强非均质时变性裂缝性油藏数值模拟研究

Study on numerical simulation of fractured reservoir with strong heterogeneity and time variant

火烧山油田H3油组为一典型的强非均质裂缝性油藏,储层中裂缝非常发育,其裂缝系统呈"米"字形,无明显主方向。地层中既有大裂缝、中裂缝,又有微隐裂缝,且有较明显的区域性。在长期的开发过程中,由于频繁实施压裂、堵水等措施,储集层物性参数不断发生变化,一般的模型难以模拟这类油藏。基于这些特点,为准确高效模拟该类油藏,采用双重介质特征参数分区分阶段数值模拟方法,考虑了裂缝的影响、不同规模裂缝的区域性分布和开发过程中储层物性参数的变化,对火烧山油田H3油组进行了开发中后期精细数值模拟研究,分析了剩余油分布规律。以上方法能够更快地实现历史拟合,模拟结果符合开发实际,对油田实际开发有很好的指导作用,同时为其他该类油藏的模拟研究提供了参考。

Oil Group H3 of Huoshaoshan Oilfield belongs to the typical fractured reservoir with strong heterogeneity,in which fractures are well developed.The fracture system of reservoir shapes like character-meter and has no apparent main direction.Large-scaled,medium-sized and small-sized fractures can be detected all over the formations with obvious distributing regionally.During the long-term exploitation,the parameters of reservoir physical property vary continuously as a result of frequent use of hydraulic fracturing,water plugging and other stimulating measures.This kind of reservoir can′t be simulated by general model.Based on these features,the method of building zoned and staged numerical model for special parameters of dual-porosity medium is used to simulate this kind of reservoir effectively.Production of Oil Group H3 of Huoshaoshan Oilfield is fine simulated by use of this method,which takes the regional distribution of different fractures,influence factors of fracture and variable formation parameters into consideration,and the remaining oil distribution law of reservoir is analyzed.This method can speed up the history matching and the modeling results more fit in with the development performance,which can provide a guiding for field production and a reference for similar reservoir simulation.