摘要
为弄清鄂尔多斯盆地延长组砂岩储层孔隙度与富铁绿泥石胶结的关系,运用铸体薄片、扫描电镜、电子探针等技术分析了砂岩的孔隙特征、岩石组分特征及孔隙与岩石组分的关系,认为绿泥石包膜对孔隙的保护作用有限,火山物质(火山灰杂基和火山岩岩屑)的碱性溶蚀是孔隙发育的主要原因,通过定量计算绿泥石的铁质来源,认为这种火山物质属于中-基性火山岩,在早成岩阶段A期7%～11%的中基性火山物质发生碱性溶蚀,产生了8%的碱性溶蚀粒间孔隙,同时生成了3%的孔隙衬里绿泥石.绿泥石胶结物的广泛分布只是指示成岩早期发生了大量的火山物质溶蚀并产生了可观的碱性溶蚀孔.
In order to figure out the relationship between reservoir porosity and iron-rich chlorite cementation,the pore characteristic,rock constituents and relationship between pore and rock constituents of sandstone were studied by using cast thin sections,scanning electron microscope and electron microprobe techniques. The study reveals that the pore-line chlorite offers limited protection to the porosity,and the greatest contribution to the porosity is alkaline dissolution of volcanic materials. The volcanic materials （matrix and grain） belong to medium-basic volcanics through quantitative calculation of iron content in the chlorite cementation. During the early diagenetic stage,A 7%-11% medium-basic volcanics were dissolved,and this alkaine dissolution process yielded 8% secondary porosity and 3% pore-lining chlorite. The widespread chlorite cementation just indicates that abundant medium-basic volcanics were dissolved and considerable alkaline dissolution pore was generated.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
2011年第1期103-110,共8页
Earth Science-Journal of China University of Geosciences
基金
国家重点基础研究发展计划"973"项目(No.2003CB214607)
国家自然科学基金项目(No.40372096)
关键词
碱性溶蚀孔
绿泥石胶结
火山物质
延长组
石油地质
alkaline dissolution
chlorite cementation
volcanic materials
Yanchang Formation
petroleum geology.
