油气藏开发阶段储层地质模型的建立及优选方法

Reservoir geological modeling and optimum seeking method in the development phase of the oil and gas field

针对目前国内油气藏开发阶段储层地质建模存在的问题,提出了基于模型概率储量分析及生产历史拟合的模型建立及优选方法。该方法首先综合应用测井、地质、开发动态等研究成果,以相控建模思路为指导,分步建立构造模型、沉积相模型以及沉积相控制下的储层参数模型。重点分析了影响储层地质建模的不确定因素,并采用蒙特卡罗模拟对随机变量进行取值,得到多个模型实现并对其进行储量计算,优选一系列地质模型。最后对所优选的模型进行生产历史拟合,通过区块累产气量与实际生产数据的均方根误差分析,选取与实际生产数据最为符合的模型作为最终的模型。通过对榆林气田陕215井区北部山西组2段的地质模型的建立及评价可知,该方法适合油气藏开发阶段的地质模型重建,输出模型能更好地反映油气藏实际并能较好的应用于油气藏数值模拟。

Aiming at the problems of reservoir geological modeling in the development phase of the domestic oil and gas field,proposed optimum seeking method of geological models based on probabilistic reserves analysis and production history matching is put forward.First,the structural model,the sedimentary facies model and the property model are established step by step using facies-controlled modeling technology on the basis of study results on logging,geology and development performance.Then the uncertainties in facies modeling and property modeling are focused on,and a series of optimum models are obtained by the responding gas reserves calculated of the reservoir using the Monte Carlo simulation random sampling the uncertainties.Finally,the production history between optimized models and actual production data is matched.Based on the analysis of the root mean square error between cumulative gas production of the whole unit and the actual production data,the final model which has the minimum error is selected.Through the establishment and evaluation of the geological model in the second member of Shanxi formation in the north of block Shan215 of Yulin gas field,the method is suitable for the geological model reconstruction in the development phase of the oil and gas field.The output model can better reflect the actual characteristics of oil and gas reservoirs and can better be used for petroleum reservoir simulation.