Characteristics and controlling factors of calcarenaceous sandstone reservoir in the middle part of western Sichuan Basin
Online published: 2012-04-20
The calcarenaceous sandstone in Fenggu-Hexingchang area is typical tight sandstone reservoir. In order to find out the reasons, this paper studied the reservoir characteristics and the influencing factors of physical properties based on analyses of cores, slice and test data. The result shows that the calcarenaceous sandstone reservoir has high contents of carbonate debris, with medium-well sorting, medium psephicity, point-line contact forms and pore-contact cementation among rock grains. The calcarenaceous sandstone reservoir belongs to the lowporosity and lowpermeability reservoirs, and secondary pores are the main reservoir spaces. The reservoir properties are affected by deposition and diagenesis. The deposition dominated the reservoir properties on the macro and underwater distributary channel is the main favorable microfacie. Furthermore，the strong compaction and cementation are the main factors resulting in the low porosity and low permeability of the reservoir, while kaolinite is the main clay mineral，which has constructive effect on keeping the pore space of reservoir. The dissolution is the main factor improving the reservoir properties.
SUN Guoqiang , DU Zhongming , JIA Yanyan , ZHOU Fei , HAO Xiaomei , SHI Ji’an . Characteristics and controlling factors of calcarenaceous sandstone reservoir in the middle part of western Sichuan Basin[J]. Lithologic Reservoirs, 2012 , 24(2) : 77 -82 . DOI: 10.3969/j.issn.1673-8926.2012.02.015
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