鄂尔多斯盆地甘谷驿油田上三叠统长6油层孔喉结构特征及其影响因素

长6油层为该区的主产层之一.为了确定造成长6油层低渗、特低渗的原因,对储层岩石学、沉积体系、孔喉结构及孔渗特征进行了综合分析,总结了长6油层的孔喉结构特征,进一步分析了其影响因素.结果表明:长6油层的孔喉结构主要为中、低孔—微喉型,孔喉结构的特征主要是受成岩作用的影响而形成的;长6油层这种中、低孔—微喉型孔喉结构控制了长6油层的产能,使长6油层成为低渗、特低渗型油层.

Characteristics of pore throat structure of Chang-6 oil-bearing bed in Ganguyi Oilfield,Ordos Basin

Chang-6 oil-bearing bed is one of the main producing formations in Ganguyi Oilfield,Ordos Basin.The characteristics of lithology,diagenism,pore throat structure and physical property of the reservoir and the factors of influencing the pore throat structure are analyzed in order to understand the reason why the reservoir is of low-permeability and super-low-permeability.It is held that the pore throat structure is the type of medium——small pore and microthroat,which is controlled by diagenism;the pore throat structure determines the productivity of Chang-6 oil-bearing bed and makes it become low-permeability and super-low-permeability reservoir.