某海域X凹陷枯竭气藏二氧化碳封存潜力估算

Estimation of Carbon Dioxide Storage Capacity of Depleted Gas Reservoirs in X Sag

刘方圆 盛志超 李久娣 严曙梅 朱睿哲

LIU Fangyuan SHENG Zhichao LI Jiudi YAN Shumei ZHU Ruizhe

中国石油化工股份有限公司上海海洋油气分公司，上海　200120

SINOPEC Shanghai Offshore Oil & Gas Company, Shanghai 200120, China

近年来国际社会在二氧化碳减排方面达成了共识，碳捕集与封存技术为二氧化碳减排的重要手段，其中海域封存是实现二氧化碳减排的一项最具发展潜力的方法之一。某海域X凹陷目前已开发的气田以凝析气藏为主，部分气田已进入开发后期，面临枯竭，枯竭后的气藏是良好的二氧化碳封存箱体。为明确X凹陷枯竭气藏的封存潜力，该研究主要估算构造、束缚和溶解三种机理的埋存量。X凹陷枯竭气藏的埋存二氧化碳的理论封存量为7.32×108 t，有效储存容量(2.39～4.63)×108 t。研究结果表明该海域封存二氧化碳的潜力较大，前景较好，为后续开展二氧化碳封存项目论证提供依据。

In recent years, the international community has reached a consensus on carbon dioxide emission reduction. Carbon capture and storage technology is an important means of carbon dioxide emission reduction, and marine storage is one of the most promising methods to achieve carbon dioxide emission reduction. At present, the developed gas fields in X Sag of a certain sea area are mainly condensate gas reservoirs. Some gas fields have entered the late stage of development and are facing exhaustion. The exhausted gas reservoirs are good carbon dioxide storage boxes. In order to further clarify the sequestration potential of exhausted gas reservoirs in X Sag, this study selected the buried storage estimation based on structural, bound and dissolution storage mechanisms to estimate the theoretical storage. It is estimated that the theoretical carbon dioxide storage capacity of exhausted gas reservoirs in X Sag is 732 million tons, and the effective storage capacity is 239～463 million tons, indicating that the carbon dioxide storage potential of X Sag in this sea area is relatively large. It provides a basis for the demonstration of subsequent carbon dioxide storage projects.

https://doi.org/10.3969/j.issn.1008-2336.2023.03.013