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油气充注过程中形成的流体包裹体为研究成藏过程提供了依据。利用准噶尔盆地中部1区块56块三工河组含油储层样品,通过系统的流体包裹体显微鉴定、微束荧光光谱和均一温度测试等包裹体分析测试手段,结合盆地构造—热演化和烃源岩生排烃史模拟结果,研究了主要含油区块三工河组油气充注的期次和年代,探讨了油气充注—调整的过程。结果表明:有机包裹体主要以发黄色、蓝色、白色荧光的油包裹体为主,荧光光谱主峰波长分别对应于535~545μm、475~485μm和505~515μm等3个波长段,在成岩宿主矿物内被捕获的时序关系总体上依次变新;研究区在中晚侏罗世曾发生最早期的油气聚集,但随着晚侏罗世末的构造抬升和剥蚀,古油藏遭受破坏而形成炭质沥青;现今油气藏主要经历了2期有效油气充注,成藏时间晚于二叠系烃源岩的生烃高峰期;第一期成藏距今100~70Ma(K2),主要以莫西庄、征沙村地区的I幕发黄色荧光原油充注为标志;第二期成藏距今62~0Ma(E—Q),油气充注活动频繁且持续时间长,发黄色和蓝色、蓝色和白色荧光的烃类包裹体依次在较长的统一地质时期内叠置共存。表明各含油区块内三工河组油气藏随盆地构造演化发生了多次动态充注与调整,具有残留型、调整改造型及持续充注型等多种油气藏在空间上复合叠加的成藏特征。
The fluid inclusions formed during oil and gas filling provide the basis for studying the process of hydrocarbon accumulation. Based on the fluid inclusions microscopic identification, micro-fluorescence spectroscopy and homogenization temperature test of inclusions in the reservoir samples of 56 oil-bearing reservoirs in Block 1, Block 1, Central Junggar Basin, Hydrocarbon generation and expulsion history simulation results of hydrocarbon source rocks. The period and age of hydrocarbon accumulation in the Sangonghe Formation, a major oil-bearing block, are studied, and the process of charge-adjustment is discussed. The results show that the organic inclusions are mainly composed of yellow, blue and white fluorescent oil inclusions. The main peak wavelength of fluorescence corresponds to three wavelength bands of 535 ~ 545μm, 475 ~ 485μm and 505 ~ 515μm, respectively. The temporal sequence of catches within the minerals changed in turn. The earliest hydrocarbon accumulation occurred in the middle and late Jurassic in the study area. However, with the tectonic uplift and denudation at the end of the Late Jurassic, the paleo-oil reservoirs were destroyed to form carbonaceous Bitumen; today’s oil and gas reservoirs mainly experienced two periods of effective oil and gas filling, and the hydrocarbon accumulation later than the hydrocarbon generation peak of Permian hydrocarbon source rocks. The first period of hydrocarbon accumulation was 100-70Ma (K2) , And the Yellow Screen Fluorescent Crude Oil Filling in I area of Jiansha Village was used as a mark. The second period of reservoir formation was 62 ~ 0Ma (E-Q) with frequent and long periods of filling, with yellow and blue, blue Colored and white fluorescent hydrocarbon inclusions coexist in sequence over longer unified geologic periods. It shows that the reservoirs of Sangonghe Formation in various oil-bearing blocks have been filled and adjusted dynamically with the tectonic evolution of the basin. There are many kinds of reservoirs, such as residual type, modified and continuous type, Tibetan characteristics.