通化盆地石油地质特征及油气资源潜力

Petroleum geologic features and petroleum resources potential in Tonghua Basin

通化盆地为发育在前中生代基底之上的断陷盆地,经历了古生代晚期的海西运动及中侏罗世晚期的燕山运动,目前勘探程度较低。对盆地石油地质条件研究表明,通化盆地早白垩世火山喷发期后沉积阶段形成的鹰嘴砬子组、下桦皮甸子组及亨通山组为盆地主要烃源岩层位。在三棵榆树凹陷和三源浦凹陷内,烃源岩条件较好,并且有良好的生储盖组合,可作为盆地下一步勘探重点。通过热解法计算通化盆地烃源岩有利分布区生烃量为3.87×108t,资源量为0.302×108t,具有一定的油气潜力。

Tonghua Basin,as a fault basin overlying the pre-Mesozoic basement,experienced the Hercynian movement in the Late Paleozoic and Yanshan movement in the late Middle Jurassic,has been a explorated in lower degree.Research of the petroleum geological conditions indicates that during the basin evolution,the Yingzuilizi-,Xiahuapidianzi-and Hengtongshan Formations,formed in the sedimentary stages after Early Cretaceous volcanism,are the main hydrocarbon source rocks in the Tonghua Basin.The Sankeyushu Depression and Sanyuanpu Depression,are better in source rock condition,in which the source-reservoir-cap rock assemblage was found,and can be regarded as the key area for further exporation.By utilizing pyrolysis method,it is calculated that in the favorable distribution of source rocks in the Tonghua Basin,the quantity of hydrocarbon generation is 3.87×108 t and the quantity of resource is 0.302×108 t,which shows a good petroleum potential.