Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (4): 89-97.doi: 10.12108/yxyqc.20200409

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Controlling factors and prediction methods of multiples of Dengying Formation in Gaoshiti-Moxi area,Sichuan Basin

DAI Xiaofeng1, XIE Zhan'an1, DU Benqiang2, ZHANG Ming1, TANG Tingke2, LI Jun2, MOU Chuan2   

  1. 1. PetroChina Research Institute of Petroleum Exploration & Development, Beijing 10083, China;
    2. Shu'nan Gas Mine, PetroChina Southwest Oil & Gas Field Company, Luzhou 646000, Sichuan, China
  • Received:2019-07-22 Revised:2019-08-30 Online:2020-08-01 Published:2020-06-16

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Abstract: There are multiples interferences of Dengying Formation in Gaoshiti-Moxi area,which reduces the accuracy of seismic reservoir prediction. It is necessary to identify and predict multiples in seismic data, so as to reduce the influence of multiples interference on current well location deployment. In view of the shortcomings of the existing methods of multiples recognition and prediction,the multiples were identified by velocity spread of the energy clusters on the seismic velocity spectrum. The multiples prediction of Dengying Formation was realized in Gaoshiti-Moxi area. The result was consistent with drilled well data,which proves the effectiveness of the method. According to the comprehensive analysis,the multiples of Dengying Formation are strong in the south and weak in the north on the whole,and have strong horizontal heterogeneity. Through seismic forward modeling and comprehensive analysis of seismic data,the areas with residual Ordovician strata develop more multiples,and multiples interference is stronger in the syncline area. According to the degree of multiples interference,the 3D seismic data in Gaoshiti-Moxi area can be divided into three types. Type Ⅰ multiples interference is weak,and seismic amplitude can truly reflect impedance characteristics of the strata. Type Ⅱ multiples' energy is similar to primary wave,and seismic data has more multiple solution. Type Ⅲ multiples interference is strong,and seismic data cannot represent the characteristics of strata. Based on the multiples prediction results,geologists can judge the reliability of seismic interpretation results,reasonably avoid risks,reduce the influence of multiples interference,and reduce the risk of well location deployment.

Key words: multiples, seismic velocity spectrum, velocity spread, Dengying Formation, Ordovician, Sichuan Basin

CLC Number: 

  • P631.4
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