Abstract:

For the purpose of making rational single-well production programs for Chang 8 reservoir of M wellblock in Huanxian oil district area,Longdong and optimizing productivity of M wellblock,we performed a comprehensive study through integrating static geologic features of the reservoir such as lithologies,physical properties,oil-bearing properties with dynamic features like seepage flow patternss and production performance.Based on the geological data,core data,logging data and phase permeability data of the M wellblock,we carried out the research on reservoir characteristics,residual oil distribution and single-well productivity,and predicted the reasonable single-well production of this area.Chang 8 reservoir of M wellblock shows typical ultra-low permeability,significant logging response features and double wettability to oil and water.The reservoirs in M wellblock are structural-lithological reservoirs and the oil-water distribution is controlled by lithology.Oil-bearing properties are good in reservoirs with good poroperm characteristics along the main channel and in reservoirs on relative structural highs.Current production of M wellblock is mainly from southeastern-central part of M wellblock,with residual oil mainly occurring in the northern part and local southern-central part.The physical parameter method,test data conversion method and production test method are suitable for the prediction of single-well production in the study area.The rational single-well production is 3.5~4.0 t/d.These results provide important data-base for the further development of Chang 8 reservoir.

Key words: reservoir characteristics, single-well productivity prediction, M wellblock, Huanxian oil district, Longdong area