新疆准噶尔盆地四棵树凹陷CO_(2)地质封存潜力评估

Evaluation of CO_(2) Geological Storage Potential in Sikeshu Sag,Junggar Basin,Xinjiang

CO_(2)地质封存是消减全球气候变化影响与提高油气采收的新方法,越来越受到油气开发行业的重视,但在中小尺度上CO_(2)地质封存潜力评价尚不多见.四棵树凹陷是新疆准噶尔盆地天山北坡山前冲断带的一个二级构造单元,区域内油气资源丰富.本文通过收集四棵树凹陷地区的区域指标、油藏参数、圈闭指标、气源参数以及交通环境指标的数据,提出了一种新疆准噶尔盆地四棵树凹陷CO_(2)地质封存潜力适应性评估方法,通过潜力评价公式对CO_(2)封存量进行计算.结果表明:四棵树凹陷的封存潜力为一般性适宜,理论上可实现CO_(2)封存量为92.88×10^(8) t.研究为四棵树凹陷区域及准噶尔盆地其它区块实施CO_(2)地质封存提供了方法参考.

CO_(2) geologic sequestration is a new method to reduce global climate change and improve oil and gas recovery.However,the potential evaluation of CO_(2) geologic storage at small and medium scales is rare.Sikeshu sag is a secondary tectonic unit belonging to the northern Tianshan piedmont thrust belt in Junggar basin of Xinjiang.Through the collection and study of regional indicators,reservoir parameters,trap indicators,gas source parameters and traffic environment indicators in the Sikeshu depression area,this paper proposes an adaptive assessment method for CO_(2) geological storage potential of the Sikeshu depression in Junggar basin,Xinjiang,and calculates the CO_(2) sealing stock through the potential evaluation formula.The results show that the sequestration potential of the Sikeshu depression is generally suitable,and the theoretically proven reserves can achieve CO_(2) sequestration stock of 92.88×10^(8) t.The study provides a new direction for implementing CO_(2) geological sequestration in the Sikeshu depression area and other blocks of Junggar basin,and provides reference value for subsequent relevant studies.