利用颗粒荧光定量分析技术研究塔里木盆地库车坳陷大北1气藏充注史

摘要

为研究塔里木盆地库车坳陷大北1致密气藏的充注史与油气分布规律,选取该气藏的DB101、DB103和DB2等3口井的36块砂岩样品,进行颗粒荧光定量分析实验.结果表明:DB101井与DB2井曾经在同一个古圈闭内,DB103井则在另一个独立的古圈闭内,古圈闭内的油藏呈层状分布特征.DB101井现今水层为早期油气的运移路径；DB103井气水界面以下可能存在残留油气层,真正的气水界面比现今气水界面深；DB2井部分古油层晚期被破坏.古油藏的分布及演化对现今油气的分布聚集有重要的影响和控制作用.%For the study of charge history and distribution law of oil and gas in the Dabei 1 tight gas reservoir in the Kuqa Depression of the Tarim Basin, 36 sandstone samples collected from wells DB 101, DB 103 and DB 2 were tested with quantitative grain fluorescence techniques. The results showed that wells DB 101 and DB 2 located in the same palaeo-trap while well DB 103 located in a separate palaeo-trap. Oils distributed in layers in those traps. The present water layers in well DB 101 were palaeo-hydrocarbon migration paths. Under the current gas-water interface in well DB 103, there might be residual oil layers, and the real gas-water interface was deeper. Part of the palaeo-oil reservoir in well DB 2 was destroyed in later stage. The distribution and evolution of palaeo-oil reservoirs played an important role in the present distribution of oil and gas rnaccumulation.