鄂尔多斯盆地合水油田油藏储层特征建模分析

Modeling and analysis of reservoir characteristics in Heshui oilfield,Ordos Basin

针对鄂尔多斯盆地合水油田区域油气资源开发的需求,建模分析鄂尔多斯盆地合水油田油藏储层特征,为油气资源勘探提供科学依据。以鄂尔多斯盆地合水油田庄211井区为例,通过测井数据确定油藏储层孔隙度与渗透率参数,建立三维地质模型,通过变差函数,获取油藏储层物性参数的空间分布特征。研究结果表明:该方法可有效建立庄211井区的三维地质模型;该井区的储层具备复合韵律特征,利于形成油藏;该井区储层渗透率具备非均匀质特征;渗透率为1.4 mD左右时,油藏开发效果最佳,即储层有效厚度的渗透率下限是1.4 mD,储层有效厚度的孔隙度下限为9%;当渗透率为1.1、1.2 mD时,油藏最终采收率最高的水平段为1000 m,渗透率为1.3、1.4、1.5 mD时,油藏最终采收率最高的水平段为800 m,为后期油气资源开采提供科学依据。

Aiming at the demand of regional oil and gas resources development in Heshui oilfield of Ordos Basin,the reservoir characteristics of Heshui oilfield are modeled and analyzed,which provides scientific basis for oil and gas resources exploration.Taking Zhuang 211 well area of Heshui oilfield in Ordos Basin as an example,the porosity and permeability parameters of reservoir are determined by logging data,and a three-dimensional geological model is established.The spatial distribution characteristics of reservoir physical parameters are obtained by variation function.The result shows that this method can effectively establish the three-dimensional geological model of Zhuang 211 well area.The reservoir in this well area has compound rhythm characteristics,which is conducive to the formation of oil reservoir.The permeability of reservoir in this well area is non-uniform.When the permeability reaches about 1.4 mD,the reservoir development effect is the best,that is,the lower limit of permeability and porosity of effective thickness of reservoir is 1.4 mD and 9%respectively.When the permeability is 1.1,1.2 mD,the ultimate recovery of the reservoir is 1000 m,and when the permeability is 1.3,1.4,1.5 mD,the ultimate recovery of the reservoir is 800 m,which provides scientific basis for later oil and gas resource exploitation.