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Journal of Porous Media
Fator do impacto: 1.752 FI de cinco anos: 1.487 SJR: 0.43 SNIP: 0.762 CiteScore™: 2.3

ISSN Imprimir: 1091-028X
ISSN On-line: 1934-0508

Volumes:
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Journal of Porous Media

DOI: 10.1615/JPorMedia.2019024313
pages 1351-1370

3D PRESSURE TRANSIENT ANALYSIS MODEL OF FRACTURED-CAVED RESERVOIR BASED ON SEISMIC CHARACTERIZATION

Yizhao Wan
The Key Laboratory of Gas Hydrate, Ministry of Natural Resources of the People's Republic of China, Qingdao Institute of Marine Geology, Qingdao, 266071, China; Laboratory for Marine Mineral Resources, Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao, 266071, China
Nengyou Wu
The Key Laboratory of Gas Hydrate, Ministry of Natural Resources of the People's Republic of China, Qingdao Institute of Marine Geology, Qingdao, 266071, China; Laboratory for Marine Mineral Resources, Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao, 266071, China
Changling Liu
The Key Laboratory of Gas Hydrate, Ministry of Natural Resources of the People's Republic of China, Qingdao Institute of Marine Geology, Qingdao, 266071, China; Laboratory for Marine Mineral Resources, Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao, 266071, China
Qiang Chen
The Key Laboratory of Gas Hydrate, Ministry of Natural Resources of the People's Republic of China, Qingdao Institute of Marine Geology, Qingdao, 266071, China; Laboratory for Marine Mineral Resources, Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao, 266071, China
Yuewu Liu
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China

RESUMO

Large-scale fractures and cavities cause difficulties of geological modeling, which in turn makes the fluid flow simulation difficult. In this paper, a geological modeling process based on three-dimensional (3D) seismic characterization is proposed to model real reservoirs, and then a 3D pressure transient analysis model is developed to model the fluid flow in the fractured-caved reservoirs. In this model, the reservoir is characterized as three types of media explicitly: cavities simplified as irregular polyhedrons, fractures represented by slabs, and the matrix of the rest. A finite-element method is implemented to obtain the solutions of the governing equations. Two idealized cases of fractures and cavities are presented using the model. The results show fractures and cavities play the dominant role in the fluid flow. In the fractures case, the log-log type curves can be divided into six stages, and the bilinear flow is the main feature. A larger permeability of fractures causes a longer period of bilinear flow. The log-log type curves of the cavity case are also divided into six stages. The larger permeability of cavities, the lower the horizontal line of the pressure derivative, but the influence of cavities not connected with the wellbore is limited. Comparison with the radial-composite model shows that the radial-composite model gets a volume-equivalent radius of the cavity, but a higher permeability and a negative skin factor. The developed model is also applied for the well test analysis of a field case, which shows a significant ability to characterize the fluid flow of fractured-caved reservoirs.

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