Oil & Gas Geology ›› 2011, Vol. 32 ›› Issue (5): 797-806.doi: 10.11743/ogg20110520

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Feasibility study and application of development seismic inversion-a case study from northern Changyuan oilfield of Daqing area

Li Zhandong1, Zhao Wei2, Li Yang3, Peng Zheng4, Zhang Haixiang5   

  1. 1. College of Petroleum Engineering,Northeast Petroleum University,Daqing,Heilongjiang 163318,China;
    2. The Sixth Production Plant,PetroChina Daqing Oilfield Company,Daqing,Heilongjiang 163114,China;
    3. The First Production Plant,PetroChina Daqing Oilfield Company,Daqing,Heilongjiang 163257,China;
    4. The Second Production Plant,PetroChina Daqing Oilfield Company,Daqing,Heilongjiang 163414,China;
    5. College of Earth Sciences,Northeast Petroleum University,Daqing,Heilongjiang 163318,China
  • Received:2010-12-20 Online:2011-10-28 Published:2011-12-16

Abstract:

In order to make development seismic inversion and fine reservoir description feasible,we proposed a curve reconstruction method based on frequency division compensation.As logs with different frequency can reflect features of different sandstones,we reconstructed "quasi-wave impedance" curves through high frequency restoration and low frequency compensation.Inversion feasibility analysis experiments showed that result stability could be optimized and reservoir prediction accuracy could be improved through introducing curve reconstruction inversion,simulated annealing algorithm and high well-dense inversion.Meanwhile,forward modeling and inversion proved that 2 meters thin sandstone layer interbeded in thick mudstone could be recognized through development seismic inversion.But for sandstone layers with thickness less than 2 meters,they can be recognized only when interbeded within mudstone layers greater than 2 meters thick.Well-tied seismic sedimentary facies study was also carried out to refine prediction of sandbody volume on sides of channel,channel sand connectivity,channel sand scale change,channel combination and timing of channels.Large distributary channel sandbodies are high in oil potential and remaining oil is commonly caused by imperfect injection-production well pattern.Small distributary channel sandbodies locally have high oil potential,and remaining oil is commonly caused by limited control area of well patterns.

Key words: simulate anneal, well-tied seismic inversion, multi-stage channel, development seismic inversion, Changyuan oilfield of Daqing area

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