应用储层流体包裹体PVTX模拟研究油气成藏期次——以塔里木盆地托甫台地区为例

        储层流体包裹体PVTX模拟被广泛用来确定包裹体的捕获温度与压力，进而精确恢复油气运移/成藏的时间/ 深度。应用该VTFlinc 模拟方法，选择塔里木盆地塔河油田外围托甫台地区的TP2井，对其奥陶系碳酸盐岩储层中的流体包裹体开展了研究，根据包裹体的岩相学、显微测温、激光拉曼光谱、激光共聚焦显微镜等分析，研究了包裹体的形成期次、成份及热力学特征，并模拟计算了包裹体形成的古温度和古压力，进而推断了油气充注的时间和成藏期次。结果表明，TP2井区主要存在两期油气充注，第一期大致在加里东晚期，时间距今420~405 Ma，第二期大致在喜山晚期，时间距今8~2 Ma。以往研究认为塔河油田主体部位的后期喜山期油气充注成藏事件并未影响到这一地区，而通过本文应用的新方法研究，证明了该期油气成藏事件存在，这为区域油气勘探提供了新的参考信息，也充分展示出本研究方法所具有的潜在重要推广应用意义。

Application of the PVTX Simulation of Reservoir Fluid Inclusions to Estimate Petroleum Charge Stages: A Case Study in the Tuoputai Area of Tarim Basin

PVTX simulation of reservoir fluid inclusions has been widely applied to determine trapping pressures and
temperatures of inclusions, and in turn to reveal charge histories in petroleum reservoirs. In this paper, we present a case studyof the Middle Ordovician Yijianfang Formation carbonate reservoir in the Tuoputai area of Tarim Basin, using the VTFlinc
simulation method. Based on an integrated study of petrography, microthermometry, laser Raman spectrum, and confocal laser scanning microscope analyses, the inclusions were studied for forming stages, compositions, and thermodynamics. These further indicate the paleo-temperature and pressure of the inclusion formation. The petroleum charge time and stages are inferred. There were two stages in general, i.e., 420-405 Ma of the late Caledonian stage and 8-2 Ma of the late Himalayan stage. Previous work suggests that the Himalayan petroleum charge event of the Tahe oilfield did not reach here, but this study using the new method shows otherwise. Thus, the method is promising in applications.