气顶底水浊流相油藏剩余油分布研究

Research on Remaining Oil Distribution in Gas and Bottom Water Turbidity-current Reservoir

浊流相油藏中存在气顶和底水时,因其特殊的沉积特点,内部油气水运动变化复杂,开发中后期剩余油分布研究难度较大。以欢17块大凌河油藏为例,应用油藏数值模拟方法,定量研究了气顶底水浊流相油藏开发中后期剩余油分布规律。通过研究,明确了此类油藏地质模型建立过程中的关键点在于隔夹层分布的正确描述。给出典型范例详解了隔夹层分布的修正过程;指出了此类油藏拟合过程中的重要拟合指标综合含水率和产气量的拟合关键点,并分析得出油侵气顶区及构造顶部区是该类油藏剩余油的主要富集区域。最后,基于剩余油数值模拟结果,提出了压水锥和侧钻水平井相结合的开发调整方式,为高效开发此类油藏提供了技术支持和决策依据。

Influenced by the special sedimentary characteristics, the rule of fluid flow in the gas and bottom water turbidity-current reservoir is complicated, which adds more difficulties concerning the research on the law of distribution of remaining oil. On the background of Dalinghe reservoir in block Huanl7. The law of remaining oil distribution of turbidity-current reservoir with the gas cap and bottom water in quantity is researched. Through the study process, the key point of the 3 D geological modeling of this kind of reservoir is truly be understood, which is correctly describing the distribution of the interlayers. Moreover, an example was given to illustrate the process of revision. Then, the critical points of the indices are figured out based on the history match of the reservoir perform- ance. Thus, it is concluded that the rich residual oil zone in this reservoir are the tip region of the formation and the gas-cap zone which invaded by oil. Based on the results of reservoir simulation, the combination of shut-in coning control method and sidetracking horizontal wells measure as the effective development adjustment programs are put forward, which can provide the technique support to develop such reservoirs.