麦盖提斜坡玛南构造带鹰山组包裹体古流体压力特征

发布时间：2018-09-10 08:56

【摘要】：储层中流体古压力特征对刻画油气充注状态具有指示意义,流体包裹体PVTx热动力学模拟应用包裹体组分、均一温度和气液比,结合模拟软件可以恢复包裹体被捕获时的古流体压力,以塔里木盆地麦盖提斜坡玛南构造带鹰山组为例,首先应用激光共聚焦扫描显微镜测量油包裹体气液比,然后通过冷热台显微测温获得流体包裹体均一温度,最后通过荧光光谱仪,研究原油成熟度,综合划分了油气充注幕次并恢复了各幕次流体古压力,该应用有效区分了不同幕次流体古压力值。研究结果表明:玛南构造带鹰山组存在2期油气充注,第1期发生在海西中晚期,主要充注发橙色荧光的原油,其油包裹体均一温度范围43~59.2℃,伴生的同期盐水包裹体均一温度范围58.1~85.3℃,古流体压力为13.63~14.78 MPa,依据油包裹体荧光光谱参数判断该期原油为低成熟原油;第2期发生在喜山期晚期,主要充注发黄绿色、蓝绿色、蓝白色荧光颜色的原油,其油包裹体均一温度范围66~142.3℃,伴生的同期盐水包裹体均一温度范围95.4~189.2℃,古流体压力为20.09~33.52 Mpa,该期原油为中—高成熟度。研究结果有助于深化勘探区油气成藏规律的认识。
[Abstract]:The paleo-pressure characteristics of the fluid in the reservoir are instructive to describe the oil-gas filling state. The PVTx thermodynamics simulation of the fluid inclusion applies the inclusion component, homogenization temperature and gas-liquid ratio. Combined with simulation software, paleofluid pressure can be restored when inclusions are captured. Taking Yingshan formation of Manan structural belt on Maigeti slope in Tarim Basin as an example, the gas-liquid ratio of oil inclusions is first measured by laser confocal scanning microscope. Then the homogeneous temperature of fluid inclusions is obtained by means of microthermometer. Finally, the maturity of crude oil is studied by fluorescence spectrometer. The oil and gas injection episodes are comprehensively divided and the paleo-pressure of fluid is restored. This application effectively distinguishes the paleo-pressure values of different series fluids. The results show that the Yingshan formation of the Manan structural belt has two oil and gas filling stages, the first of which occurred in the middle and late Hercynian period, mainly filled with orange fluorescent crude oil, and the homogenization temperature of the oil inclusions was in the range of 4359.2 鈩，

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