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Key techniques for prediction of fractured carbonate reservoirs in deep marine carbonate rocks in Sichuan Basin:A case study of the Maokou Formation in SN area

Zhang Guang-rong1,2,Zhang Xuan2,Yu Yi2,Zhang Hong-ying2,Liao Qi2,Zhang Fu-hong2,Zhao Ai-lin2,Liang Han2   

  1. 1.Chengdu University of Technology,Chengdu 610059,China;
    2.PetroChina Southwest Oil and Gas Field Company,Chengdu 610041,China
  • Received:2016-06-06 Revised:2016-09-06 Online:2017-08-10 Published:2017-08-10

Abstract:

The Lower Permian is one of the important strata of natural gas exploration and development in Sichuan Basin.There are strong heterogeneity,well logging evaluation,prestack processing and reservoir prediction of fracture cave type reservoirs.Therefore,to carry out research of geophysical technology and the formation of supporting technology,mainly include: first,through in-depth analysis of logging,conventional logging and electric imaging and stone wave logging data,establish reservoir logging response characteristics,grasp the fractured vertical distribution;Second,on the basis of this,put forward the amplitude preserving processing technology in in terms of static correction,SNR,consistency and improve the resolution of seismic data,the high accuracy;through the forward model,establish Maokou reservoir seismic response model,guide the optimization of seismic attributes to carry out cave of prediction;through the prestack stochastic inversion,predict quantitative reservoir.The carbonate fracture cave unit used 3D visualization technology of space carving in the depiction;Cave Automatic Tracking Based on the discrete model for fractured vuggy connectivity is analyzed.The prediction results proved consistence with the actual drilling well,which provide a basis for well deployment,and put forward “go out looking for karst structure”,shallow deep to find out the new ideas.It has important guiding significance to deepen the exploration and development of new exploration field expansion of Maokou Formation of complex carbonate gas reservoir.

Key words: Sichuan Basin, Gas reservoir, 3D seismic, Processing, Forward, Reservoir prediction

CLC Number: 

  • TE132.1

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