阿尔及利亚扎尔则油田泥盆系F2层段沉积微相及其分布特征

Sedimentary Microfacies Characteristics and Distribution in Lower Devonian F2 Unit,Zarzaitine Oilfield,Algeria

阿尔及利亚扎尔则油田泥盆系F2层段是挖掘潜力最大的非主力含油层系,研究其沉积微相特征及其分布规律,对缓解开发后期面临的稳产问题具有重要的意义。本文在分析岩心数据和测井二次解释数据的基础上,对F2层段进行精细描述,识别出F2层段主要发育三角洲前缘亚相和浊积扇沉积亚相,包括水下分支河道、河口坝、远砂坝、前缘席状砂、浊积水道、浊积席状砂和浅海-半深海泥质等沉积微相。研究认为F2层段开发挖潜的主要目标为分布较好的浊积水道和水下分支河道。此研究不仅有助于该层精细油藏三维地质模型的建立,同时也为对扎尔则油田剩余油分布规律认识和挖潜提供了可靠依据。

The Lower Devonian F2 unit,in the Zarzaitine Oilfield,is considered as the most significant potential oil bearing strata in Algeria. Researching on the sedimentary microfacies and distribution of the F2 unit is vital to relieve the stable oil yield problem during the late development stage. Combining the cores with the logging data,it is the first time to implement the fine reservoir description on the F2 unit. Moreover,the delta front subfacies and turbidite fan subfacies have been identified in the F2 unit,including 8 sedimentary microfacies： submerged distributary channel,mouth bar,distal bar,frontal sheet sand,submerged distributary channel,turbidite sheet sand and shallow-semi-deep muddy sediment. It shows that submerged distributary channel and distributary channel are the favorable development targets. Therefore,this research benefits in 3D geological modeling building,and provides a reliable evidence on residual oil distribution and development in the Zarzaitine Oilfield.