孤东油田沙河街组水淹层测井评价方法与应用效果

Assessment method and its applications of well logs for water-flooded zones in Shahejie Group of Gudong Oilfield

中国地质大学物探系,北京100083

Department of Geophysic, China University of Geosciences, Beijing 100083

首先,基于孤东油田沙河街组水淹层测井资料和岩心物性分析资料,建立了本区水淹层孔隙度、渗透率、原始含油饱和度等储层参数测井解释模型;其次,利用水分析资料和自然电位测井(SP)资料,建立了本区混合地层水电阻率与SP、泥浆电阻率和泥质含量的关系;综合利用遗传约束优化方法,建立了考虑水淹影响因素的剩余油饱和度测井解释模型。然后,讨论了储层与油层识别问题。

Firstly, a well log interpretation model that concerns reservoir attributes such as porosity, permeability, and initial oil saturation is created according to well logs and core petrophysical data from water flooded zones in Shahejie Group of Gudong Oilfield. Secondly, the relation between resistivity of formation water, spontaneous potential(SP), mud resistivity, and shale content is characterized by water analysis and SP data. Thirdly, with a genetically constrained optimization method, the interpretation model that accounts for water flooding is set up for remaining oil saturation. The discrimination for reservoir and oil layer is also discussed. Finally, the well logs from about 200 wells in the area are processed and interpreted using the above methods. The results from processing and interpretation are in good agreement with the previous findings. Thus it can be seen that these methods can be effectively used in the area.