龙门山北段泥盆系海口组砂岩储层特征

摘要

以四川盆地江油二郎庙地区中泥盆统海口组砂岩为研究对象，以储层综合评价为目的。在实测剖面和详细观察的基础上，运用薄片鉴定、扫描电镜、孔渗分析及 X 射线衍射等技术手段，按照主要储集空间类型进行分类讨论，研究矿物组分、粒度以及成岩作用和成岩演化模式对储层的控制作用，分析碎屑岩储层复杂孔隙的成因及其控制因素。结果表明海口组砂岩以原生孔隙为主，是典型的孔隙型储层。海口组砂岩可作为以原生粒间孔隙为主的典型储层模型，孔隙连通性极好，孔隙度和渗透率具有很好的正相关关系，排驱压力很低，喉道一般较大，孔隙结构较好，为优质储层类型。%The reservoir characteristics of the Haikou sandstone of Middle Devonian Series in Jiangyou of Sichuan Basin are studied on the basis of measured sections and drilling core observations. Controlling factors of main reservoir space,mineral components,grain size,diagenesis and the diagenetic evolution models are analyzed by thin section observation,scanning electron microscope, porosity and permeability statistics and X-ray diffraction,etc.It indicates that the Haikou sandstone is a typical pore-type reservoir characterized by dominant primary pores,and can be considered as a typical reservoir model mainly composed of inter-granular pores.In the Haikou sandstone,the connection among the pores is good,with good positive correlation between the porosity and the permeability.The displacement pressure for the pores is low and the throat is large,reflecting a good framework of the pores.Therefore,the Haikou sandstone possesses favorable conditions for the accumulation of oil and gas.