Optimizing Parameter "Total Organic Carbon Content" for Shale Oil and Gas Resource Assessment: Taking West Canada Sedimentary Basin Devonian Duvernay Shale as an Example
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摘要: 总有机碳含量（TOC）是页岩油气"甜点"预测、资源评价的重要评价标准之一.以加西Duvernay页岩为例，采用物质平衡的方法恢复原始TOC，从页岩储层和天然气赋存状态等方面分析现今TOC作为评价标准存在的问题.结果表明，Duvernay页岩原始与现今TOC的比值介于1.69~1.02，且热演化程度越高，原始和现今TOC的差异越大.因此，现今（残余）TOC较低并不意味着原始有机碳含量低.Duvernay页岩现今（残余）TOC与有机孔隙的发育不存在直接成因联系，现今（残余）TOC不是表征页岩储层储集能力的最佳选择.与现今TOC相比，兰格缪尔体积与原始TOC相关性更好，即，采用原始TOC评价页岩吸附能力更合理.因此，认为采用原始TOC代替现今（残存）TOC作为页岩油气资源评价和有利区优选的标准更具有理论意义和实践价值.
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关键词:
- 页岩油气 /
- 总有机碳含量 /
- 西加盆地 /
- 泥盆系 /
- Duvernay页岩
Abstract: Total organic carbon (TOC) content is regarded as one of the important standards for shale oil and gas "sweet spot" prediction and potential resource evaluation. Taking Devonian Duvernay shale in West Canada sedimentary basin as an example, in this paper uses scanning electron microscope and methane adsorption measurements to discuss the weakness of using measured TOC as parameter for reservoir and gas capacity. Initial TOC was restored, and the measured and initial TOC vs. Langmuir volume was studied to reveal their difference as evaluation parameter. The result suggests that the difference between initial TOC and measured TOC varies significantly with the ratio ranging from 1.69-1.02, which increases with the thermal maturity. Thus, low measured TOC value doesn't represent low initial TOC value. Organic pore growth in Duvernay shale has no correlation with measured TOC, which means that the measured TOC is not the optical parameter to describe shale reservoir. Compared with measured TOC, Langmuir volume exhibits better correlations with initial ones, indicating initial TOC determines gas-adsorption behavior. Thus, in this paper it is evidenced to use initial TOC, rather than measured ones, as shale oil and gas evaluation parameters. -
图 1 加西盆地泥盆系Duvernay页岩的分布
Fig. 1. Distribution of Devonian Duvernay shale in West Canada sedimentary basin
图 6 Duvernay页岩有机质转化率和排烃率随热演化的变化规律
Fig. 6. Variation of transformation ratio and expulsion ratio with Tmax in Duvernay shale
图 7 Duvernay页岩现今残余TOC与原始TOC对比
Fig. 7. Comparison of original TOC and present TOC in Duvernay shale
图 8 Duvernay页岩现今残余TOC(a)和原始TOC(b)平面分布对比图
Fig. 8. Distribution of original TOC (a) and present TOC (b) in Duvernay shale
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