层序地层学在陆相斜坡带隐蔽油气藏勘探中的应用

Application of Sequence Stratigraphy for Subtle Reservoir Exploration in Continental Slope Zone

为探索寻找隐蔽油气藏的方法 ,以东营凹陷为例 ,从层序和砂体成因等方面入手 ,应用钻井、测井及地震等资料 ,建立了渤海湾盆地东营凹陷沙三段中部地层的层序地层格架。在前人认识的基础上 ,首次将层序单元进一步细分 (相当于四级层序 ) ,该段地层共分为 4个层序。并且每个层序可分为低位体系域、水进体系域和高位体系域。建立了储油单元与层序单元 (尤其低位体系域 )对应关系。搞清了陆相盆地斜坡带沉积体系域中储集砂体类型和油气成藏机制 ,从而指导隐蔽油气藏勘探。最后 ,预测了含油气圈闭范围 ,提出勘探部署意见。

Sequence stratigraphy frame of the middle strata, Shasan Member in the Dongying Depression of Bohai Bay Basin, has been established based on the data of drilling well,logging well and seismic. It was the first time that sequence cell was further classified into 4 sequences (equivalent to fourth level sequence)with help of the previous research work. Each sequence consists of LST ,TST and HST.The corresponding relationship between the unit of oil storage and the unit of stratigraphic sequence has been established. Types of reservoir sandstone and the mechanism of oil and gas accumulation in continental basins, which guides oil and gas exploration, have been known very well. This paper ended with forecast of petroleum province and advice on exploration.