南海西部盐水层CO2埋存潜力评估

南海西部东方1-1、崖城13-1和乐东等气田具有CO2含量高的特点，每年从生产出的天然气中分离出大量的CO2。为了减少CO2在大气中的排放，考虑在莺歌海地区选择合适的盐水层埋存体，拟进行CO2地质埋存示范工程。根据CO2在盐水层中的各种埋存机理，并考虑盐水层构造特征对CO2运移分布的影响，提出了一种较为准确的CO2埋存潜力评估方法，并利用此方法对筛选出的5个备选盐水层进行了评估。评估结果表明，各盐水层埋存潜力巨大，都远远大于示范工程期限内预计的CO2埋存总量，并可将这些盐水层作为将来海南省及临近广东省人为CO2的埋存场所。南海西部东方1-1、崖城13-1和乐东等气田具有CO2含量高的特点，每年从生产出的天然气中分离出大量的CO2。为了减少CO2在大气中的排放，考虑在莺歌海地区选择合适的盐水层埋存体，拟进行CO2地质埋存示范工程。根据CO2在盐水层中的各种埋存机理，并考虑盐水层构造特征对CO2运移分布的影响，提出了一种较为准确的CO2埋存潜力评估方法，并利用此方法对筛选出的5个备选盐水层进行了评估。评估结果表明，各盐水层埋存潜力巨大，都远远大于示范工程期限内预计的CO2埋存总量，并可将这些盐水层作为将来海南省及临近广东省人为CO2的埋存场所。

Estimation of CO2 storage capacity in saline aquifers in west of South China Sea

Many natural gas fields discovered in the west of South China Sea, such as DF1-1, YC13-1 and Ledong, are associated with high concentration of CO2. Considerable amounts of CO2 has to be separated from natural gas stream during the development of these gas fields each year. In order to reduce the emission of CO2 into the atmosphere, geological storage of CO2 in deep saline aquifers has been considered. This study is aimed at selecting saline aquifers in the Yinggehai region, intending to carry out a CO2 storage demonstration project. Five candidate aquifers are selected and their capacities of CO2 storage are estimated based on an accurate method which considers various mechanisms of CO2 storage in aquifers as well as the influence of aquifer structural features on CO2 migration and distribution. The assessment results show that all five aquifers are good candidates for CO2 storage with high storage potential to store all the CO2 expected during the demonstration project, and also can provide storage sites for the man-made CO2 in Hainan and Guangdong provinces in the near future.