Methods of Detailed Geological Modeling of Reservoir Interlayers in Thick Marine Sandstones

doi:10.11885/j.issn.1674-5086.2018.11.18.02

Abstract

Abstract: This study takes the Carboniferous Donghe sandstone reservoir in the Donghe 1 Oilfield in the Tarim Basin as an example in geological modeling. It starts with a detailed single-well identification of interlayers and stratigraphic comparison of wells and employs a geological knowledge base for interlayers as well as test and dynamic data of cores to construct a three-dimensional geological model for the interlayers. It is believed that, by improving the division contrasts between the stratigraphic layers, the spatial distributions of the interlayers between and within the stratigraphic layers can be examined based on existing geological knowledge. Deterministic modeling is employed to place the spatial distributions of interlayers into the geological model. As a result, accurate three-dimensional spatial relationships between the interlayers and reservoir layers are obtained. Test data of interlayer core samples are used to establish an explanatory model for their physical properties. The explanatory results for porosity and permeability are adopted as inputs to create an interlayer property model. Thus, the results better reflected the actual underground conditions. Subsequent numerical simulation using tens of million grids demonstrates that geological modeling of reservoir interlayers in thick marine sandstones by integrating the geological knowledge base as in this study and numerical simulation with the geological model can yield satisfactory results.

Key words: thick marine sandstone, interlayer modeling, geological knowledge base for interlayers, explanatory model for physical properties of interlayers, numerical simulation using tens of million grids

CLC Number:

TE122

WANG Kaiyu, WANG Chao, FAN Jiawei, XU Yanlong, RAN Lijun. Methods of Detailed Geological Modeling of Reservoir Interlayers in Thick Marine Sandstones[J]. 西南石油大学学报(自然科学版), 2020, 42(3): 69-79.

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