济阳坳陷油藏类型及属性分布有序性

Ordered distribution of reservoir type and its attributes in Jiyang depression

中国东部古近系断陷盆地构造、沉积充填的连续性特征,控制了其圈闭类型、输导体系、成藏动力结构的连续性特征,形成了盆地内油藏连续分布、类型有序、纵向叠置、横向毗邻和复式富集的油气成藏模式。对济阳坳陷不同层次地质单元油藏分布序列进行分析,各凹陷、二级层序、大规模沉积体系内部油藏类型均呈现岩性油藏—构造油藏—地层油藏的有序分布特征。在宏观成藏地质要素及油藏类型分布表现出有序性的同时,含油饱和度、排驱压力、中值压力等油藏微观属性也表现出有序变化的特征,表现了与宏观地质规律的成因对应性。另外,盆地不同层次地质单元油藏分布序列也存在差异性,主要体现在某一类型油藏的缺失或各类型油藏在资源配比上的不均衡性。

The structural evolution in Paleogene continental rift basin of east China and the successive sedimentary filling pattern control the trap type,the carrier system and the dynamic continuity of reservoiring,resulting in continuous reservoir distribution,ordered reservoir type and complicated hydrocarbon accumulation model characterized by vertical superposition and lateral adjacency. Through the analysis of reservoir distribution sequence of different levels of geologic unit,reservoir types in sags,second-order sequences and large-scale sedimentary systems usually distributed in an order as follows:lithologic reservoir-structural reservoir-stratigraphic reservoir. Corresponding to the macroscopic geological elements of reservoir-forming and the ordered reservoir types,the microscopic reservoir attributes,including oil-bearing saturability,displacement pressure and median pressure,show ordered-changing patterns accordingly. On the other hand,differences exsit in reservoir distribution sequence for different levels of geologic unit of the basin,mainly include the absence of some kind of reservoir type and the unbalanced resources proportioning between different reservoir types.