基于密集取心井构型分析及砂体匹配模式控剩余油模拟

Daqing oilfield decreased year by year, at present, Changyuan has entered the main layer after polymer flooding and chemical flooding depth precision tapping stage. Remaining oil of configuration and distribution is mainly controlled by the reservoir 3-D architecture, the well network and the different types of spatial influence features. The infusion of fine analysis of reservoir architecture model, the establishment of the well sand-body’s configuration mode, reveal the different time different injection agent spatial distribution characteristics and spatial influence of remaining oil after polymer flooding, especiallychemical displacement stage, how the distribution of remaining oil in space, how to optimize well pattern, different wells not homogeneous mode of chemical displacement effect, is an urgent task at present in the Daqing oilfield.Choose intensive coring block, sand body architecture fine characterization, reveal the typical sand-body architecture mode, configuration constructed between wells sand-body matching model based on the water flooding, polymer flooding and chemical physical simulation and numerical simulation of the whole process of flooding, analysis of the various stages of injection agent space influence characteristics and residual oil distribution and the formation mechanism of the formation and distribution of remaining oil, which reveals the development process, to provide scientific guidance and technical support for the potential geological decision of oilfield in each stage.

大庆油田的产能逐年递减，目前长垣主力层皆已进入到聚驱后乃至三元化学驱深度精准挖潜阶段。剩余油的形成与分布主要受控于地下储层的空间构型、注采井网及不同类型注入剂空间波及特征。精细分析储层构型模式，建立井间砂体匹配关系，系统揭示不同时间段不同注入剂空间波及特征及剩余油空间分布特征，特别是聚驱后化学驱阶段，剩余油空间如何分布，怎样优化井网，不同井网不同构型模式下化学驱效果如何，是目前大庆油田所面临的迫切课题。选择密集取心井区块，进行砂体构型精细表征，揭示典型砂体构型模式，建立基于构型井间砂体匹配模式，进行从水驱、聚驱及化学驱全过程物理模拟及数值模拟，分析各阶段注入剂空间波及特征及剩余油形成与分布特征，进而揭示开发过程中剩余油形成与分布机理，为油田在各阶段的挖潜决策提供科学地质导向及技术支撑。

本次研究对典型砂体构型及注采井网匹配方式进行分析，从单砂体构型下的井间匹配模式到复合砂体构型下的井间匹配模式进行逐级次分析，并在井间构型匹配模式下开展驱油物理模拟实验，完成了注采井间单层二维砂体匹配驱油实验、注采井间多层垂向并联驱油物理模拟、单层岩心井网（五点法）砂体匹配模型、特殊井网井间砂体及其构型匹配方式驱油物理模拟等多组实验，明确了不同砂体构型控制下驱油特征，并以实际研究区为例，开展基于井间砂体及其构型匹配方式建模及数值模拟研究，确定了基于储层构型井间注采特征及剩余油分布特征，进而揭示开发过程中剩余油形成与分布机理，为油田在各阶段的挖潜决策提供科学地质导向及技术支撑。