叠合盆地深层油气成藏期的Re-Os同位素示踪研究：以阿满过渡带和普光、元坝气田为例

On the basis of current conditions and deficiencies of the Re-Os isotopic dating methods and applications，the transitional zone between Awati and Manjiaer depressions in the Tarim basin and the Puguang, Yuanba gas fields in the Sichuan basin were selected for the study of the Re-Os isotopic dating methods in deep layer of superimposed basin. In this study, the Re-Os isotopic dating methods under the effect of multi-phase heating would be discussed in the transitional zone between Awati and Manjiaer depressions in the Tarim basin and the And the effects on Re-Os isotope system from oil cracking and the thermochemical sulfate reduction (TSR) would be discussed in Puguang and Yuanba gas fields. These studies will effectively promote and improve the Re-Os isotopic dating methods in the deep layer of superimposed basin.

针对Re-Os同位素定年方法和应用研究现状和存在的不足，本项目选取塔里木盆地阿满过渡带和四川盆地川东北地区普光、元坝气田为解剖对象，综合使用Re-Os同位素定年技术与常规定年技术，分别就多期熟化作用下Re-Os同位素定年方法和高温热裂解与硫酸盐热化学还原作用(TSR)对Re-Os同位素体系的影响这两个科学问题开展系统地、多层次的对比研究，推动和完善Re-Os同位素定年方法在叠合盆地深层油气成藏年代学中的应用。

本项目针对Re-Os同位素定年方法体系研究的不足之处，围绕多期熟化背景下油气成藏期的Re-Os同位素研究方法和高温状态下原油裂解、TSR作用对Re-Os同位素体系的影响两个科学问题，选择塔里木盆地阿满过渡带和四川盆地川东北地区普光、元坝气田为研究对象，在前人成果的基础上通过对储层沥青、原油及其不同组分的Re-Os同位素年龄的多层次分析和对比，建立了烃源岩多期熟化背景下油气成藏期的Re-Os同位素研究方法，明确了原油裂解沥青Re-Os等时线年龄的地质意义和TSR作用对Re-Os同位素体系的影响。