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麻江古油藏的露头和流体包裹体记录了与构造活动密切相关的两幕流体事件,第一幕主要发生在红花园组的主力储层中,代表了油气充注时期的流体活动;第二幕主要发生在导致油藏破坏的断层系统中,代表了油藏破坏阶段的流体活动.流体包裹体的均一温度,盐度和矿物晶体形态完整记录了幕式流体活动的过程:早期流体温度高,盐度低,温度变化快(可能代表突破初期的沸腾作用),相应形成细晶方解石;而流体突破之后由于与上覆储层中流体的混溶,温度会略有降低,并逐渐恒定,随着流体-岩石相互作用的进行,流体盐度升高,矿物生长速度恒定,相应形成粗晶方解石.由于幕式活动的流体在后期会进入温度相对恒定的状态,此时流体温度与储层温度相差最小,结合储层埋藏史可以确定流体活动的时间,从而为准确确定幕式流体活动的年龄提供了新的研究思路.利用每幕流体活动的粗晶方解石均一温度测定了麻江古油藏的主要成藏时间和破坏时间,认为主要的成藏时间是印支期,而主要的破坏时间在燕山晚期-喜马拉雅早期,与前人认为本区古油藏成藏期与破坏期均在加里东期的基本认识存在巨大差异.文章从主力烃源岩的生烃史和构造活动的角度初步探讨了这一结论的可靠性.
The outcrop and fluid inclusions of the Majiang ancient reservoir recorded two fluid events closely related to the tectonic activity. The first occurred mainly in the main reservoirs of the Honghuayuan Formation and represented fluid activities during the period of oil and gas filling. The two acts mainly in the fault system that led to the reservoir failure and represents the fluid activity during the reservoir failure stage.The homogenization temperature, salinity and mineral crystal morphology of the fluid inclusions fully record the process of the curtain fluid activity: the early fluid temperature High, low salinity, rapid temperature change (which may represent the boiling in the initial stage of breakthrough), and form fine-grained calcite correspondingly. After the breakthrough of the fluid, the temperature will slightly decrease due to miscibility with the fluid in the overlying reservoir and gradually become constant , With the fluid-rock interaction, the fluid salinity increases, the mineral growth rate constant, corresponding to the formation of coarse-grained calcite .Because the curtain event fluid will enter the relatively constant temperature state at this time, the fluid temperature and storage The minimum temperature difference between the layers can be used to determine the time of the fluid activity in combination with the burial history of the reservoir so as to provide a new research idea for accurately determining the age of the curtain fluid activity.Using each fluid The active homogenization temperature of coarse-grained calcite determined the main accumulation and destruction time of the Majiang paleo-oil reservoirs. The main accumulation time was Indosinian, while the main failure time was in the late Yanshanian-early Himalayas, The basic understanding of the paleo-reservoirs in the Caledonian period between the hydrocarbon accumulation period and the destructive period is quite different. The reliability of this conclusion is discussed tentatively from the hydrocarbon generation history and tectonic activity of the main source rocks.