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准确确定致密砂岩油充注孔喉下限有助于正确认识致密油成藏。对四川公山庙油田致密砂岩油充注孔喉下限进行理论推导和实验测试。源储界面致密油充注受生烃增压作用明显,基于流体力学作用间平衡关系和油藏实际参数,理论推导源储界面充注孔喉直径下限为29.06nm;储层内部充注力学机制与源储界面不同,生烃增压对流体充注的直接作用较弱,界面的力学推导过程不适用,而通过对实际砂岩样品进行环境扫描与能谱联测的方法确定储层内部的孔喉直径下限为59.66nm。结合致密砂岩储层压汞分析,应用充注孔喉下限确定源储界面附近的含油饱和度为69.5%;储层内部的含油饱和度为60.4%。含油饱和度预测值与公山庙油田致密砂岩实测含油饱和度相一致,对不同部位的孔喉下限的研究结果可为致密砂岩油分布规律和目标评价提供理论依据和预测方法。
Accurately determining the lower limit of pore throat of tight sandstone oil filling can help to correctly understand the tight oil accumulation. The theoretical deduction and experimental tests on the lower limit of pore filling rate of tight sandstone oil in Gongshanmiao Oilfield in Sichuan Province were carried out. Based on the equilibrium relationship between fluid mechanics and reservoir actual parameters, the lower limit of pore throat diameter of the source-reservoir interface is theoretically deduced to be 29.06 nm. The mechanism of charge filling in the reservoir Unlike the source-reservoir interface, the direct effect of hydrocarbon generation and pressurization on fluid charging is weak, and the mechanical derivation of the interface is not applicable. However, by means of environmental scanning and energy spectrum measurement of actual sandstone samples, the pores in the reservoir are determined The lower throat diameter was 59.66 nm. Combining with the analysis of mercury injection in tight sandstone reservoirs, the oil saturation near the source-reservoir interface is determined to be 69.5% using the lower limit of filling pore throat; and the oil saturation inside the reservoir is 60.4%. The prediction of oil saturation is consistent with the measured oil saturation of tight sandstone in Gongsamiao Oilfield. The results of the study on the lower limit of pore throat in different parts of sandstone can provide theoretical basis and prediction method for the distribution and target evaluation of tight sandstone oil.