论文部分内容阅读
利用流体包裹体岩相观察、定量颗粒荧光技术、全扫描荧光分析等实验方法,结合原油和天然气物理及地球化学特征,系统地探讨了牙哈构造带的油气成藏过程。研究表明,牙哈构造带经历了2期油气成藏过程:第一期发生在吉迪克组沉积期(23~12Ma),以三叠系黄山街组成熟的原油充注为主,该期原油充注量较少,原油从烃源岩排出并经过长距离侧向运移后,从牙哈构造带西侧注入,再向东部运移,在牙哈2地区古近系—白垩系储层中形成46m的古油层,吉迪克组储层内未见古油层;第二期发生在库车组沉积以后(5~0Ma),以中下侏罗统大量成熟—高成熟煤型气充注为主,天然气分别从构造带东西两侧注入,再向中部聚集,天然气首先在浮力作用下向圈闭顶部聚集,迫使古油水界面向下迁移,后由于天然气持续充注,原油遭受气洗,最终形成现今凝析气藏。
Based on the petrographic observation of fluid inclusions, quantitative particle fluorescence technique and full-scan fluorescence analysis, the hydrocarbon accumulation process in the Yaha tectonic belt was systematically discussed based on the physical and geochemical characteristics of crude oil and natural gas. The study shows that the Yaha tectonic belt experienced two phases of hydrocarbon accumulation: the first phase occurred in the Sedimentary period (23 ~ 12Ma) of the Jidike Formation, with the mature crude oil filling of the Triassic Huangshanjie Formation as the main phase. The crude oil The charge is less, the crude oil is discharged from the source rock and transported laterally by a long distance, then injected into the west of the Yaha structural zone and then migrated to the east. In the Paleogene-Cretaceous reservoir The formation of the 46m paleo-oil reservoir and the absence of an ancient oil reservoir in the Jidike reservoir have occurred. The second occurred in the middle and lower Jurassic after mature sediments (5 ~ 0Ma) Mainly natural gas injected into both sides of the structural belt from east and west, and then gathered in the central part. Natural gas first aggregated to the top of the trap under the action of buoyancy, forcing the ancient oil-water interface to migrate downwards. After the natural gas was continuously charged, Eventually forming the current condensate gas reservoir.