Organic Carbon Distribution Characteristics of Qingshankou Shale in Songliao Basin, China
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摘要: 总有机碳（TOC）含量是页岩油气资源量评价的关键参数之一.为定量分析松辽盆地青山口组页岩TOC含量分布特征，预测有利勘探区，以测井资料为基础，首先建立研究区构造模型，应用恢复古埋深法计算镜质体反射率（Ro），通过∆logR方法预测研究区TOC含量，最后利用地质统计学方法建立了研究区页岩TOC三维量化模型.结果表明，纵向上，青一段页岩TOC含量整体分布在0%~4%范围，青二段和青三段TOC含量明显低于青一段.平面上，青一段TOC含量在三肇凹陷南部及朝阳沟阶地中部最高，青二段TOC含量整体低于2%，其在古龙凹陷北部最高，青三段TOC含量普遍低于1.4%.研究成果为松辽盆地页岩油勘探开发有利区选取提供了重要指导和参考.Abstract: Total organic carbon (TOC) content is one of the key parameters to evaluate shale oil and gas resources. In order to quantitatively evaluate the TOC distribution characteristics and predict the sweet spots of shale of Qingshankou Formation in Songliao basin, the three-dimensional (3D) structural model of the Qingshankou shale reservoir was firstly constructed based on the logging data. Then, vitrinite reflectance (Ro) was calculated by restoring the ancient burial depth of reservoir rocks, and the TOC content of the Qingshankou Formation was predicted using the ∆logR method. Finally, the 3D model of TOC content in Qingshankou Formation was built using the geostatistical method. The results show that, vertically, the TOC content of Qing 1 Member is in the range of 0%-4%. However, the TOC content of Qing 2 Member and Qing 3 Member is significantly lower than that of Qing 1 Member. Horizontally, the TOC content of Qing 1 Member in the south of Sanzhao sag and the middle of Chaoyanggou terrace is the highest. The TOC content of Qing 2 Member is lower than 2%, and that in the north part of Gulong sag is the highest. The TOC content of Qing 3 Member is generally lower than 1.4%. This work provides important guidance and reference for selecting favorable shale oil exploration and development areas in Songliao basin.
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Key words:
- Songliao basin /
- Qingshankou Formation /
- shale oil /
- total organic carbon /
- 3D geological modeling /
- petroleum geology
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图 1 松辽盆地平面图（a）与地层层序图（b）
a.红色线区域为主要研究区；b.青山口组为主要研究层位；据高翔等，2017；李敏等，2019；蒙启安等，2021；Ye et al.，2022修改
Fig. 1. Map (a) and stratigraphic sequence (b) of Songliao basin
图 2 松辽盆地青山口组测井曲线特征
Fig. 2. Typical wireline-logs of Qingshankou Formation in Songliao basin
图 3 松辽盆地古龙凹陷、齐家凹陷、大庆长垣、三肇凹陷、朝阳沟阶地的镜质体反射率与埋深交汇图
Fig. 3. Relationship between Ro and depth of Gulong sag, Qijia sag, Daqing placanticline, Sanzhao sag and Chaoyanggou terrace in Songliao basin
图 4 镜质体反射率Ro与有机质成熟度LOM关系图（据Crain, 2010改）
Fig. 4. Relationship between vitrinite reflectance (Ro) and level of maturity (LOM)
图 7 青山口组TOC含量属性模型（a）、青山口组顶面深度等值线图及剖面位置（b）、A-A’、B-B’、B-C和B-D剖面的TOC含量分布特征（c）
Fig. 7. 3D TOC content model of Qingshankou Formation (a), contour map of the Qingshankou Formation and profile location (b) and TOC content distribution corresponding to profiles A-A', B-B', B-C and B-D (c)
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