利用ECS测井资料评价复杂岩性储层渗透率

Permeability Evaluation of Complex Lithology Reservoir Using ECS Log Data

复杂岩性储层岩石成分复杂,孔隙结构变化大,岩心孔隙度渗透率相关关系差,难以准确确定核磁共振测井资料处理中必需的T2截止值,致使渗透率计算面临极大挑战。基于Lambda渗透率模型,利用地层元素能谱测井(ECS)得到的矿物成分与骨架密度等数据评价复杂岩性储层渗透率,克服了利用岩心孔隙度渗透率关系和核磁共振测井评价复杂岩性储层渗透率的困难。通过该方法对渤海地区部分井资料处理发现,Lambda渗透率模型得到的渗透率与岩心分析渗透率基本一致,证实了该方法的实用性,为复杂岩性储层渗透率评价提供了一种有效手段。

Permeability is a key parameter to evaluate reservoir percolation ability.Porositypermeability relationship from cores or NMR logging is a common method.Because of complex composition in rock and great change of pore strcuctures,complex lithology reservoir porositypermeability relationship from cores is poor,and is difficult to accurately determine T2cut-off in NMR logging data,so it is difficult to calculate permeability.Based on Lambda model from Johnson,ECS logging is used to calculate mineral composition and metrix density,and then to evaluate permeability of complex lithology reservoir so as overcomes the disadvantages of cores and NMR.With this method for Bohai areas data processing,it is found that the permeability from Lambda model has a good consistency with cores permeability,further confirms the usefulness of this method,and provides an effective method for complex lithology reservoir permeability evaluation.