Analysis of the characteristics and influencing factors of the Yan 10 reservoir in the western region of Huanxian,Ordos Basin
In order to study the characteristics of Yan 10 reservoir in the western region of Huanxian,Ordos Basin,a systematic study was conducted through experimental analysis methods such as casting thin sec-tions,scanning electron microscopy,and mercury pressure analysis.The results show that the main rock types of the Yan10 reservoir in the study area are feldspar lithic sandstone and lithic sandstone,and the in-terstitial material is mainly composed of clay mineral cement and siliceous cement.The porosity ranges from 5.02%to 19.07%,and the permeability ranges from 0.15×10-3μm2 to 1 176.80×10-3 μm2,which be-longs to the conventional clastic rock reservoir with medium low porosity and medium low permeability.The main types of reservoir space are intergranular,feldspar dissolution and intergranular pores,and the pore structure is mainly of type I and II.Braided river sedimentary system is mainly developed in the study area.The physical property in the middle main river channel and the intersection of main river channel is the best,and favorable reservoirs are mainly distributed in the central beach sedimentary micro-facies area.The physical property is affected by sedimentation and Diagenesis and other factors.The strong compaction in the region and the formation of clay mineral cement,siliceous cement and carbonate cement are the main reasons for the decrease of reservoir porosity,while the formation of Chlorite group film and the dissolution of feldspar and rock debris are conducive to improving reservoir physical conditions.The reservoirs in the Yan10 member of the study area have reached the middle diagenetic stage A stage.
万方数据
维普
