Method for Water-Flooded Layer Evaluation in Extra-Low Permeability Reservoir in WY Block of AS Oilfield Flooded by Fresh-Water

doi:10.11885/j.issn.1674-5086.2014.08.07.02

Abstract

Abstract: The formation water is of extremely high salinity in the extra-low permeability reservoir in WY Block of AS Oilfield. After the long term water-flooding, the oil layer resistivity curves display an asymmetric U-Type and the resistivity of severely water-flooded oil layer exceeds that of original oil layer. The traditional logging evaluation approach for medium-high permeability reservoir does not apply to extra-low permeability reservoir, owing to the complicated factors of water flooding in the extra-low permeability reservoir and reservoir characteristics. The rock-electric experiment is carried out under the simulated reservoir conditions to indicate the logging mechanism of water flooding in the extra-low permeability reservoir. The resistivity value of water-flooded oil layer depends on the resistivity ratio between injection water and formation water. On the basis of logging data and core analysis, formation water salinity and SP, RT, AC logging data, the water-flooded oil layer can be identified and the mixed formation water resistivity can be obtained. The logging interpretation model is finally built up for the water-flooded layer and matches well with the actual production data.

Key words: rock-electric experiment, extra-low permeability, water-flooded layer identification, logging interpretation model, coincidence rate

CLC Number:

HUI Gang, WANG Youjing, YAN Linhui, LI Jiahong, LIU Li. Method for Water-Flooded Layer Evaluation in Extra-Low Permeability Reservoir in WY Block of AS Oilfield Flooded by Fresh-Water[J]. 西南石油大学学报(自然科学版), 2016, 38(6): 138-146.

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