A Study On The Main Controlling Factors Of The Density Of Chang 7 Reservoir Of LuoHe Oilfield

Ordos basin Chang 7 reservoir of LuoHe oilfield is low porosity,especially low permeability reservoir,average porosity is 6.8%,permeability is 0.7 mD.According to datas,oil production of single vertical well in well 1 district is low(0.05 t/d),effects of drilling horizontal well are better,oil production is higher(1.24 t/d),and the current water cut is 78%.Oil production is obviously different between the different single wells,the relationship between capacity and sandstone and drill encounter rate,is not obvious,which has obvious heterogeneity,reservoir geological characteristics,reservoir distribution,high yield and main control factors are all not clear.According to present development situation and existing problems of oilfield reservoir of Chang 7 above LuoHe,this paper takes Chang 7 reservoir in LuoHe well 1 district as the key research object.By using drilling,logging,coring,well logging,testing and other data and applying the of fine reservoir description techniques,on the basis of fine stratigraphic correlation and classification,this paper identifies sedimentary system types in the area,the geological structure,sedimentary microfacies and sand body connectivity,reservoir characteristics,formation water qualitative research;On the analysis of the existing development of LuoHe well 1 district and combining static geological data,we study the prolific producer of oil and gas geological characteristics.Combining the static and dynamic data,the paper study the main controlling factors of the reservoir,the sedimentary microfacies,sand body distribution,reservoir petrology,pore structure and physical characteristics,which is the foundation of the prediction of favorable area and the deciding of the scheme of development.