松南地区断陷层烃源岩生烃能力及主控因素分析

根据松南地区基底断裂对盆地形成演化的控制和控盆断层在不同时期活动强弱的研究,把松南地区划分为陆家堡、开鲁和彰武3个盆地群。对比分析了松南地区断陷层沙海组和九佛堂组烃源岩的有机地球化学特征,结果表明:陆家堡盆地群烃源岩的各项指标均优于开鲁盆地群和彰武盆地群,其生烃能力最强;垂向上,九佛堂组烃源岩质量较好。造成生烃能力不同的主要原因是基底断裂和控盆断层活动强度的不同及活动时间的长短,另外还受烃源岩埋藏深浅的影响。因此在今后的油气勘探工作中,应重点研究九佛堂组烃源岩,但部分断陷以研究沙海组烃源岩为主。

Hydrocarbon generation potential of source rock and main controlling factors for faulted strata in Songnan Area

Based on the study of basiu formation and ew）lution controlled by toundational fault and activity strength of basincontrolling fault in different period the different basin groups are divided, including Lujiapu, Kailu and Zhangwu basin groups in Songnan Area. Organic geochemistry measurements and analyses are conducted on dark-colored mudstones and earbonaeeous mudstones in Jiufotang and Shahai Formation hydrocarbon source rot＇ks. The resuhs indicate that the hydrocarbon generation potential of l,ujiapu basin group, which has the strongest potential of hydrocarbon generation, is better than that of Kailu and Zhangwu basin group. In vertical profile, the quality of hydrocarbon generation of Jiufotang Formation is better than that of Shahai Formation. This trend is mainly controlled by different aetivity strength and time of foundational fauh and basiu-contrnlling fauh and it is also affected by the impact of depth. Therefore, in next exploration in Songnan Area, the key point of study is the hydrocarbon souree rock of Jiufotang Formation, but in some rift basins, the hydrocarbon source roek of Shahai Formation is the major object of study.