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储层非均质性研究是油藏精细描述中的重要内容,也是目前油气储层评价方面一个研究难度大且重要的课题。一般试井技术动态结合历史拟合方法只能求得单井附近一定范围内的平均有效渗透率,并不能描述井网或区块的油藏参数区域性非均质分布特点。针对长庆A油田长8低渗透储层渗透率非均质性问题,通过渗流理论与现代试井解释方法结合,利用试井测试和测井资料建立低渗透油藏压裂井试井解释数值模型。通过调整渗透率等主要物性参数的分布,在单井基础上,以井组为对象建立井组数值模型,进行井组数值模型的修正及数值模型可靠性验证和应用,结合生产历史,开展试井精细解释,进而反演出井筒、储层物性等参数。综合数值试井解释结果,可对井组范围内的储层非均质性特征、渗透率分布特征、地层压力分布特征等规律进行评价,为油藏精细描述提供参考。
Research on reservoir heterogeneity is an important part in the detailed description of reservoirs and a difficult and important topic in current oil and gas reservoir evaluation. The general well testing technique combined with historical fitting method can only obtain the average effective permeability within a certain range near single well and can not describe the regional heterogeneity of reservoir parameters of well pattern or block. Aiming at the heterogeneity of permeability of Chang 8 oil reservoir in Changqing A, combining the seepage theory and modern well test interpretation method, well test interpretation and well logging data are used to establish the well test interpretation values of low permeability reservoirs model. By adjusting the distribution of the main physical parameters such as permeability and so on, on the basis of a single well, a well group numerical model is established to revise the well group numerical model and verify the numerical model reliability. Based on the production history, Well-interpreted, and then inverted wellbore, reservoir properties and other parameters. Based on the results of numerical well test interpretation, we can evaluate the reservoir heterogeneity, permeability distribution and formation pressure distribution in the well group, and provide a reference for the fine reservoir description.