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气侵分馏作用是油气藏后期调整改造的重要营力之一.在塔中地区气侵分馏作用的发生有其得天独厚的石油地质条件,但现有的研究只停留于对气侵作用过程的定性描述阶段.在前人的研究基础上,利用全油正构烷烃绝对定量以及正常油/凝析油混合配比实验的结果,对该区气侵分馏作用进行定量评估,讨论了造成气侵强弱的地质因素,并分析了可能伴随气侵作用而发生的其他分馏作用对油藏的影响.该区气侵作用特征表明大量断裂体系是控制气侵作用强弱的主要因素,气侵作用的强弱分布规律也为该区断裂体系发育及其开启闭合特征的研究提供了有利的佐证.气侵分馏作用的强弱以及伴随发生的PVT分馏作用与该区原油类型多样性存在直接的成因关系,该区存在的与凝析油伴生的蜡质原油是气侵作用、PVT分馏以及混合作用共同造成的结果.
Gas-infiltration and fractionation are one of the important forces in the later period of oil and gas reservoir adjustment and adjustment.In the Tazhong area, the occurrence of gas-intrusion and fractionation has its unique petroleum geological conditions, but the existing research only stays in the qualitative analysis of the gas-intrusion process Based on the previous studies, based on the results of the absolute quantification of n-alkanes and the mixture ratio of normal oil / condensate, the gas-intrusion fractionation in this area was quantitatively evaluated. Weak geological factors and analyzed the influence of other fractionation actions that may occur along with gas invasion on the reservoir.The characteristics of gas invasion in this area indicate that a large number of faults are the main factors that control the intensity of gas invasion, The distribution of strength and weakness also provide favorable evidence for the study on the development of fracture system and its opening and closing features in this area. The strength of gas-intrusion fractionation and the accompanying fractionation of PVT have a direct genetic relationship with the type of crude oil in this area The waxy crude oil associated with condensate in this area is the result of gas intrusion, PVT fractionation and mixing.