Influences of feldspars on the storage and permeability conditions in   tight oil reservoirs: A case study of Chang-6 group, Ordos Basin

CORC > 北京大学 > 地球与空间科学学院

	Influences of feldspars on the storage and permeability conditions in tight oil reservoirs: A case study of Chang-6 group, Ordos Basin
	Xu Lei ; Shi Yongmin ; Xu Changsheng ; Yang Yue ; Li Hong ; Chai Zhi
刊名	石油勘探与开发
	2013
关键词	Ordos Basin Chang-6 oil layer group tight oil feldspar
英文摘要	Based on the results from rock thin section observation, casting thin section identification, high-pressure mercury injection, rate-controlled porosimetry, X-ray diffraction, and high resolution field emission CMOS scanning election microscope observation and analysis, influences of feldspar minerals on the storage and permeability conditions in Chang-6 oil layer group in the Yanchang Formation of the Ordos Basin were studied from crystallography and mineralogy perspectives. Due to the differences of crystal structure and chemical composition, the brittleness and solubility of feldspar minerals vary greatly. The results indicate that basic plagioclase such as anorthite tend to split along the cleavage to form new flow channel in formation conditions. Alkaline feldspar rich in potassium such as orthoclase tend to corrode along the cleavage to form secondary porosity. The brittleness and solubility of acid plagioclase, such as albite, are between anorthite and orthoclase. The dominant pore type in Chang-6 oil layer group of Ordos Basin is residual inter-granular pore, the secondary pores generated by corrosion and fracture of feldspar have little contribution to porosity. In the area with higher content of anorthite, the micro-cracks resulted from breaking in cleavage effectively improve the permeability. The contribution of feldspar minerals to permeability is ranked from great to small as anorthite, orthoclase and albite.; Energy & Fuels; Engineering, Petroleum; Geosciences, Multidisciplinary; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 1; ARTICLE; 4; 481-487; 40
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/155606]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Xu Lei,Shi Yongmin,Xu Changsheng,et al. Influences of feldspars on the storage and permeability conditions in tight oil reservoirs: A case study of Chang-6 group, Ordos Basin[J]. 石油勘探与开发,2013.
APA	Xu Lei,Shi Yongmin,Xu Changsheng,Yang Yue,Li Hong,&Chai Zhi.(2013).Influences of feldspars on the storage and permeability conditions in tight oil reservoirs: A case study of Chang-6 group, Ordos Basin.石油勘探与开发.
MLA	Xu Lei,et al."Influences of feldspars on the storage and permeability conditions in tight oil reservoirs: A case study of Chang-6 group, Ordos Basin".石油勘探与开发 (2013).