anticline structural slope-break zone patterns are also identified as antithetic dragged anticline and drape anticline.The combinations of 7 syndepositional structural slope-break zone patterns and grooves on basin edge control low-stand tract sand bodies,good source rocks and hydrocarbon accumulation,and accordingly control the development and distribution of lithologic oil reservoirs.