摘要:
四川盆地上二叠统长兴组生物礁和下三叠统飞仙关组鲕滩是“九五”期间的勘探重点,通过对长兴组—飞仙关组气藏的烃源岩、储层沥青和天然气的地球化学研究,确认了上二叠统的滨岸煤系泥岩和海槽相碳酸盐岩为主要烃源岩,长兴组—飞仙关组气藏天然气主要来源于下伏的上二叠统烃源岩,天然气以垂相运移为主,飞仙关组部分气藏天然气中硫化氢含量较高与储层中膏岩层的分布和热硫酸盐还原作用有关,上述这些特征与沉积相带密切相关。
Abstract:
Changxing Reef of Upper Permian and Feixianguan oolitic beach of Lower Triassic are the focus point of exploration work in Sichuan Basin during the ninth-five-year-plan. Through the study on organic geochemistry of source rocks of Upper Permian and Lower Triassic, reservoir bitumen and natural gases of Changxin Fm. reef and Feixianguan Fm. oolitic beach gas reservoirs, the shoreside coal measures mudstone and the sea trough carbonate of Upper Permian Series have been defined as the main source rocks,which are high maturate and controlled by the different sedimentary facies, and the reservoir bitumen and natural gases of Changxing Fm. reef and Feixianguan Fm. oolitic beach gas reservoirs are originated from the source rock of Upper Permian Series, the natural gas is a dry gas being thermally degraded from oil, the solid bitumen is a residue of oil retained in reservoir rocks, and the migration of natural gases is mainly vertical. The volume of H 2S is high in some exploratory wells of Feixianguan Fm. oolitic beach gas reservoirs, such as Gaofengchang, Longmen, Tieshanpo, Dukouhe, Luojiazhai structure, etc. H 2S is associated with the distribution of anhydrite in Feixianguan Fm. oolitic beach reservoir and related with the thermochemical sulfate reduction (TSR).And all above are closely related with the sedimentary facies.
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