松辽盆地滨北区油气运移与油源对比

Hydrocarbon migration and source rock correlation in Binbei area of Songliao Basin

针对松辽盆地滨北区油气勘探长期没有实质性突破、油气勘探前景不甚明朗的难题,该文试图从油源对比和油气运移的角度作一些分析。利用甾萜标记化合物对区内进行的油源对比和利用含氮化合物对区内进行的油气运移研究表明,延伸入滨北的长垣北端的原油可能有多个来源:即西部的齐家-古龙凹陷、东部的三肇凹陷和北部的滨北区(如黑鱼泡凹陷)。而松辽盆地主力源岩区的齐家-古龙凹陷生成的原油可以越过滨洲铁路线向北运移,但是达不到凹陷的北端。其他广大滨北区的少量油气显示与本地源岩有关。因此,滨北区的油气勘探应该立足于对滨北区源岩条件更为详细的解剖。

Studies focusing on hydrocarbon migration and source rock comparison are expounded here in this article for the reason that for quite a long time, exploration work in Binbei area has been under the circumstances of no substantial discoveries and dim prospects. Sterane and terpane biomarkers are adopted in source rock comparison and nitrogen compounds are used for studies on hydrocarbon migration. Results indicate that crude oil in the northern end of placanticline which extends to Binbei area probably sources from various origins, including Qijia-Gulong Depression in the east, Sanzhao Depression in the west and Binbei area in the north （e. g. Heiyupao Depression）. Qijia-Gulong Depression is the major origin of source rock in Songliao Basin, where the crude oil produced would migrate to the north across Binzhou railway, but would not reach the northern end of the Depression. Slight oil shows in other parts of Binbei area are indispensable with the source rock there. It is advisable that exploitation work in Binbei area should base on more detailed studies on local source evaluation.