鄂尔多斯盆地东南部柴上塬区长6油藏类型判识

Identification of Chang 6 reservoir types in Chaishangyuan area in southeastern Ordos Basin

柴上塬区勘探开发程度较高,区内油井普遍见水,油藏内地层水的附存类型的判别对于油田进一步开发具有重要的意义。在充分调研前人研究方法的基础上,进一步总结细化,通过对测井、生产动态、压恢测试等资料的分析,对研究区长6油藏有无边底水的判断进行了全面充分的研究。结果表明:区内各井不存在无水生产期、压恢测试后期未出现下掉、纯水层与含油层并不处于同一套砂体。综合确定,区内长6油藏不存在边底水,无明显的油水界面,为典型的致密砂岩岩性油藏。

The degree of exploration and development in Chaishangyuan area is high,and the oil wells generally produce water in the area.the discrimination of the storage type of water in the inner layer of the reservoir is of great significance for the further development of the oil field.Therefore,on the basis of full investigation of previous research methods,this paper makes a further summary and refinement,and makes a comprehensive and full study on the judgment of boundless bottom water in Chang 6 reservoir in the study area through the analysis of well logging,production performance,pressure recovery test and other data.The results show that there is no anhydrous production period in each well in the area,and there is no drop in the later stage of pressure recovery test,and the pure water layer and the oil-bearing layer are not in the same set of sand bodies.It is comprehensively determined that there is no edge and bottom water and no obvious oil-water interface in Chang 6 reservoir,which is a typical tight sandstone lithologic reservoir.