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通过对北京西山露头剖面寒武系和奥陶系岩石裂缝中碳酸盐胶结物中的流体包裹体进行分析,结合地质分析,重点研究了流体包裹体在划分碳酸盐胶结物形成期次中的应用。研究表明,研究区发育的流体包裹体主要为盐水包裹体;包裹体均一温度集中分布在94~98℃和133~145℃这2个区间,相应的盐度区间为4%~8.9%和11.9%~12.5%;碳酸盐胶结物的形成可以分为2期,即Ⅰ期和Ⅱ期,形成深度为1 975~2 075 m和2 950~3 250 m,分别对应于中侏罗世—早白垩世和古近纪,均形成于对流带上部。
By analyzing the fluid inclusions in the carbonate cements in the Cambrian and Ordovician rock fractures in the Xishan outcrop profile in Beijing and combining with the geological analysis, we focused on the study of the fluid inclusion in the formation of carbonate cements Applications. The results show that the fluid inclusions developed in the study area are mainly saline inclusions; the homogenization temperature of the inclusions is concentrated in the two intervals of 94 ~ 98 ℃ and 133 ~ 145 ℃, the corresponding salinity ranges are 4% ~ 8.9% and 11.9 % ~ 12.5%. The formation of carbonate cements can be divided into two phases, ie stage I and stage II, with depths ranging from 1 975 to 2 075 m and from 2 950 to 3 250 m, corresponding to Middle Jurassic- Early Cretaceous and Paleogene, are formed in the upper convection belt.