海底扇水道储层参数建模新思路——以西非A油田为例

海底扇水道以深水重力流沉积为主，由于其成因机制复杂，导致岩石相类型多样，储层孔、渗分布复杂且相关性差，这给其储层参数建模带来一定的困难。以西非A油田为例，通过深入分析海底扇水道储层特征及其与地震属性的关系，在常规的“相控协同”建模的基础上，提出了一种适合于海底扇水道储层的“多级相控约束，多重属性协同”的储层参数建模新思路。与常规的相控建模相比，该思路在孔隙度建模中不是单纯的“沉积相控”，而是在相构型建模约束下建立储集相模型，并以储集相模型约束建立孔隙度模型；考虑到深水水道砂体整体孔、渗关系差，但不同岩石相的孔、渗关系较好，故在渗透率建模中增加了“岩石相控”；同时，在常规的协同建模的基础上，该思路还增加了地震属性协同建立储集相模型的环节。

New method for reservoir petrophysical modeling of submarine fan channels:A case from Oilfield A in West Africa

Submarine fan channels,mainly deep-water gravity flow deposits,are generally characterized by diverse lithofacies types and poor correlation of porosity-permeability due to the complicated genetic mechanisms,which brings significant challenges to reservoir petrophysical modeling.Taking oilfield A in West Africa as an example,this paper proposes a new method for reservoir petrophyscial modeling of the submarine fan channels based on a comprehensive analysis of re-servoir features and their correlation with seismic attributes.This method features in "multi-facies control and multi-attributes collaboration".In contrast with the traditional facies-controlled modeling in which porosity modeling is simply controlled by sedimentary facies,this method first builds a reservoir facies model under the control of facies architecture model and then build porosity model under the control of the reservoir facies model.Given that the deep-water channel sandbodies show poor porosity-permeability correlation as a whole but good porosity-permeability correlation for different lithofacies,this method further supplements "lithofacies-control" in permeability modeling.Besides,this method also adds seismic-collaboration in the reservoir facies modeling in comparison with the common collaborative modeling.