摘要
通过野外实测剖面,运用岩石学、地球化学、岩石物理学等手段,探讨了四川盆地西南雷波地区上奥陶统-下志留统五峰组-龙马溪组页岩的储层特征。研究结果表明:(1)五峰组-龙马溪组下段由黑色(富有机质)泥/页岩、粉砂质泥/页岩、泥质粉砂岩、钙化含放射虫微晶灰岩结核、白云质泥/页岩、钙质泥/页岩6种岩相组成。(2)雷波剖面TOC质量分数(wTOC)平均值为3.81%,有机质类型为Ⅰ型和Ⅱ1型,Ro平均值为2.16%,有机质演化程度高,有利于页岩气的生成,黑色页岩有效厚度约为60m。(3)泥/页岩中脆性矿物含量高,五峰组-龙马溪组下段wTOC>2%的岩层以石英和黏土含量居多,五峰组上段和龙马溪组上段wTOC<2%的岩层碳酸盐岩和黏土含量高。石英有2种来源:陆源粉砂碎屑和生物成因。(4)泥页岩微观孔隙主要可以分为4大类型:微裂缝、有机质孔、粒间孔和粒内孔。(5)wTOC与石英、碳酸盐岩呈正相关关系,与黏土呈负相关关系;wTOC、石英含量对于比表面积起主要的控制作用。
By the profiles gotten in the field work and using the methods of petrology, geochemistry, and petrophysics, this paper studies the reservoir characteristics of Wufeng Formation-Longmaxi Formation in the southwest of Sichuan Basin. The results are as follows. O The lower member of Wufeng Formation-Longmaxi Formation in the Leibo area is composed of black mudstone/shale （rich organic matter）, silty mudstone/shale, argillaceous siltstone, calcified mierite concretion containing radiolarian, dolomite mudstone/shale and calcareous mudstone/shale. @The TOC average content of the profiles is 3.81~//00. The type of organic matter is Type I and Type 1][ 1. The average value of Ro is 2.16%, and the evolution degree of organic matter is high. This benefits the generation of shale gas. The effective thickness of the black shale is about 60 m. @The brittle mineral content is high in the mudstone/shale. The TOC of the lower member of Wufeng Formation-Longma Formation is ~2~, and the content of quartz and clay is in the majority in the formation. The TOC of the upper member of Wufeng Formation-Longmaxi Formation is ~2%, and the content of carbonatite and clay is in the majority in the formation. The quartz has two sources, that is, terrigenous silt clastic and biogenic silica. @The micropores of the mudstone/shale can be divided into four types, that is, microfracture, organic matter pore, intergranular pore and intragranular pore. @ By analysing the relationship between the specific surface area, TOC and mineral composition, it is found that the TOC value in the Leibo profile shows negative correlation with the content of clay and positive correlation with the content of quartz and carbonatite. The main controlling factors of the specific surface area are TOC and quartz content.
出处
《成都理工大学学报（自然科学版）》
CAS
CSCD
北大核心
2013年第5期521-531,共11页
Journal of Chengdu University of Technology: Science & Technology Edition
基金
国土资源部油气专项(2009GYXQ15-06)
国家重点基础研究发展计划"973"项目(2012CB214805)
关键词
五峰组-龙马溪组
储层特征
岩相
TOC
矿物
比表面积
四川盆地
Wufeng Formation
Longmaxi Formation
reservoir characteristics
lithofacies~ TOC
mineral
specific surface area
