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通化盆地是发育在中生代基底之上的断陷盆地,勘探程度低,在该盆地三棵榆树凹陷钻探的通地1井发现油气显示,但油气来源尚不清楚,制约着盆地后续油气资源勘探部署工作。本文通过对通地1井原油和岩心烃源岩生物标志化合物的特征分析对比,发现通地1井原油与下白垩统下桦皮甸子组和亨通山组黑色泥质烃源岩具有类似的生物标志化合物分布特征,推测三棵榆树凹陷原油主要来自下白垩统下桦皮甸子组烃源岩,也可能来自亨通山组烃源岩,这一成果扩展了通化盆地及周缘油气勘探领域,为通化盆地下一步油气基础地质研究和勘探部署提供重要依据。
The Tonghua Basin is a faulted basin developed over the Mesozoic basement with a low exploration level. Hydrocarbons were discovered in the Tudai 1 well drilled in the three elm depression in the basin. However, the source of the hydrocarbons is not yet known, which hinders the subsequent exploration and deployment of oil and gas resources in the basin jobs. In this paper, by comparing the characteristics of biomarker compounds of Tongti-1 well with those of core oil source rocks, it is found that the Tongti-1 well crude oil and the Lower Cretaceous Xiahua Pidian Formation and the Hengtongshan Formation black muddy source rock have similar biological It is speculated that the crude oil in the three elm depression mainly comes from the hydrocarbon source rocks of the Lower Birchipiandi Formation in the Lower Cretaceous or from the source rocks of the Hengtongshan formation. This result extends the field of oil and gas exploration in the Tonghua basin and the periphery, The next step of oil and gas basic geological research and exploration and deployment of the basin provide an important basis.