摘要
从岩芯、薄片、扫描电镜以及FMI成像测井等资料分析发现,济阳坳陷陡坡带深层砂砾岩体储层次生孔隙发育,大量发育的次生孔隙不仅增大了储层的有效储集空间,更重要的是改变了储层的孔隙结构,使储层孔喉增大,大大提高了储层的渗透性能。研究认为长石、岩屑、碳酸盐和硫酸盐等酸性组分的溶蚀以及构造运动是深层次生孔隙形成的主导因素。垂向上存在两个次生孔隙发育带,对应深度范围从上至下依次为3450～3850m和4075～4550m。其主要形成机理有:①有机质热演化过程中产生的酸性流体的溶蚀作用;②去石膏化和去白云化以及硫酸盐热化学作用;③异常高压加速有机质热演化和对已形成孔隙的保护作用;④构造作用、脱水收缩作用等。
Based on analysis of drilling cores, thin section, SEM and FMI imaging logging data, it is found that the steep slope belt of the Jiyang Depression hosts abundant secondary porosity, which expands the space of reservoir, and more importantly, changes pore geometry to enlarge pore-throat and effectively improve reservoir permeability. The research also indicates that dissolution of acidic components such as feldspar, debris, carbonate and sulfate and tectonic activity are the major factors triggering development of deep secondary porosity. There exist two vertical belts of secondary porosity, with depths ranging from 3450 to 3850 meters and from 4050 to 4575 meters. The main mechanisms are： The main mechanisms are： ① dissolution by acidic fluid derived from thermal evolution of organic matter; ② degypsification, dedolomitization and thermochemical sulfate reduction; ③ high pressure accelerates organic matter evolution and offers protection to existing porosities; ④Tectonism, dehydration and contraction, etc.
出处
《地质学报》
CAS
CSCD
北大核心
2008年第8期1152-1159,I0001,共9页
Acta Geologica Sinica
基金
国家自然科学基金项目(编号405003003)资助成果
关键词
次生孔隙
孔隙结构
构造运动
有机质热演化
溶蚀作用
secondary porosity
pore structure
Tectonic movement
thermal evolution of organic
dissolution
