松辽盆地西南部金D1井九佛堂组烃源岩地球化学特征

对松辽盆地西南部金宝屯-吉尔嘎朗地区金D1井九佛堂组烃源岩的有机地球化学、生物标志化合物特征进行了系统评价，结果表明：金D1井九佛堂组暗色泥岩为差-中等烃源岩，有机质类型为Ⅱ型干酪根，处于低熟-成熟阶段；正构烷烃以"前锋型"的单峰型分布为主，主峰碳数为C₁₈和C₁₉，奇偶碳优势不明显；Pr/Ph值介于0.24~0.46，伽玛蜡烷指数介于0.11~0.32，指示烃源岩形成于还原条件下淡-微咸水湖相沉积环境；C₂₇-C₂₈-C₂₉规则甾烷分布特征略有差异，反映有机质为混合来源.总体有机地球化学特征表明金D1井九佛堂组烃源岩具有一定的生烃潜力.

GEOCHEMISTRY OF THE SOURCE ROCKS FROM JIUFOTANG FORMATION IN JD1 WELL,SOUTHWESTERN SONGLIAO BASIN

Through systematic evaluation on the organic geochemical and biomarker compound features of source rocks from Jiufotang Formation in JD1 well in Jinbaotun-Jargalang region of southwestern Songliao Basin, the authors conclude that the dark mudstone belongs to poor-medium grade source rocks with organic matter of II-type kerogen in low maturity-maturity stage. The n-alkanes are dominated by unimodal distribution of "front type" with main peak carbon numbers of C18 and C19. The odd-even predominance is not prominent. The Pr/Ph ratios(0.24-0.46) and gammacerane indexes (0.11-0.32) indicate the source rocks were formed under reduction condition with freshwater-brackish water lacustrine sedimentary environment. The distribution characteristics of C27-C28-C29 regular steranes are slightly various, reflecting mixed sources of organic matters. From the above, the source rocks in the study area have certain hydrocarbon generation potential.