Quantitative prediction of the oil-bearing height of Tertiary stratigraphic reservoirs in Jiyang Depression

Abstract

Abstract The Tertiary stratigraphic reservoirs in Jiyang Depression are characterized by small buried-depth, long distance of trap from source, low oil-bearing height and poor oil physical property. Oil-bearing height is mainly determined by four factors: expulsion rate of source rock, migration distance, dip angle of carrier bed and capillary resistance force. Of these four factors, the expulsion rate can be expressed by the pressure factor gradient of source rock, the migration distance can be expressed by the horizontal and vertical distances between trap and source, and the capillary resistance force in carrier beds can be expressed by the capillary pressure in trap reservoirs. From the statistics of 62 stratigraphic reservoirs, oil-bearing height is in positive correlation with pressure factor gradient and dip angle of carrier bed and in negative correlation with horizontal and vertical distances between trap and source and capillary resistance force. On the basis of relations analysis between oil-bearing height and single factors, the multi-parameter match expression for the stratigraphic reservoir oil-bearing height has been established through multiple regressions. The application results show that the predicted value from match expression matches well with the true value. The expression can be used for the prediction of oil-bearing height of Tertiary stratigraphic reservoirs in Jiyang Depression.