鄂尔多斯盆地延长组第7油层组致密油资源评价

总结了鄂尔多斯盆地延长组第7油层组(简称长7)致密油研究及勘探进展,从砂岩展布、物性特征、致密油充注时间和成藏期次等方面研究长7致密油地质特征,并按特征将致密油划分为A类和B类。在此基础上,采用小面元法和EUR类比法分别计算长7致密油地质资源量和可采资源量。评价结果揭示:长7致密油地质资源量和可采资源量分别为41.78×10~8t和3.73×10~8t,高资源丰度区主要分布在Ning 89井西侧、华池—马岭—环县一带、姬塬和AP11井附近。研究思路和评价结果为中国致密油资源评价及勘探生产提供有益参考。

An assessment of tight oil resource in 7th oil reservoirs of Yanchang Formation,Ordos Basin

This paper summarizes the tight oil research and exploration progress in 7th oil reservoirs of Yanchang Formation(Chang 7), Ordos Basin. Moreover, the tight oil geologic characteristics of Chang 7 have been studied in terms of sandstone distribution, physical characteristics, tight oil charging time and accumulation stage. Accordingly, the tight oil is divided into Type A and Type B. On this basis, the geological resources and recoverable resources of regional tight oil are estimated by the small bin method and the EUR analogous method. The evaluation results show that the tight oil reservoir in Chang 7 has the total geologic resources of 41.78×10⁸t and recoverable resources of 3.73×10⁸t. The areas with high resource abundance are mainly distributed to the west of Well Ning 89, along Huachi-Maling-Huanxian areas, in Jiyuan and adjacent to Well AP11. The research approach and results provide beneficial reference to China’s tight oil resource assessment, exploration and production.