Reservoir Prediction And Favorable Area Evaluation Of Nantun Formation In Southern Area Of Beixi

The study area is located in the southwest of Baer depression,Hailar basin,with an area of 450Km2.The northern part of the Baer depression is the most abundant resourc e of the besi sag,and is located in the West Sag of the South bell depression.The suc cess of oil test in the southern part of the western slope of the Bei 39 well depressio n area opened a new prospect for the exploration of lithologic traps in the southweste rn part of the bay.The resulting problem is,what is the formation mechanism of well Bei 39,whether there are similar reservoir forming conditions inside the work area,and how to find and discover more lithologic traps in the work area.Based on the above r easons,this paper makes use of various technical means such as stratigraphic division,c onstruction fine interpretation,reservoir inversion,seismic multi attribute analysis and so on,to make clear the structural features and reservoir distribution characteristics of the area.Lithologic trap identification is carried out in the favorable sedimentary facies zon e with high precision reservoir inversion data,and the distribution of sand body is trac ed in the well area trap identification from single well and single sand layer,and its f avorable oil and gas range is determined.The application of research results in well fr ee areas can identify favorable traps,carry out the implementation and evaluation of lit hologic traps,and provide the preferred well location.Comprehensive research has made the following conclusions and understandings:At first,The south two member of the South Tun formation in the southwest part of the bay is divided into 7 sand group and the southern one,which are divided into 10 sand groups.It is mainly developed in the fan delta front braided channel,fan delta front wedge sand,shore shallow lake sheet sand,and deep lake turbidite sedimentary microfacies.Second,the sandstone thickness of the 1 sand group in the south part of the South Tun formation is 15-35 m and the sand body range is 125km2;the 2 sand group development zone in the south section is concentrated in the north,the sandstone thickness is 20-35 m,the sand body range is 90km2,the sandstone thickness of the 3-4 sand group in the south section is 25-55 m,the sand body is 95km2,the main sandstone thickness of the 5-6 sand group in the south section is 30-75 m,sand body hair is hair.The range of breeding is 7km2..The porosity distribution of the 1-2 sand group in the south two section of the South Tun.Thenformation is "broken",the porosity distribution in the area is 8%-20%,and the porosity variation range of the 3 sand group is 10%-12%,and the change range is not large;the porosity changes of the 4-6 sand groups are larger and the porosity distribution is 12 to 24% in the industrial area,and a porosity hair is developed in the East.Breeding.The porosity distribution of the 1 sand group in the south section is 8%-13%;the porosity development interval of the 2 sand group is 6.5%-8%,the pore development in the industrial area is not very changed;the pore distribution interval of the 3-4 sand group is 6% to 10%,the porosity distribution interval of the 5-6 sand group is 6 to 7 5%,and the porosity is further worse compared with the upper stratum,and the porosity distribution interval of the 7-9 sand group is 2% 7%.It is lower than the upper layer.After all the favorable zone of the 1 sand group in South Tun formation of 4.Bei sou thwest region is located between the bainite 5-35,and the favorable zone of the 6 san d group is located on the strip with relatively developed pores,with an area of 65Km2.