松辽盆地南部保康体系上白垩统CO_2埋存条件与潜力

CO_2 Storage Conditions and Capacity of Upper Cretaceous Series in Baokang Sedimentary System in the Southwest of Songliao Basin

CO2地下埋存是一项缓解全球气候变暖的措施.采用沉积地质学的研究方法,首次对松辽盆地南部长岭凹陷的保康沉积体系沿水流方向进行连井剖面分析,结合室内显微镜薄片鉴定和岩心观察等手段,对保康体系的沉积相类型及其时空分布规律、储盖层沉积特征、水文地质及构造特征等进行了研究.结果表明,研究区青山口组-嫩江组是CO2地下埋存的良好储盖组合,同时计算研究区CO2埋存量为7.43×109 t,大约相当于2002年中国CO2排放量的2倍、2009年中国的全年排放量.

The CO2 geological storage is an effective approach to mitigate global warming. The Baokang sedimentary system of Changling depression in the south part of Songliao Basin, choosen as the study area for CO2 storage capacity, is explored with sedimentary geology approach. A connected-well＇s profile map along the flow direction of Baokang System is investigated for the first time. The sedimentary facies, temporal and spatial distribution, sedimentary features, hydrogeology feature and teetonic characteristics of Baokang sedimentary system are studied based on observing cores and identifying rock thin sections under microscope. The results show that Qingshankou to Nenjiang Formation is favorable reservoir-caprock pair for underground CO2 storage and the total amount of potential CO2 storage capacity is estimated as 7. 43× 10^9 t, which is about two times the total volume of CO2 emission in China in 2002, or the total volume of CO2 emission in China in 2009.