塔里木盆地巴楚—麦盖提地区泥盆系东河塘组储层孔隙结构特征及其影响因素

Pore structural characteristics and influencing factors of the Devonian Donghetang Formation reservoir in Bachu——Maigaiti area,Tarim Basin

通过对钻井岩心的镜下观察并结合压汞分析测试研究表明,塔里木盆地巴楚—麦盖提地区泥盆系东河塘组储层砂体孔隙类型以原生孔隙为主,其次为次生孔隙;其中原生孔隙以剩余粒间孔隙为主,次生孔隙以溶蚀孔隙为主。孔隙喉道细,孔渗条件差,属于特低孔超低渗、超低孔超低渗储层。孔隙结构可分为3类,以第Ⅲ种类型为主(75%)。储层孔隙结构特征受成岩作用及沉积作用的影响,其中成岩作用是主要的影响因素。

The pore structural characteristics of Devonian Donghetang Formation reservoir in Bachu——Maigaiti area of Tarim Basin has been studied combined with mercury analysis testing and SEM observation of drill cores.The results show that the pores of reservoir sands are mainly primary pores（residual intergranular pores） in type,followed by a few secondary pores（dissolution pores）.The reservoirs are characterized by very low porosity and ultra-low permeability,belonging to ultra-low porosity and ultra-low permeability reservoirs with thin pore throat and poor porous condition.The pore structure can be divided into three types,in which the type Ⅲ is the main one（75%）.The pore structural characteristics are influenced by the diagenesis and sedimentation,in which diagenesis is the main influencing factor.