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Single-well production history matching and geostatistical modeling as proxy to multi-well reservoir simulation for evaluating dynamic reservoir properties of coal seams
International Journal of Coal Geology ( IF 5.6 ) Pub Date : 2021-04-29 , DOI: 10.1016/j.coal.2021.103766
C. Özgen Karacan

Reservoir properties of coal seams such as gas and water effective permeabilities and gas content, as well as spatial distributions thereof, affect the success of gas production and CO2-enhanced gas recovery (EGR) with simultaneous CO2 sequestration. These properties change during production and injection operations due to variations in reservoir pressure, matrix shrinkage/swelling, and water saturation and are therefore referred to as dynamic properties. Predicting distribution of such important reservoir properties and how they evolve during production, or injection, at unsampled locations can be particularly important for field development and project economics.

In this work, dynamic properties of Black Creek coal seam of Black Warrior Basin, Alabama were mapped using pointwise results from single-well production history matching of 45 wells and classical geostatistics. It is explored if this approach can be a proxy, with its limitations, to multi-well reservoir simulation. For this purpose, a reservoir model was built using available reservoir, well and production data to compare its results with those of the geostatistical maps for the same properties. Despite the expected local discrepancies due to differences between the two approaches, the results showed similar patterns and global distributions. Specific results showed that despite long-time operation of the wells in this area, there were still areas with high gas content and low gas effective permeability within the modeled time interval that might have benefited from further development using additional wells.



中文翻译:

单井生产历史匹配和地统计学建模,作为多井储层模拟的评估煤层动态储层性质

煤层的储层性质,例如气体和水的有效渗透率和气体含量,以及它们的空间分布,会影响气体生产的成功以及同时封存CO 2的CO 2增强气体回收(EGR)。由于储层压力,基质收缩/溶胀和水饱和度的变化,这些性质在生产和注入操作过程中会发生变化,因此被称为动态性质。对于油田开发和项目经济学而言,预测如此重要的储层属性的分布以及在非采样位置的生产或注入过程中它们如何演化可能特别重要。

在这项工作中,使用来自45口井的单井生产历史匹配和经典地统计学的点状结果,绘制了阿拉巴马州黑武士盆地黑溪煤层的动态特性。探讨了这种方法是否可以作为多井储层模拟的代理,但有其局限性。为此,使用可用的储层,井和生产数据构建储层模型,以将其结果与相同属性的地统计图的结果进行比较。尽管由于两种方法之间的差异而导致了局部差异,但结果显示出相似的模式和全球分布。具体结果表明,尽管该地区的油井长期运行,

更新日期:2021-05-08
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