Reservoir Classification and Evaluation Method Based on Storage-permeate and Degree of Heterogeneity

摘要

La-Sa-Xing oilfield is the maximum continental multi-layered sandstone reservoir in China,which has already entered the ultra-high water-cut development stage.Three major contradictions are more prominent and residual oil is highly scattered,the traditional qualitative reservoir evaluation method is hard to meet the demand of current reservoir production and development.According to the requirement of production situation and technology development at ultra-high water-cut stage,combining fine reservoir geological characteristics and development efficiency,a new reservoir evaluation method is established by using multi-parameter product method,multi-parameter bound analysis,etc.The method proposed is set up with storage-permeate assessment parameter and dominant sand-body distribution degree as assessment parameters.It establishes the relationship between static geology and dynamic production and reveals a certain oil-layer potential.The introduction of dominant sand-body distribution degree emphasizes the reservoir plane heterogeneous characters,it can quantitatively characterize the matching relationship between reservoir and well pattern;the reservoir classification based on the above two aspects providing reliable basis for designing water flood,polymer flood and ASP flood development plan.