断陷湖盆水下扇岩性油藏评价方法研究

THE EVALUATION METHOD OF LACUSTRINE SUBAQUEOUS FAN LITHOLOGIC RESERVOIR IN RIFT BASIN

水下扇岩性油气藏为近年我国中东部断陷湖盆岩性油藏新增储量主要代表类型之一,该类油藏受控于水下扇体的展布范围,具有范围窄、横向变化快、非均质强等特点。以二连盆地木日格水下扇岩性油藏为具体研究实例,探讨该类油藏从控制储量到探明储量勘探过程中,油藏评价研究的思路、方法等主要内容,为该类油藏合理、准确落实储量规模,降低评价勘探风险,提出了针对性措施。研究表明,对于水下扇岩性油藏评价,重点在于评价其岩性油藏参数变化,对于油层有效厚度、孔隙度、饱和度等关键参数,必须采取动态评价的思路,在动态储层预测研究基础上,对各参数进行动态评价。对二连盆地木日格水下扇油藏采取上述思路和方法,已取得良好效果。

The lacustrine subaqueous fan lithologic reservoirs are the main new type of the reserve volume growth in rift basis in Middle and East China,the distribution is controlled by the extention of lacustrine subaqueous fans.The typical characteristics of the lacustrine subaqueous fan lithologic reservoirs are narrow extention,quick horizontal change and strong inhomogeneity.Murige lacustrine subaqueous fan lithologic reservoir in Erlian Basin in China is taken as example to discuss the reservoir evaluation thought,method and main content from the estimated reserves to proven reserves,present some measures in view of verifying the reserve volume accurately and reasonably,and decrease the risk of evaluation exploration.The study shows that the key of lacustrine subaqueous fan lithologic reservoir evaluation is the change of the reservoir characteristics,dynamical evaluation of the main characteristics of lacustrine subaqueous fan lithological reservoir must be done,such as net pay thickness,porosity and saturation etc.,on the basis of dynamic reservoir prediction.By the above-lmentioned reservoir evaluation thought and method,good application effectiveness in the Murige lacustrine subaqueous fan lithological reservoir in Erlian Basin is acquired.