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济阳坳陷CO2气藏主要发育在高青-平南深断裂中南段和阳信次级凹陷西北缘及商店火山岩穹隆构造内。气藏中CO2气体浓度为69%~97%,δ13CCO2值为-5.67‰~-3.35‰,CH4/3He值为(1.01~5.65)×108,3He/4He值为(2.80~4.49)×10-6,即R/Ra为2.00~3.21,40Ar/36Ar值为317~1791,CO2/3He值为(0.25~2.61)×109。以上地球化学数据表明,济阳坳陷气藏中CO2主要来源于地幔,且幔源CO2在成藏过程中有损失,或者有壳源CO2的加入,特别是部分碳酸盐岩变质成因CO2的加入。在对CO2气来源定性分析的基础上,还需要在各来源的定量区分和CO2气藏的成藏及其与岩浆活动的时空匹配关系等方面作进一步的研究。
The CO2 gas pool in the Jiyang Depression is mainly developed in the mid-southern part of the Gaoqing-Pingnan deep fault and the northwestern margin of the Yangxin secondary depression and in the volcanic dome of the store. The concentrations of CO2 gas in gas reservoirs are 69% ~ 97%, δ13CCO2 is -5.67 ‰ -3.35 ‰, CH4 / 3He is (1.01 ~ 5.65) × 108, and 3He / 4He is 2.80 ~ 4.49 × 10 ~ 6, that is R / Ra is 2.00 ~ 3.21, 40Ar / 36Ar is 317 ~ 1791 and CO2 / 3He is (0.25 ~ 2.61) × 109. The above geochemical data show that CO2 in the gas pool of the Jiyang Depression is mainly derived from the mantle, and mantle-derived CO2 is lost in the process of hydrocarbon accumulation, or the addition of crust-derived CO2, especially the carbonaceous metamorphic origin of CO2 Join. On the basis of the qualitative analysis of CO2 gas sources, further research is needed on the quantitative distinction of each source and the accumulation of CO2 gas reservoirs and their temporal and spatial matching with magmatism.