Reservoir characteristics and sensitivity analysis of the Mayaoxian oil region of Miaogou in Wuqi oilfield
The reservoir type in the Mayaoxian oil region of Miao-gou is a low permeability to ultra-low permeability reservoir.The pore type,pore throat structure,and sensitivity of the reservoir ana-lyzed by methods such as casting thin sections,clay X-ray diffrac-tion analysis,and sensitivity testing.The results indicate that the rock types are mainly quartz sandstone and feldspar sandstone,and the pore types are intergranular pores and feldspar dissolution pores.The reservoir has poor physical properties,with"Yan 10"be-ing a low porosity and low permeability reservoir,"Chang 4+5"be-ing a low porosity and ultra-low permeability reservoir,and"Chang 9"being an ultra-low porosity and ultra-low permeability reservoir.Based on neighboring rock core tests,it is found that the"Yan 10"reservoir is moderately strong in water sensitivity,strong in salt sensitivity,strong in acid sensitivity,and weak in alkali sen-sitivity.The"Chang 4+5"reservoir is moderately weak in speed sensitivity,water sensitivity,salt sensitivity,acid sensitivity,and moderate in alkali sensitivity.The"Chang 9"reservoir is moderate-ly weak in speed sensitivity,water sensitivity,salt sensitivity,acid sensitivity,and weak in alkali sensitivity.The"Yan 10"reservoir is strongly acid sensitive,and acidification measures should be carefully selected in the later production and construction process.
NETL
NSTL
万方数据
