Upscaling of outcrop information for improved reservoir modelling – exemplified by a case study on chalk

IF 1.9 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
D. Qu, P. Frykman, L. Stemmerik, K. Mosegaard, L. Nielsen
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引用次数: 1

Abstract

Outcrops are valuable for analogous subsurface reservoirs in supplying knowledge of fine-scale spatial heterogeneity pattern and stratification types, which are difficult to obtain from subsurface reservoir cores, well logs or seismic data. For petrophysical properties in a domain where the variations are relatively continuous and not dominated by abrupt contrasts, the spatial heterogeneity pattern can be characterized by a semivariogram model. The outcrop information therefore has the potential to constrain the semivariogram for subsurface reservoir modelling, even though it represents different locations and depths, and the petrophysical properties may differ in magnitude or variance. However, the use of outcrop-derived spatial correlation information for petrophysical property modelling in practice has been challenged by the scale difference between the small support volume of the property measurements from outcrops and the typically much larger grid cells used in reservoir models. With an example of modelling the porosity of an outcrop chalk unit in eastern Denmark, this paper illustrates how the fine-scale spatial correlation information obtained from the sampling of outcrops can be transferred to coarser-scale models of analogue rocks. The workflow can be applied to subsurface reservoirs and ultimately improves the representation of geological patterns in reservoir models.
扩大露头信息以改进储层建模——以白垩岩为例
露头对于类似的地下储层提供精细尺度空间非均质性模式和分层类型的知识是有价值的,而这些知识很难从地下储层岩心、测井或地震数据中获得。对于变化相对连续且不受突然对比支配的领域中的岩石物理性质,空间非均质性模式可以通过半变差函数模型来表征。因此,露头信息有可能限制地下储层建模的半变差函数,即使它代表不同的位置和深度,并且岩石物理性质的大小或变化可能不同。然而,在实践中,将露头衍生的空间相关性信息用于岩石物理性质建模受到了露头性质测量的小支撑体积与储层模型中使用的通常大得多的网格单元之间的比例差异的挑战。本文以丹麦东部一个露头白垩单元的孔隙度建模为例,说明了如何将从露头采样中获得的精细尺度空间相关性信息转换为模拟岩石的粗尺度模型。该工作流程可以应用于地下储层,并最终改进储层模型中地质模式的表示。
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来源期刊
Petroleum Geoscience
Petroleum Geoscience 地学-地球科学综合
CiteScore
4.80
自引率
11.80%
发文量
28
审稿时长
>12 weeks
期刊介绍: Petroleum Geoscience is the international journal of geoenergy and applied earth science, and is co-owned by the Geological Society of London and the European Association of Geoscientists and Engineers (EAGE). Petroleum Geoscience transcends disciplinary boundaries and publishes a balanced mix of articles covering exploration, exploitation, appraisal, development and enhancement of sub-surface hydrocarbon resources and carbon repositories. The integration of disciplines in an applied context, whether for fluid production, carbon storage or related geoenergy applications, is a particular strength of the journal. Articles on enhancing exploration efficiency, lowering technological and environmental risk, and improving hydrocarbon recovery communicate the latest developments in sub-surface geoscience to a wide readership. Petroleum Geoscience provides a multidisciplinary forum for those engaged in the science and technology of the rock-related sub-surface disciplines. The journal reaches some 8000 individual subscribers, and a further 1100 institutional subscriptions provide global access to readers including geologists, geophysicists, petroleum and reservoir engineers, petrophysicists and geochemists in both academia and industry. The journal aims to share knowledge of reservoir geoscience and to reflect the international nature of its development.
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