断陷湖盆可容空间变化特征的模拟实验研究

Simulation experiment on the changed characteristics of the accommodation in faulted lacustrine basins

以东营凹陷古近纪断陷湖盆为原型,在室内水槽实验的基础上,研究了断陷湖盆在构造差异沉降、沉积物供给和气候变化背景下可容空间的变化特征。由构造差异沉降、沉积物供给造成的可容空间变化在湖盆的不同部位具有非统一性,可容空间存在增加带、减小带以及两者之间的转换带;气候变化造成的可容空间变化在全盆地具有统一性,在干旱气候条件下可容空间统一减小,而在潮湿气候条件下闭流湖盆可容空间统一增加,敞流湖盆可容空间稳定不变。构造差异沉降、沉积物供给和气候变化等不同因素控制下的可容空间变化特征模型的建立,有助于断陷湖盆层序地层对比研究以及隐蔽油气藏的勘探。

The changed characteristics of accommodation in faulted lacustrine basins in Eogene system of Dongying Depression under the background of tectonic differential settlement and climatic change and sediment supply was researched based on the flume experiment. The change of accommodation caused by tectonic differential settlement and sediment supply is not additional or reductive conformably on different locations in the lacustrine basin,the accommodation has additional zone,reductive zone and transform zone. The change caused by climate is conformable in all lacustrine basins; the accommodation is reductive in dry climate and additional (closed lake) or sustained (open lake) in humid climate. The change characteristics model of accommodation under the background of tectonic differential settlement,climate and sediment supply is helpful for the correlation of sequence stratigraphy and the exploration of subtle reservoirs in the fault lacustrine basins.