Reservoir Evaluation Of Yan 10 Oil Reservoir Group In Yanan Formation Of The Jurassic In Jihuang 32 Block Of Erdos Basin

This thesis starts from the regional geological data,base on the theories of sequence stratigraphy,sedimentology and reservoir geology,use logging data,geological data,the test data of porosity and permeability to comprehensive analyze Ji Huang 32 block Yan 10 oil group of the sequence stratigraphic framework and sedimentary,and then eventual adopt the comprehensive evaluation of the reservoir and the predicted favorable zones,develop a reasonable development plan.This thesis made the following main results and understanding:1.Using marker beds,sedimentary cycles and lithology thickness contrast methods,to do the fine division and correlation of strtigraphic research,Yan 10 oil layers are divided into two sand groups and four sublayers.Among them,the residual stratigraphic thickness of Yan 1011 sublayer is the thinnest,the average thickness of about 5m,the residual stratum of Yan 1021 sublayer is thickness,and is up to 11m.In the area of southern of Feng 14 well area,due to the ancient geomorphological impact the formation of a wider range of denudation area,the stratigraphic residual thickness is 0m.2.Yan 10 oil group of Ji Huang 32 block identified the braided river sedimentary subfacies based on the observed part of the core and mainly on the well log data,and division four kinds of microfacieses:channel bar,channel sand point bar and interchannel.The microfacies channel sand in the plane was north-south to the banded main river of the local area is merged with the bifurcation,then formatted a braided or mesh patterns.In the early Yan 10 oil group,the source is sufficient,river migration frequently,channel bar sedimentary microfiches development;deposition of late,due to the accumulation of river super-compensation,the river gradually narrowed and the channel bar sedimentary microfacies reduced marsh environment and development.3.The characteristics of the reservoir are middle properties,and low permeability,heterogeneity is strong.Insignificant sublayers of the Yan 1022 glutenite sorting less affected by the deposition interface,internal mezzanine development of the sand,leading to heterogeneity of the strongest.4.Combined with the research of sedimentary facies,base on the method of the division of flow units,the research reservoir is divided into four categories,including the widest range of C-class reservoir,distribution in the study area,mostly river bottom sediment micro facies,poor property,and the thickness of the sand body is small,but the contiguous is well.5.On the basis of the above studies,the combination of reservoir formation,the main controlling factors of drilling test oil well logging interpretation,forecasting two blocks of class I,a class II area,which I class area oily total area 1.93Km2,a total of 14.48 × 104t of the control reserves,shows that Yan 10 reservoir group has good potential for development.