Reservoir Heterogeneity And Classification Evaluation Analysis Of Pu ? Oil Layer Group In Gu693-Ao18 Well Block Of Southern Gulong Area

At present,the reservoir heterogeneity and reservoir performance in the study area(Gu693 well block,Mao15-1 well block,Da146 well block and Ao18 well block)are not well understood,so it is difficult to carry out further oil and gas fine development in the study area.Therefore,under the guidance of well logging geology,reservoir geology and development geology,this paper comprehensively uses various exploration and development data,through the interpretation and analysis of well logging data,core data and mercury injection data,to study the reservoir heterogeneity of Pu I reservoir group in the study area.On the basis of the above research,the fuzzy comprehensive evaluation method is used to evaluate the reservoir classification.The results show that:(1)The pore structure of the whole reservoir in Putaohua reservoir is poor,and the pore structure of the reservoir along the source direction tends to deteriorate.(2)There are two kinds of heterogeneity in the reservoir,positive rhythm and negative rhythm.Along the direction of provenance,the heterogeneity is gradually enhanced,and Da146 well block has the strongest heterogeneity due to the influence of dual provenance.(3)The heterogeneity between reservoirs in Gu693 well block is the strongest,that in Ao18 well block is the weakest,and that in the remaining well block is between them.Along the direction of material source,the distribution of compartment is more and more stable.(4)Along the direction of provenance,the drilling ratio of sand body decreases gradually,and the distribution rule of porosity and permeability in each well area is basically the same.The high porosity and high permeability area is mainly developed in the center of river channel.(5)The reservoir in the study area can be divided into I,II and III types,each of which accounts for about 1 / 3 of the total.In mao15-1 well block,type I reservoir accounts for the largest proportion,which is 39.1%.In ao18 well block,type I reservoir accounts for the smallest proportion,which is only 13.1%.The main reservoirs are pi1-2 and PI3,mao15-1 well block is better,gu693 well block and da146 well block are the second,ao18 well block is the worst,the closer the reservoir is to the source,the better the reservoir performance.