四川盆地震旦系—下古生界高过成熟度烃源岩评价
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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。
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 type Ⅰ and 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.
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 type Ⅰ and 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.
引文
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2秦建中,刘宝泉,郑伦举等.海相碳酸盐岩排烃下限值研究[J].石油实验地质,2007,29(4):391~396
3赵孟军,赵陵,张水昌等.南盘江盆地主要烃源岩地球化学特征研究[J].石油实验地质,2006,28(2):162~167
4刘旋.济阳坳陷奥陶系烃源岩生物标志物地球化学特征[J].油气地质与采收率,2006,13(3):12~15
5肖贤明,刘德汉,傅家谟.沥青反射率作为烃源岩成熟度指标的意义[J].沉积学报,1991,9(增刊):49~59
6朱俊章,施和生,舒誉等.珠江口盆地烃源岩有机显微组分特征与生烃潜力分析[J].石油实验地质,2007,28(3):301~306
7肖贤明,吴治君,刘德汉等.早古生代海相烃源岩成熟度的有机岩石学评价方法[J].沉积学报,1995,13(2):112~119
8金奎励,刘大锰,肖贤明等.中国油、气源岩有机成分划分、超微与地化特征及其成烃规律[J].中国煤田地质,1995,7(1):47~51
9刘德汉,史继扬.碳酸盐岩高演化有机质的地球化学特征及油气非常规评价方法[J].石油勘探与开发,1994;21(3):113~115
10刘祖发,肖贤明,傅家谟等.海相镜质体反射率用作早古生代烃源岩成熟度指标研究[J].地球化学,1999,28(6):580~588
11张林,魏国齐,李熙喆.四川盆地震旦系—下古生界高过熟烃源岩演化史分析[J].天然气地球科学,2007,18(5):726~731
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