河流相储层不连续界限对剩余油分布及布井策略的影响作用

河流相储层内部夹杂着诸多影响地层渗流的不连续界限,研究其对剩余油分布的影响,优化布井策略,对此类油藏高效开发具有重要意义。结合复合砂体构型理论成果,建立了不同级别不连续界限的油藏数值模拟模型,模拟了在大井距开发条件下,不连续界限对剩余油分布的影响,建立了河流相储集层不连续界限控制的剩余油分布规律图版;根据不连续界限两侧砂体叠置关系,将河流相不连续界限归纳为3种接触模式,基于界限规模和连通能力认识,结合界限控制的剩余油分布,提出了水平井穿不连续界限的布井策略。选取渤海某河流相油田进行了成果应用,根据示踪剂产出分析结果和新钻调整井生产效果认为,本文研究具有较好地适用性,对油藏开发方案设计井位部署和剩余油挖潜具有指导作用。

Impact on remaining oil distribution and well spacing pattern of discontinuous boundary in fluvial reservoir

There are many discontinuous boundaries in fluvial reservoir,which affect the formation seepage.It is of great significance to study their influence on the distribution of remaining oil and optimize the well spacing pattern for the efficient development of such reservoirs.Combined with the theoretical results of composite sand body configuration,the numerical simulation models of reservoirs with different levels of discontinuous boundaries are established,the influence of discontinuous boundary on remaining oil distribution under the condition of large well spacing development is simulated,and the remaining oil distribution chart controlled by discontinuous boundary of fluvial reservoir is established.According to the superposition relationship between sand bodies on both sides of the discontinuous boundary,the discontinuous boundary of fluvial facies can be divided into three contact modes.Based on the understanding of boundary scale and connectivity,combined with the remaining oil distribution controlled by boundary,the well spacing pattern of horizontal well crossing discontinuous boundary is proposed.The research results are applied to a fluvial facies oilfield in Bohai Sea.According to the analysis results of tracer production and the production effect of newly drilled adjustment wells,it is considered that the research in this paper has good applicability,and has a guiding role in the design of well location deployment and the potential exploitation of remaining oil in reservoir development plan.