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深部热流体活动与碳酸盐岩储层改造及油气成藏具有密切的关系.通过对塔里木盆地古城墟隆起奥陶系的11块样品的成岩观测和流体包裹体系统分析,识别出3期古流体活动.结合埋藏史,确定这3期流体活动的发生时间分别为:第1期以第1世代高角度裂缝及网状裂缝充填方解石为代表,推测与加里东晚期构造运动有关;第2期为构造-热液白云岩化流体,可能与塔里木盆地经历二叠纪末大规模的火山活动有关;第3期以充填于孔、缝中央的晚期方解石为代表,记录了晚期天然气充注事件,发生于喜山期.第1期流体活动伴随的构造运动导致了早期充注的油气沥青化;第2期流体活动对该区域的储层有建设性改造作用,所形成的鹰山组内幕储层成为了区内重要的勘探目的层;第3期流体活动记录了晚期天然气充注事件.因此,工区应以寻找喜山晚期天然气藏为主要勘探目标.
Deep thermal fluid activity is closely related to carbonate reservoir reform and hydrocarbon accumulation.Based on diagenesis and fluid inclusion system analysis of 11 samples of Ordovician uplift in Guchengxu uplift in the Tarim Basin, According to the burial history, the occurrence time of these three fluid activities are respectively as follows: the first period is represented by the first-generation high-angle cracks and the reticulated fracture-filled calcite, which is presumed to be related to the Caledonian tectonic movement; For the tectono-hydrothermal dolomitization fluid, it may be related to the Late Permian experiencing large-scale volcanic activity in the Tarim Basin. In the third period, the late calcite was recorded as the filling of late calcite in the middle of pores and seams, Occurred in the Himalayan period.The tectonic movement accompanied by fluid activity in the first phase resulted in the oil-gas bitumenization of the early filling. The fluid activity in the second phase had a constructive reformation effect on the reservoir in this area. Layer became the important exploration target layer in the area and the third fluid activity recorded the late natural gas filling event.Therefore, the mining area should focus on the exploration of natural gas reservoirs in the late Himalayan period.