Zarzaitine油田海底扇沉积微相建模

Sedimentary micro-facie modelling for submarine fan in Zarzaitine Oilfield

建立沉积微相模型不仅能够定量预测沉积微相的空间展布,而且可以为“相控”储层参数模拟提供基础。任何建模方法都有一定的应用范围,目前没有能够直接建立海底扇沉积微相模型的模拟方法。针对阿尔及利亚Zarzaitine油田海底扇沉积特点和相建模方法的适用范围,提出了分步建立沉积相模型的方法。选择相序模拟法建立海底扇亚相模型;分别应用基于目标和指示克里金模拟方法建立中扇微相和下扇微相模型;在亚相模型的约束下,将中扇微相模型和下扇微相模型合成完整的海底扇沉积微相模型。模拟结果表明,应用分步相模拟建立的海底扇沉积相模型更接近地质认识,提高了沉积相的模拟精度。

Construction of sedimentary micro-facie models of submarine fan can not only predict the spatial distribution quantitatively,but also provide the base for facie-controlled petrophysical parameters modeling.As one modeling method can only be utilized within a limited scope,there is not a single modeling method that can construct the sedimentary micro-facie models of submarine fan up to now.Aiming at the sedimentary facies distribution features of submarine fan and the scope of application of facies modeling method,a multiple-step method of facies modeling is proposed.Firstly,facie transition simulation is screened to construct the sedimentary sub-facies model of submarine fan.Then,object based method and Kriging indictor are utilized to construct the sedimentary micro-facie of mid-fan and lower fan respectively.At last,constrained by the sub-facie model,the sedimentary micro-facie models of mid-fan and lower-fan are integrated into the whole sedimentary micro-facie model of submarine fan.The model by multiple-step method is more closely to that of the static geologic viewpoint.