Simulation of Remaining Oil in Chang 2 Member in Tiebiancheng Area,Ordos Basin
How to effectively predict the distribution law of remaining oil resources is an important work to increase the oil field production potential of old wells.Taking the Chang 2 Member of the Tiebiancheng area,Jiyuan oilfield,northwestern Ordos Basin as an example,the remaining oil distribution characteristics of the main reservoir were systematically studied using core,thin section,electron microscope,physical properties and numerical simulation methods.The study shows that the Chang 23-21 and Chang 23-31 layers are the main oil-producing formations with average thicknesses of 12.2 m and 11.1 m,respectively.The main oil-producing layers have the porosity range between 12％and 18％and the permeability of less than 8 mD.According to the principle of facies control,the physical property model and fluid model of the main production layers are established.Furthermore,the reservoir numerical simulation was carried out using the ECLIPSE Software.The historical fitting results show that all the production indexes are in good agreement with the actural data,and the simulation results are reliable.The numerical simulation results show that the remaining oil distribution is affected by sand body boundary,physical property difference and injection-production relationship.However,due to the difference of reservoir properties,the effect of water injection is not uniform,resulting in local remaining oil enrichment.The remaining oil is mainly distributed at the boundary of the sand body.There is no well pattern control in these areas,so the degree of water flooding is low and the remaining oil is rich in these areas.As for the areas on both sides of the high permeability zone between injection and production wells,the oil well is flooded quickly and the oil well production decreases rapidly because the injected water breaks out along the high permeability zone between injection and production wells.At the same time,due to the small affected area and uneven water flooding,the areas on both sides of the hyperpermeability zone did not get effective water flooding,forming the remaining oil-rich area.Therefore,the remaining oil accumulation is obviously controlled by microfacies,physical properties,water injection and well pattern factors.
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