对川北西部地区千佛崖组非常规储集层综合分级的探讨

AN APPROACH TO THE COMPREHENSIVE GRADING OF UVCONVENTIONAL RESERVOIR OF QIAN FOYAN FORMATION IN WESTERN PART OF NORTH SICHUAN

王当奇

Wang Danghi

地矿部西南石油地质局综合研究大队

Southwest China Bureau of Petroleum Geology, Ministry of Geology and Mineral Resources

川北西部地区千佛崖组是较重要的复杂的非常规含油气组.该区含油气层达数十层之多,累积厚度近百米。部分井层测试资料表明,一些井层获得了可喜的工业性油流;另一些井层则为低产层,甚至是干层。值得注意的是:在构造位置相同,生、储、盖配置条件相当的情况下,高产能层位的砂岩基质孔隙度与微孔结构差于低产能层位,甚至差于只有显示或干层层位的砂岩基质孔隙度,充分显示了千佛崖组砂岩储集层的非常规性。判断千佛崖组非常规储集层优劣的标准,直接影响到能否较准确的选择试油层位及取得最大的经济效益。本文立足于17口完钻井地质资料和各项实验分析数据、测井和测试资料及其相关性研究的基础上,试图对这一问题进行论述。

The sandstone of Qianfoyan Formation is tight and poor in micropore-geometry, but commercial oil were found in coarse calcareous shelly quart-zose siltstone. The reason for the storing of oil in Qianfoyan Formation is that the tight sandstone contains multiple layer of unhomogeneous resevoir interlinked by high angular fissures, which control the accumulation and production of oil and gas. Based on the features of the comprehensive logging curves, qualitative discrimination and grading are made.

https://doi.org/10.11781/sysydz198504303