Combined use of Confocal Laser Scanning Microscopy and PVT simulation for estimating the composition and physical properties of petroleum in fluid inclusions
Combined use of Confocal Laser Scanning Microscopy and PVT simulation for estimating the composition and physical properties of petroleum in fluid inclusions
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DOI：
10.1016/s0264-8172(98)00079-8
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发表时间：
1999-03-01
影响因子：
4.2
通讯作者：
Booth, T
中科院分区：
文献类型：
--
作者：
Aplin, AC;Macleod, G;Booth, T
我们提出了一种确定单个石油流体包裹体中石油的成分和 PVT 性质的方法。共焦激光扫描显微镜用于生成单个石油包裹体的三维图像。因为液体石油在激光照射下会发出荧光。图像可以轻松地区分内含物内的液体和蒸汽，并可用于确定内含物的液体与蒸汽体积比。使用 PVT 建模软件，使用液体：蒸汽比率以及均化温度来确定整体成分。相包络线、等容线以及所含石油的一系列物理性质。这是通过一系列迭代的 PVT 计算来完成的，该计算匹配两个参数：(1) 室温和均化温度下石油的摩尔体积； (2)室温下夹杂物的液:汽比。探讨了该方法中的关键不确定性，包括确定液体：蒸汽比的准确性：迭代过程中使用的滴定剂气体的成分；以及为模拟所含石油的物理性质而选择的石油成分。来自同时代包裹体的数据表明，所含石油的饱和压力、气油比、粘度、摩尔体积、密度和表面张力的测定精度为百分之几。该方法的准确性有待使用实验室在严格控制的 PVTX 条件下生长的内含物进行测试来确认。然而，所含石油的物理性质很可能通过与其遗传相关的流体来更准确地模拟。如果被证明是准确的，该方法将为确定石油系统中的古压力提供常规方法。最后，我们提供了来自北海中部示例的数据，这些数据在地质上是真实的，并且首次记录了石油储层中流体压力和石油成分的演变。 (C) 1999 Elsevier Science Ltd. 保留所有权利。
We present a method to determine the composition and PVT properties of petroleum in individual petroleum fluid inclusions. Confocal Laser Scanning Microscopy is used to generate three dimensional images of single petroleum inclusions. Because liquid petroleum fluoresces under the laser. the images readily distinguish the liquid and vapour within the inclusion and can be used to determine the inclusion's volumetric liquid:vapour ratio. Using PVT modelling software, the liquid:vapour ratio is used along with the homogenisation temperature to determine the bulk composition. phase envelope, isochore and a range of physical properties of the included petroleum. This is done using an iterative series of PVT calculations which match two parameters: (1) the molar volume of the petroleum at room and homogenisation temperatures; (2) the liquid:vapour ratio of the inclusion at room temperature. Key uncertainties in the method are explored, including the accuracy with which the liquid:vapour ratio can be determined: the composition of the titrant gas used in the iterative procedure; and the composition of the petroleum chosen to model the physical properties of the included petroleum. Data from coeval inclusions suggest that the saturation pressure, Gas-Oil Ratio, viscosity, molar volume, density and surface tension of included petroleum are determined with a precision of a few percent. Confirmation of the accuracy of the method awaits tests using inclusions grown in the laboratory under carefully controlled PVTX conditions. However, it is likely that the physical properties of included petroleums are more accurately modelled by fluids which are genetically related to them. If proven to be accurate, the method will provide a routine method for determining palaeopressure in petroleum systems. Finally, we present data from a Central North Sea example which are geologically realistic and which for the first time record the evolution of fluid pressure and petroleum composition in a petroleum reservoir. (C) 1999 Elsevier Science Ltd. All rights reserved.