Research on the characteristics and sensitivity of the Fuxian formation reservoir in the Wuqi area of Yanchang oilfield
In recent years,a number of low-resistance oil reservoirs within the Fuxian for-mation have been discovered successively in the western region during the development of oilfields.These reservoirs have demonstrated high initial production rates and favorable de-velopment outcomes.To further enhance the development of the Fuxian formation oil reser-voirs in the Wuqi area,it is necessary to understand the basic characteristics of the reservoirs,fill the research gap in reservoir sensitivity,strengthen reservoir protection efforts,and guide subsequent potential adjustments.In this study,rock core displacement,cast thin section identification,high pressure mercury,XRD mineral quantitative analysis and scanning elec-tron microscopy technology were used to characterize and study the reservoir characteristics of the research area from aspects such as lithological characteristics,physical properties,pore throat development characteristics and pore structure characteristics.The results indicate that the main rock types of the Fuxian formation reservoirs are medium-fine-grained lithic felds-pathic sandstone.The porosity ranges from 6.0%～18.0%,with an average of 12.9%,and the main distribution interval is 10.0%～16.0%,accounting for nearly 79.2%of the total.The reservoir permeability ranges from(0.01～62.80)×10-3μm2,with an average of 8.26×10-3μm2,and the main distribution interval is(0.30～80.00)×10-3μm2,accounting for nearly 87.5%of the total,which is classified as a low-porosity and low-permeability reservoir.The reservoir sensitivity analysis suggests strong velocity sensitivity,weak water sensitivity,weak salt sensi-tivity,strong acid sensitivity,and moderate to weak alkali sensitivity.The research findings provide an important basis for the protection of the Fuxian formation reservoirs in the Wuqi area and the formulation of scientific and reasonable oil reservoir development policies.
万方数据
维普
