Abstract
四川盆地及邻区的震旦系灯影组四段白云岩中普遍存在充填孔洞沥青。然而，烃源岩和沥青的高成熟度以及复杂的地质构造活动增加了恢复油气成藏史的难度。近年来，Re-Os放射性同位素体系被越来越多的应用于油气生成期定年和油源对比。陕西宁强亢家洞震旦系灯影组四段古油藏中的高成熟度沥青（R<sub>b</sub>约为1.4%~2.5%）构建了约260Ma、60~70Ma和8~13Ma的Re-Os等时线年龄。其中，60~70Ma和8~13Ma的Re-Os年龄可能指示原油在受热裂解形成焦沥青过程末段地层抬升、地温降低、Re-Os体系封闭的时刻。而较老的约260Ma的Re-Os年龄与普遍的二叠纪是前寒武系、寒武系烃源岩主生烃期的观点一致，说明在原油热裂解之外，高成熟度沥青的Re-Os年龄也有可能指示生油期。同时，在263Ma时亢家洞大部分沥青与筇竹寺组烃源岩样品的<sup>187</sup>Os/<sup>188</sup>Os范围较为一致，而灯影组三段和麦地坪组烃源岩同时期的<sup>187</sup>Os/<sup>188</sup>Os较低，筇竹寺组可能是亢家洞古油藏沥青的主要烃源岩。上述认识对四川盆地北缘灯影组天然气勘探领域评价具重要的指导意义。
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