致密砂岩储层多尺度裂缝三维地质建模方法

doi:10.11743/ogg20200318

Abstract

Abstract: The fracture system in a tight sandstone reservoir is composed of multi-scaled fractures,Fractures of each scale play a different role in oil and gas recovery.Multi-scaled fracture modeling is crucial for the development of tight reservoirs.However,there are still problems in multi-scaled fracture modeling in terms of multi-scaled fractures' coupling,determination of simulation termination conditions,and efficiency improvement of constrained modeling algorithm.To solve these problems,we discuss the three-dimensional (3D) geological modeling of multi-scaled fractures in tight sandstone reservoirs in H oilfield,Ordos Basin,based on common fracture network modeling,with a view to improving the efficiency and accuracy of multi-scaled fracture modeling.The proposed multi-scaled fracture modeling method in the study includes 4 steps,namely identification of large-scaled fractures with a deterministic method,multi-scaled coupling through distribution function matching for determining the parameters required for small-scaled fracture modeling,generation of medium- and small-scaled fracture networks by an improved method of discrete fracture network modeling constrained by fracture density,and superimposition of multi-scaled fracture networks.To verify the efficiency of the proposed method,we compare the built fracture model with single-well fracture interpretation,production data,etc.in the study area,and the results indicate that the multi-scaled fracture model established by the proposed method coincides with actual geological understanding.

Key words: multi-scaled information coupling, discrete fracture network modeling, multi-scaled fracture, tight sandstone reservoir, Ordos Basin

CLC Number:

TE122

Dong Shaoqun, Lyu Wenya, Xia Dongling, Wang Shijia, Du Xiangyi, Wang Tao, Wu Yue, Guan Cong. An approach to 3D geological modeling of multi-scaled fractures in tight sandstone reservoirs[J]. Oil & Gas Geology, 2020, 41(3): 627-637.

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An approach to 3D geological modeling of multi-scaled fractures in tight sandstone reservoirs

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