徐家围子断陷CO_2气毛细管封闭特征及其对成藏的控制

Capillary sealing characteristics of carbon dioxide gas and its effect on the formation of carbon dioxide gas reservoir in Xujiaweizi depression

研究了徐家围子断陷登二段泥岩盖层发育特征 ,根据烃类气体、CO2 气体之间与水界面张力的关系 ,建立了一套评价CO2 气毛细管封闭能力的方法 ,并预测了徐家围子断陷登二段泥岩盖层毛细管封闭CO2 气的能力 ;根据空间分布特征和毛细管封闭特征 ,综合评价了徐家围子断陷登二段泥岩盖层 .结果表明 ,登二段泥岩盖层质量控制着徐家围子断陷CO2 的成藏与分布 ,整个断陷大部分地区有较强的封盖能力 ,局部地区为中等或差的封盖能力 .

Based on the study of the development characteristics of K 1d 2 mudstone caprock in Xujiaweizi depression, we established a method for studying the capillary sealing ability for carbon dioxide gas by using the relation between the interface tension of methane water and that of carbon dioxide water, prospected the capillary sealing charactristics of K 1d 2 mudstone caprock in Xujiaweizi depression.Based on this ,this paper evaluated comprehensively the K 1d 2 mudstone caprock in Xujiawezi depression according to its space distributioin and capillary sealing characteristics.By using the relation between the quality of caprock and carbon dioxid shows,this paper explounded the coutrol of the K 1d 2 mudstone caprock to the formation and distribution of carbon dioxide gas reservoirs.