川西坳陷中段钙屑砂岩储层特征及主控因素

doi:10.3969/j.issn.1673-8926.2012.02.015

Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (2): 77-82.doi: 10.3969/j.issn.1673-8926.2012.02.015

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Characteristics and controlling factors of calcarenaceous sandstone reservoir in the middle part of western Sichuan Basin

LIU Huan¹， PENG Jun¹， LI Lijuan²， LUO Wenjun¹， XIAO Yan¹

1. College of Resources and Environment， Southwest Petroleum University， Chengdu 610500， China； 2. Research Institute of Exploration and Development， Henan Oilfield Company， Sinopec， Nanyang 473132， China

Online:2012-04-20 Published:2012-04-20

Abstract

Abstract:

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.

Key words: depositional sequence, sedimentary model, Paleogene, northern margin ofQaidamBasin

LIU Huan， PENG Jun， LI Lijuan， LUO Wenjun， XIAO Yan. Characteristics and controlling factors of calcarenaceous sandstone reservoir in the middle part of western Sichuan Basin[J].Lithologic Reservoirs, 2012, 24(2): 77-82.

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