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《Well Logging Technology》 2019-04
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Key Technologies for Log Evaluation of Oil Sand Reservoirs in Canada

LI Bing;LINGHU Song;BAO Xin;HOU Qiuyuan;ZHANG Lili;HUANG Liang;International Division, China Petroleum Logging CO. LTD.;  
The eighty-five pereent of the world's oil sand is located in Alberta, Canada. Oil sand reservoirs are characterized by high density, porosity, permeability and viscosity, and wide and thick distribution. At present, researches on oil sand are mainly focused on production, but less on the evaluation and application of log data. Based on characteristic oil sand wells in Canada, investigates the key technologies for log interpretation and evaluation from the point of production, and aiming at the special matrix of oil sand reservoir, difficulties in obtaining accurate physical parameters, and how to avoid less permeable interlayers in SAGD development wells, etc. The accuracy of conventional log interpretation can be improved by means of non-linear optimization of reservoir matrix parameters, establishment of regional permeability model with median grain size and determination of water saturation calculation parameters by core calibration. By fully taking use of the geological information contained in imaging log data which have high resolution, a systematic lithofacies recognition chart library has been established for the first time. The corresponding relationship between the same SAGD zones was established by combining conventional and imaging log data, and the zones(mainly thin shale) that may hinder free oil and gas flow in the SAGD process were divided, providing a logging basis for later development plans. By now the evaluation method has been applied to hundreds of wells in Canada. The results effectively support re-estimation of reserve, and play a guiding role in future locations of SAGD wells.
【CateGory Index】: P631.81;TE151
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