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流体包裹体成分代表了古代流体的成分和性质,通过对比鄂尔多斯盆地二叠系包裹体气体、煤成气及现今天然气藏中气体的组分及碳同位素,探讨了初次运移、成藏过程中及成藏后的次生变化对气体组分及碳同位素组成的影响.结果表明:气体在从煤系源岩运移到砂岩储层的初次运移过程中,气体的组分发生了明显的分馏,甲烷碳同位素比值未受明显影响;上古生界天然气在储层运移过程中发生了运移和扩散分馏;在天然气藏形成后的漫长历史过程中受各种次生作用的影响较小,天然气的组分和碳同位素组成均未发生明显变化.
The fluid inclusions represent the composition and properties of ancient fluids. By comparing the Permo-Carboniferous gas, coal-derived gas and gas compositions and carbon isotopes in the Ordos Basin, And the effect of secondary changes after gas accumulation on gas composition and carbon isotopic compositions were studied.The results show that during gas migration from coal source rocks to sandstone reservoirs, Fractionation and methane carbon isotope ratio were not significantly affected. In the Paleozoic, natural gas migration and diffusion fractionation took place during the migration of reservoirs. In the long history after the formation of natural gas reservoirs, the secondary effects were less affected , The composition of natural gas and carbon isotope composition did not change significantly.