EVALUATION OF THE HIGH AND OVER MATURED SINIAN—LOWER PALAEOZOIC SOURCE ROCKS IN THE SICHUAN BASIN
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摘要: 四川盆地震旦系—下古生界为高成熟烃源岩,应用激光荧光诱导显微镜对高成熟度烃源岩进行观察、分析,识别出海相镜质组、海相惰质组、微粒体及沥青等几种母质类型,微粒体和沥青为2类主要母质类型。应用有机岩石学方法对烃源岩母质类型恢复,主要为Ⅰ型和Ⅱ型。在对有机碳系统测定基础上,根据不同类型有机质的恢复系数恢复原始有机碳含量,泥页岩有机碳含量一般为0.21%～17.2%,灰岩及云岩有机碳含量一般在0.1%～9.38%。应用海相镜质组及沥青成熟度来确定高成熟度烃源岩成熟度,一般等效镜质体反射率为2.36%～3.39%,达到高过成熟阶段。资源量为21.4×108t,其中乐山—龙女寺隆起区所占资源量大,是天然气富集地区。Abstract: The highly or over matured source rocks were developed in the Sinian—Lower Palaeozoic sequence in the Sichuan Basin.By using iaser fluorescence induced microscope,many matrix types,such as marine vitrinite,marine inertinite,microme,bitumen and so on,can be identified.Using organic pe-trologic approach,the original matrix types can be resumed,which mainly are typeⅠand type Ⅱ.Based on the systematic determination of organic carbon in the source rocks,the original organic carbon can be restored with recovery coefficient of different organic types.The ordinary TOC of mudstone and shale was 0.21%～17.2%,The ordinary TOC of limestone or dolomite is 0.21%～17.2%.According to the maturity of marine vitrinite and bitumen,the Ro of the source rocks in highly/over matured stage is 2.36%～3.39%.The total hydrocarbon resources of the Sinian—Lower Palaeozoic is 2.14×109 t,and the Leshan—Longnushi uplifted area is a favorable area for nature gas accumulation.
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Key words:
- TOC /
- matrix types /
- high maturity /
- Sinian-Lower Palaeozoic /
- the Sichuan Basin
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