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包裹体包含着其形成时的地层孔隙流体,其化学组成和性质随地层流体的演变而异,能提供地质史上流体运移时间和温度等信息,在油气藏地球化学研究中有广泛的用途。利用流体包裹体研究油气充注史的核心问题是流体包裹体均一化温度的可靠性、埋藏热演化史的准确性。本文将从流体包裹体均一化温度测定出发,结合盆地热演化史,系统分析鄂尔多斯盆地上古生界各个含气层系的油气充注史。结果表明上古生界气层中包裹体均一化温度具两期分布,可以得出天然气可能有两次注入成藏作用或是一次成藏作用后又经历了后期抬升过程中发生的再分配、调整、补充作用的结论。
The fluid inclusions in the fluid inclusions include the formation pore fluid. The chemical composition and properties of fluid inclusions vary with the evolution of formation fluids. They can provide information on fluid migration time and temperature in geological history and are widely used in the geochemical research of oil and gas reservoirs. The core issue of using fluid inclusions to study the history of hydrocarbon filling is the reliability of homogenization temperature of fluid inclusions and the accuracy of the history of buried thermal evolution. Starting from the homogenization temperature of fluid inclusions and combining with the thermal evolution history of the basin, this paper systematically analyzes the hydrocarbon filling history of each gas layer in Upper Paleozoic in the Ordos Basin. The results show that the homogenization temperature of the upper Paleozoic gas reservoirs has a two-period distribution. It can be concluded that natural gas may be injected into the reservoir two times or once formed and then undergo the redistribution and adjustment during the later uplift , Supplement the role of the conclusion.