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近年来四川盆地川东北地区下三叠统飞仙关组发现了多个高含硫化氢的大型鲕粒岩气藏,天然气探明储量已超过5000×108m3.由于该区烃源岩层数多且演化程度高,受到TSR的蚀变改造,因此气源一直难以确定.在天然气样品分析的基础上,综合分析油气地质、烃源岩的分布与演化、成藏充注与调整、以及天然气混合作用与次生蚀变等因素,认为飞仙关组气藏的主力气源是二叠系龙潭组烃源岩,其次是志留系龙马溪组烃源岩.由于圈闭形态与不同烃源岩生排烃时期的匹配差异,造成各气藏天然气成因的差异,其中,普光气田主要捕获了龙潭组烃源岩生成的天然气,混有志留系生成的原油裂解气,而渡口河、铁山坡、罗家寨等以志留系生成的原油裂解气为主,并混有龙潭组烃源岩生成的天然气.
In recent years, a large number of oolitic gas reservoirs with high H2S content have been discovered in the Feixianguan Formation of the Lower Triassic in the northeastern Sichuan Basin in the Sichuan Basin. The proved reserves of natural gas have exceeded 5000 × 108m3. Based on the analysis of natural gas samples, a comprehensive analysis of hydrocarbon geology, the distribution and evolution of source rocks, reservoir charge and adjustment, and natural gas mixing And secondary alteration and other factors, it is considered that the main gas source of the Feixianguan Formation gas reservoir is the source rock of the Longtan Formation in the Permian, followed by the source rock of the Longmaxi Formation in the Silurian. Since the trap morphology is related to different source rocks The differences between the hydrocarbon generation and hydrocarbon expulsion periods resulted in the differences of gas genesis among the gas reservoirs. Among them, the Puguang gas field mainly captured the natural gas generated from the source rocks of the Longtan Formation, mixed with the cracked gas from the Silurian oil system, while the Dukouhe, Tieshanpo, Jiazhai and other villages to the Silurian generated cracked gas-based crude oil, and mixing Longtan Formation source rock generated natural gas.