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虽然近年来对川东北地区富含H2S天然气的地球化学特征、成因及来源开展了广泛研究并积累了丰富的地质、地球化学资料,但由于该地区特殊的地质环境和复杂的天然气形成演化条件,天然气成因与来源问题一直备受关注并存有争议。川东北地区天然气中H2S含量与烃类组分组成、甲烷、乙烷和CO2碳同位素组成之间的关系表明,飞仙关组—长兴组富含H2S的天然气主要是原油在硫酸盐催化下裂解的产物,可能主要来源于下志留统烃源岩;高含H2S天然气中富集重碳同位素CO2的生成,与天然气中H2S含量的降低有关,是H2S溶蚀储层碳酸盐岩的结果。
Although the geochemical characteristics, causes and sources of natural gas rich in H2S in northeastern Sichuan have been extensively studied and rich geological and geochemical data have been accumulated in recent years, due to the special geologic environment and the complicated formation and evolution of natural gas in the region, The origin and origin of natural gas have been attracting much attention and controversy. The relationship between the H2S content of natural gas in northeastern Sichuan and the composition of hydrocarbon components as well as the carbon isotope composition of methane, ethane and carbon dioxide shows that the natural gas rich in H2S in Feixianguan Formation-Changxing Formation is mainly cracked by sulfate under the catalysis of crude oil , Which may be mainly derived from the Lower Silurian source rock. The formation of enriched heavy carbon isotope CO2 in high-H2S natural gas is related to the decrease of H2S content in natural gas and is the result of H2S dissolution carbonate reservoir.