ORGANIC GEOCHEMISTRY OF THE SOURCE ROCKS OF LOWER JURASSIC WUDANGGOU FORMATION IN SHIGUAI BASIN, INNER MONGOLIA
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摘要: 内蒙古石拐盆地广泛发育下侏罗统武当沟组煤系烃源岩.在进行野外地质勘查、典型剖面实测、样品采集及实验分析基础上，进行了有机质丰度、有机质类型、有机质成熟度等有机地球化学特征研究，初步对其生烃潜力进行评价.研究认为，石拐盆地中下侏罗统武当沟组烃源岩TOC含量主要分布于0.7%~12.4%，有机质类型为Ⅱ2型和Ⅲ型，Ro分布于0.47%~0.71%之间，演化程度为未成熟-低成熟.武当沟组是内蒙古中部地区重要的生烃层系，具备非常规油气资源潜力.Abstract: Dark mudstone and shale of Lower Jurassic Wudanggou Formation are well developed in the Shiguai Basin in Inner Mongolia. Based on geological exploration, typical profile survey, sampling and experimental analysis, the organic geochemical studies are conducted in the aspects of organic matter abundance, kerogen types and maturity of organic matter to evaluate the hydrocarbon potential. The total organic carbon (TOC) contents of the Lower Jurassic hydrocarbon source rocks of Wudanggou Formation range from 0.7% to 12.4%, corresponding to organic matter type of Ⅱ2-Ⅲ. The vitrinite reflectance is between 0.47% and 0.71%, indicating that the hydrocarbon source rocks mostly achieved low mature stage of evolution. The Wudanggou Formation is the important hydrocarbon source rock in the central area of Inner Mongolia, with potential of unconventional energy of shale gas.
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Key words:
- Shiguai Basin /
- Wudanggou Formation /
- hydrocarbon source rock /
- organic geochemistry /
- shale gas /
- Inner Mongolia
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