Influence of Low-permeability Layers on Remaining Oil Distribution in Dolomite Reservoir

doi:10.11885/j.issn.16745086.2016.06.12.01

Abstract

Abstract: The high water-production stage has started in the YM dolomite reservoir; however, the important issue is how to locate and potentially tap the remaining oil. Low-permeability layers are ubiquitous in this type of reservoir. A mechanism model was built for sensitivity analysis of permeability, thickness, attitude of the low-permeability layers, and reservoir permeability. The results show that the effect of a flow barrier depends mainly on the permeability of the layers. When permeability is lower than 0.01 mD, the flow barrier functions well. It was found that, all conditions being equal, the thicker the low-permeability layers the stronger would be the flow barrier function. According to the distribution form and style, the controlling degrees of the remaining oil are types I > II > III > IV. If two interlaced low-permeability layers were present, the controlling degrees would be types V > VI. The low-permeability layers are able to form fluid barriers over a short production time, which become the main controlling factors on the distribution of the remaining oil.

Key words: low-permeability layer, carbonate reservoir, flow barrier, numerical simulation, remaining oil distribution

CLC Number:

TE122

CAO Peng, DAI Chuanrui, MA Hui, YAN Xiaofang, CHANG Shaoying. Influence of Low-permeability Layers on Remaining Oil Distribution in Dolomite Reservoir[J]. 西南石油大学学报(自然科学版), 2017, 39(5): 143-154.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2016.06.12.01

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2017/V39/I5/143

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