摘要
通过CT扫描、比表面积及孔径分析、脉冲渗透率测试等实验手段,对马朗凹陷芦草沟组泥页岩储层微观特征及其地质意义进行研究。芦草沟组泥页岩微观储集空间类型多样,大小在几纳米到十几微米不等,其中以宏孔为主,无机矿物和有机质中均可发育较大孔隙;芦草沟组二段中部的微孔隙开放程度最高,岩石基质渗透性也相对最好;黏土矿物可明显增加岩石的比表面积,碳酸盐岩、长石的质量含量与比表面积成反比,有利于分布集中、直径较大的孔隙形成。石英(包含自生石英)可通过增强泥页岩的脆性形成微裂缝,抵抗压实作用保护微孔隙,明显改善了泥页岩物性,其有利作用要大于因自生石英形成而阻塞孔隙产生的不利影响。马朗凹陷芦草沟组泥页岩的微观地质条件有利于游离态页岩油的富集与渗流,是该区建成页岩油产能的重要微观地质原因。
To study the microscopic geological characteristics and geological significance of Lucaogou Forma- tion shale reservoir in Malang Sag. Based on CT scan, specific surface area and pore size analysis, pulse per- meability experiment and some other methods, Lucaogou Formation shale reservoir has various reservoir space types, and micro-pore size ranges from a few nanometers to several microns. Macro pore accounts for a large proportion, and inorganic minerals and organic matter both can help the existence of larger pores. The micro- pore in middle of Lucaogou Formation shale has a high level of open state, and best rock matrix permeability. Clay minerals can increase the specific surface area obviously; carbonate and feldspar content is inversely pro- portional to specific surface area. Shale reservoir with high content of carbonate or feldspar is given priority to development of centralized distribution and larger pores. Quartz （ including authigenic quartz） can improve the shale properties property through the enhancement of shale brittleness forming micro cracks, and resistance to compaction protecting micro pore. That is more important than the adversely effect caused by the formation of authigenic quartz. Lucaogou Formation shale microscopic geological conditions are conducive to the enrichment and seepage of free shale oil, which is the important reason to build production capacity in the area.
出处
《西北大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第1期88-95,共8页
Journal of Northwest University（Natural Science Edition）
基金
国家自然科学基金资助项目(41272156)
全国油气资源战略选区调查与评价基金资助项目(2009GYXQ150900)
关键词
页岩油
微观孔隙
比表面积与比孔容
自生石英
马朗凹陷
shale oil
micro-pore
specific surface and specific pore volume
authigenic quartz
Malang Sag
