南襄盆地泌阳凹陷高成熟开发区隐蔽油藏识别技术

Identification of subtle reservoirs in highly-mature development area of the Biyang Depression,the Nanxiang Basin

南襄盆地泌阳凹陷经过三十多年的勘探开发,已处于高成熟勘探阶段,各油田处于高含水开发后期。在分析隐蔽油藏形成的地质基础上,指出隐蔽油藏与较大规模油藏的形成是同源同步的。充分利用高成熟开发区动、静态资料丰富的优势,提出识别隐蔽油藏的3种技术方法:小层精细对比技术、圈闭评价技术、微构造分析技术。利用这些方法对南襄盆地稀油老区的隐蔽油藏进行了有效识别,成功率在90%以上。新增石油地质储量超过500×104t,年增原油超过1×104t,取得了明显的应用效果。

After more than 30 years of exploration and development, the Biyang depression has been highly mature in exploration and development, with most of the fields entering the late stage of development with high water cut. Analysis of the geological conditions for the formation of subtle reservoirs indicates that they share the same source and happened in the same period with larger-scale reservoirs. Three methods for identifying subtle reservoirs are presented here based on the abundant dynamic and static data available. They are fine correlation of subzone,trap assessment, and micro-structure analysis. Proper use of these methods can effectively identify subtle light oil reservoirs in the matured areas in Nanxiang basin. The results show a success rate of identification over 90 % and increamental geologic reserves of more than 5 million tons and annual crude production growth of more than 10 000 tons.