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库车前陆盆地羊塔克地区油气资源丰富,明确油气充注历史和成藏演化过程对下一步油气勘探具有重要意义.利用流体包裹体岩相学观察、显微测温分析、定量颗粒荧光分析,并结合库车前陆盆地烃源岩热演化史以及构造演化史,分析了库车前陆盆地羊塔克地区的油气成藏过程.结果表明,羊塔克地区油气具有“晚期成藏,后期改造”的特征.库车坳陷中侏罗统恰克马克组烃源岩在15Ma左右成熟(Ro>0.5%),生成的成熟原油最早是在新近纪库车早期,约4.0Ma时期,充注到羊塔克构造带,形成少量黄色荧光油包裹体,但大量充注是在约3.5Ma时期.库车坳陷中下侏罗统煤系源岩是在约26Ma时达到成熟,生成的天然气在约3.5Ma,开始大规模的向羊塔克构造带充注.天然气充注后对早期少量原油进行气洗,形成发蓝色荧光的、气液比不一的油气包裹体.油气充注后,在羊塔1地区形成残余油气藏,油水界面位于5 390.75m处.新近纪库车晚期(3.0~1.8Ma),受喜山晚期构造运动影响,羊塔克地区油气藏发生调整改造,羊塔1地区白垩系的残余油气水界面向上迁移至现今的5 379.70m处.
The Kuqa foreland basin in Yangtak region is rich in oil and gas resources, and it is of great significance to clarify the history of hydrocarbon accumulation and the process of hydrocarbon accumulation and accumulation for the next step of oil and gas exploration.Using the petrographic fluid inclusions, microscopic temperature analysis and quantitative particle fluorescence Based on the analysis of the thermal evolution history and the tectonic evolution history of the source rocks in the Kuqa foreland basin, the hydrocarbon accumulation process in the Yangtak area of the Kuqa foreland basin is analyzed. The results show that the hydrocarbons in the Yangtak area have the characteristics of “ Tibetan and Late Reformation. ”The Middle Jurassic Chakmak Formation source rocks in the Kuqa Depression rifted around 15Ma (Ro> 0.5%), and the mature crude oil was generated at the earliest of the Neogene Kuqa During the Ma period, a small amount of yellow fluorescent oil inclusions was formed in the Yangtuk tectonic belt, but a large amount of charge was formed in about 3.5 Ma.Central-Jurassic coal measures in the Kuqa depression were reached at about 26 Ma Mature, generated natural gas at about 3.5Ma, began a large scale to the sheep Tac structural belt filling. After natural gas filling a small amount of crude oil was air-washed early to form a blue fluorescent, gas and liquid ratio of oil and gas wrapped After the filling of oil and gas, a residual oil and gas reservoir was formed in Yangta 1 area The water interface is located at 5 390.75m. Late Neogene Kuqa (3.0 ~ 1.8Ma), influenced by the late Himalayan tectonic movement, the oil and gas reservoirs in the Yangtak area have been adjusted and rebuilt. The Cretaceous residual hydrocarbon water interface in the Yangta 1 area is upward Moved to 5 379.70m today.