致密油聚集模型与数值模拟探讨——以鄂尔多斯盆地延长组致密油为例

致密油可划分为页岩油、互层或夹层型致密油和邻源型致密油3种，根据它们的地质特点和成藏机理建立成藏模型。结果认为：页岩油的成藏过程很特殊，既没有经历二次运移也没有进行初次运移，只发生原始运移：互层或夹层型致密油属于自生自储型，是初次运移的结果；邻源型致密油是一种过渡型油藏，介于初次运移与二次运移之间。是“膨胀力”驱动的结果，．基于这种认识，提出“膨胀流”驱动论，并以此为基础建立了邻源型致密油数值模型、互层或夹层型致密油的自生自储数值模型及页岩油数值计算的容积法模型。应用实例证明，该技术具有较好的应用前景．．

Accumulation models and numerical models of tight oil:A case study from Yanchang Formation in Ordos Basin

Tight oil can be divided into shale oil, sandwich type tight oil and adjacent source type tight oil. According to their geological characteristics and accumulation mechanism, the accumulation models were established. The result shows that： （1） the shale oil accumulation process is very special, it neither experienced second migration nor primary migration, only experienced initial migration; （2） sandwich type tight oil belongs to self-generation and self-accumulation, and it is the result of primary migration; （3） adjacent source type tight oil is a kind of transitional reservoirs, its migration is different from primary and second migration, and it is the driving result of ＂expansion force＂. Based on this understanding, this paper proposed the ＂expanded flow＂ driving theory, and established adjacent source type tight oilnumerical model, sandwich type tight oil numerical model based on self-generation and self-accumulation, and the volumetric method model of shale oil numerical calculation. Application example proves that this technique has a good prospect of application.