鄂尔多斯北部盆地古流体动力场的演化特征

EVOLUTIVE CHARACTERISTIC OF PALAEOFLOW FIELD IN NORTHERN ORDOS BASIN

以鄂尔多斯北部盆地为例 ,针对古流体动力场的演化问题 ,应用三维数值模拟技术 ,恢复了上古生界不同时期地层厚度和地质、水文地质条件 ;推导了考虑多个要素的地下流体三维数学模型 ,并依据不同时期古流体动力场特征 ,初步分析了上古生界油气的运移聚集规律。结果表明 ,在鄂尔多斯北部盆地 ,运用三维数值模拟方法能够比较完善地描述古流体动力场的特征和比较准确地指明油气运移和聚集区带 。

Taken the northern Ordos basin as example,the research focuses on the evolution of palaeoflow field with 3D numerical modeling to revert the strata thickness,geologic and hydrogeologic conditions in different era of late palaeozoic,First,the palaeozoic stratum thickness is different era is reverted according to the compression equation,the geologic and hydrogeologic conditions in different era are reverted,too.Second,based on the conceptual model of palaeohydrogeology,the mathematics model describing the palaeoflow and accounting for several factors,such as compression,hydrocarbon yield and dehydration of clay mineral,is deduced.The finite difference approach is used to solve the mathematics model.The result indicate that the evolvement of palacoflow field can be perfectly demonstrated by using three dimensional modeling of palaeoflow in northern Ordos basin,and the favorable arca,in which the oil and gas is probably stored,can be ascertained.