珠江口盆地惠州21-1构造二氧化碳地质封存数值模拟  

NUMERICAL SIMULATION FOR OFFSHORE STORAGE OF CARBON DIOXIDE IN HUIZHOU 21-1 TRAP,PEARL RIVER MOUTH BASIN,CHINA

作　　者：彭佳龙[1,2] 陈广浩[1] 周蒂[1] 李鹏春[1] 吴建耀 

机构地区：[1]中国科学院南海海洋研究所边缘海地质重点实验室,广州510301 [2]中国科学院大学,北京100049 [3]中海石油(中国)有限公司深圳分公司研究院,广州510000

出　　处：《海洋地质前沿》2013年第9期59-70,共12页Marine Geology Frontiers

基　　金：国家自然科学基金(41372256);中国地质调查局地质调查工作项目(1212011220061)

摘　　要：二氧化碳(CO2)地质封存是减少温室气体向大气排放的有效措施之一,而CO2海上地质封存是其中的一个重要领域。以距离广东沿海约179km的珠江口盆地惠州凹陷惠州21-1构造为例,建立三维地质模型,利用TOUGH2程序模块开展了CO2注入咸水层地质封存模拟研究;分析了CO2注入咸水层后的运移分布和溶解扩散情况以及地层压力变化特征;并且通过设置8个对比方案,进行了渗透率纵横比、盐度、渗透率、孔隙度等4个参数的敏感性分析。结果表明,所建的惠州21-1构造三维地质模型能够较好地描述CO2在注入层中的运移过程和分布状况;珠江组下部的局部盖层由于泥岩厚度较小且渗透率相对较高,存在局部封盖效果不佳现象;渗透率纵横比、储层孔隙度、渗透率等取值变化对封存效果影响较大,而地层水盐度在33～39范围变化,对CO2注入运移分布与溶解没有明显影响。Storing carbon dioxide （CO2） underground is one of the effective measures to reduce greenhouse gas in the air, and the offshore geological storage is an important choice for CO2 storage. Guangdong province is one of the most developed areas in China, which emits a large amount of CO2. The CO2 geological storage potential is limited onshore but great in offshore basins to the province. Therefore, the CO2 offshore geological storage is significant to a low-carbon economy of Guangdong. In this paper, the Huizhou 21-1 structure, located in the Huizhou sag about 179 km from the coast, was selected as a case for offshore CO2 injection and sequestration simulation. A 3-D model was built up and TOUGH2 Producer was used to do simulation. The migration, distribution, dissolution and formation pressure variation after CO2 injection were studied. 8 comparison cases were used to analyze the impacts of permeability, porosity, salinity and vertical versus horizontal permeability ratio. Re suhs indicate that the 3D model can provide a good description of the migration process and the distribution status of the CO2 in the reservoir. One local seal in the Lower Zhujiang Formation presents an ineffective cap, because of its small thickness and relatively high permeability. Changes in permeability, porosity and vertical versus horizontal permeability ratio have significant effects on injection and sequestration in Huizhou 21-1 structure, but the salinity change, which varies in a range of 33-39, does not affect the process significantly.

关 键 词：深部咸水层 CO2海上地质封存 数值模拟 惠州21-1构造 珠江口盆地 

分 类 号：TE122[石油与天然气工程—油气勘探]