Study on shallow reservoir characteristics of Yan'an Formation and its application in reservoir favorable area evaluation
Ansai Oilfield is a typical oil and gas enrichment zone in the Ordos Basin,which Yan'an Forma-tion reservoir has shallow burial depth with low recovery degree and inefficient production.Combined with logging data and core analysis,the characteristics of shallow reservoirs in Yan'an Formation were analyzed and described,and the research on reservoir characteristics was improved,thus favorable area evaluation was carried out.The results show that the distributary channel is a favorable reservoir facies of the Yan'an Formation,and the porosity of the reservoir in the Yan'an Formation is mainly distributed in the range of 14%-18%,and the permeability is about 10.0 mD.Owing to the joint action of sedimentary environ-ment,diagenesis and reservoir physical properties,the distribution of oil and water in the Yan'an Formation is complex.Structural movement and sedimentary facies jointly control the spatial distribution of the sand body,which provides reasonable suggestions for the exploration and production of shallow Yan'an Formation reservoirs.
Ansai OilfieldYan'an Formationreservoir evaluationfavorable area
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