南祁连盆地下日哈坳陷大加连组烃源岩评价

Evaluation of Hhydrocarbon Source Rock of Dajialian Formation of Xiariha Depression in South Qilian Basin

南祁连盆地下日哈坳陷中三叠统大加连组碳酸盐岩类烃源岩广泛发育。通过野外剖面样品采集,并运用有机碳测试、干酪根分析、岩石热解以及饱和烃气相色谱技术进行室内样品测试,综合评价了研究区碳酸盐岩露头样品的有机质丰度、类型以及成熟度。结果表明:大加连组烃源岩有机质丰度中等,有机质类型主要为Ⅱ2型,有机质达到成熟-高成熟阶段。综合评价为差-中等烃源岩。

The hydrocarbon source rock of the middle triassic dajialian formation carbonate rock widely distribute in South Qilian Basin of Xiariha Depression.Through the outcrop samples collected and used of organic carbon test,kerogen analysis,rock pyrolysis and gas chromatography of saturated hydrocarbon for indoor sample test,the authors discussed organic matter abundance,type and maturity of outcrop carbonate samples of dajialian formation in the study area.The results show that the organic matter abundance is medium,the organic matter type isⅡ2,and the organic matter maturity has reached mature to high mature stage.It is finally eveluated as poor-medium hydrocarbon source rock.