新疆大长沟盆地下侏罗统八道湾组油页岩测井识别

Well Logging Identification of Lower Jurassic Badaowan Formation Oil Shale in Dachanggou Basin,Xinjiang

大长沟盆地石碳窑北下侏罗统八道湾组油页岩含矿区位于新疆巴里坤县长虫梁地区,是我国目前正在开发的优质油页岩矿床。本次在岩心观察和测试分析的基础上,运用测井模型开展油页岩评价,为本区油页岩资源评价提供依据。研究表明油页岩TOC与密度、电阻率和自然伽马测井曲线存在线性相关,通过测井曲线预测TOC,进而根据TOC与含油率的线性关系,计算含油率;本次优选ZK1601钻井密度测井曲线(R2=0.47)与电阻率测井曲线(R2=0.35),建立ΔLogR模型,通过对ΔLogR公式进行改进,进行ZK1601钻井的TOC值预测,预测TOC与实测的TOC线性相关性好,将该ΔLogR模型在ZK0010井进行验证,计算出的TOC与实测的TOC线性相关性良好(R2=0.72),据此可对该区其他井开展预测,获得油页岩含油率、TOC、厚度、埋深等相关参数。

The lower Jurassic Badaowan Formation oil shale ore-bearing area is situated in the Shitanyao north,Dachanggou Basin,Changchongliang area,Barkol County,Xinjiang.That is an excellent oil shale ore deposit under exploitation in China.Based on core observational research,testing and analysis,through well logging model has carried out oil shale assessment and provided basis for oil shale resources assessment in the area.The study has shown that between oil shale TOC and density,resistivity,gamma-ray logging traces existed linear correlations.Through logging traces can predict TOC,and then according to linear correlation between TOC and oil content can compute oil content.After the optimization of well ZK1601 density logging trace(R2=0.47)and resistivity logging trace(R2=0.35)has establishedΔlogR model,throughΔlogR formula modification,carried out well ZK1601 TOC value prediction,between predicted TOC and measured TOC has good linear correlation,takingΔlogR model carried out verification in well ZK0010,the computed TOC has good linear correlation with measured TOC(R2=0.72).Accordingly,prediction of other wells in the area can be carried out to acquire oil shale related parameters of oil content,TOC,thickness and buried depth etc.