松辽盆地东南隆起区JFD1井上白垩统青山口组一段油页岩品质特征

Quality characteristics of oil shale of the 1st member ofUpper Cretaceous Qingshankou Formation of Well JFD1in southeastern rising area of Songliao Basin

本文以松辽盆地东南隆起区JFD1井为研究基础,通过岩心观察、样品测试等方法对上白垩统青山口组一段油页岩进行评价。研究分析表明:JFD1井青山口组一段共发育4层油页岩,最低含油率为3.5%,较高含油率为9.2%,个别样品含油率高达11%,整体为中-低品质油页岩,单层最大厚度可达7.4 m,累计厚度为20 m,全硫含量范围0.85%~1.93%,平均值为1.18%,属于特低硫-低硫油页岩。油页岩段含油率与小体积质量、灰分、挥发分显示一定的负相关性,与总有机碳含量TOC呈现明显的正相关性,可以作为油页岩评价的替代指标。对青山口组一段的测井曲线分析显示,油页岩段较非油页岩段具有明显的高自然伽马、高电阻率、高声波时差和低密度的特点,可以作为间接识别油页岩的参考手段。

Based on the Well JFD1 in the southeastern uplift area of the Songliao Basin,the authors evaluate the oil shale resources of the Upper Cretaceous Qingshankou Formation(1st member)through core observation and sample testing.Research analysis shows that,there are four oil shale layers in 1st member of Qingshankou Formation,the minimum oil content is 3.5%,the higher oil content is 9.2%,with 11%of individual oil shale sample,which show the oil shale grade comes to medium-low quality.The maximal thickness is 7.4 m,and the cumulative thickness is 20 m.Total sulfur content ranges from 0.85%to 1.93%,with 1.18%in average,which belongs to lower-low sulfur content.Oil content of the oil shale has certain negative correlation with small volume mass,ash,volatile matter,but the positive correlation exists in oil content with TOC.These indicators can be used as a surrogate for oil shale evaluation.The well logging curve characteristics show that the oil shale layers has the obvious characteristics of high natural gamma,high resistivity,high acoustic travel time and low density,which can be used as a reference for indirect identification of oil shale.