Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 122-132.doi: 10.12108/yxyqc.20200513

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Fracture prediction and modeling based on poststack 3D seismic data: a case study of shallow shale gas reservoir in Taiyang-Dazhai area

WANG Jianjun1, LI Jingliang2, LI Lin1, MA Guangchun2, DU Yue1, JIANG Yiming2, LIU Xiao2, YU Yinhua2   

  1. 1. Exploration & Development Integrated Center, PetroChina Zhejiang Oilfield Company, Hangzhou 310023, China;
    2. Beijing Lanhaizhixin Energy Technology Co., Ltd., Beijing 100101, China
  • Received:2020-01-12 Revised:2020-05-08 Online:2020-10-01 Published:2020-08-08

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Abstract: There are Common problems such as mud loss and high fracturing pressure during drilling in TaiyangDazhai area. The reliability and accuracy of quantitative prediction of fractures by geometric attributes of poststack 3D seismic data are always restricted. A modeling method based on the joint application of fracture seismic facies and discrete fracture deterministic extraction technology was proposed. By using seismic attributes such as dip angle,curvature and discontinuity,unsupervised clustering analysis based on Bayesian probability model was carry out to obtain the best clustering effect and number. The spatial system of fracture was established by vertical time slice scanning method,and all the linear structures traced were cleaned and denoised to simplify the complex geometry structure. The cleaned fractures were gridded and reconstructed. The geometric(topological) parameters of each fracture were calculated and a high-precision discrete fracture model was established. The results show that this method can be used to accurately predict the location of fault and fracture in the process of horizontal well drilling in shallow shale gas block of Taiyang-Dazhai area,and the prediction accuracy of fault and fracture reaches 92%,effectively avoiding drilling mud loss,and providing a strong support for the fracturing design. The identification of fracture seismic facies and the establishment of discrete fracture network model provide an effective basis to solve the complex construction problems during drilling and fracturing of shale gas reservoir in this area.

Key words: unsupervised cluster analysis, fracture seismic facies, discrete fracture network, fracture grid reconstruction, shallow shale gas, Taiyang-Dazhai area

CLC Number: 

  • P631.4
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