Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 101-110.doi: 10.12108/yxyqc.20210411

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Velocity modeling and imaging of volcanic rocks in Laoyemiao area， Bohai Bay Basin

SHI Wenwu1, YONG Yundong2, WU Kailong1, TIAN Yancan2, WANG Peng2   

  1. 1. Research Institute of Exploration and Development, PetroChina Jidong Oilfield Company, Tangshan 063000, Hebei, China;
    2. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China
  • Received:2020-05-25 Revised:2020-09-12 Online:2021-08-01 Published:2021-08-06

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Abstract: The volcanic rock reservoirs in Laoyemiao area of Bohai Bay Basin have great exploration potential. However,multi-stage volcanic rocks are widely developed in Neogene Guantao Formation and Paleogene Dongying Formation,which have strong shielding effect on seismic waves. There are a large number of strong and multiple reflections in seismic records. Moreover,the volcanic rocks and underlying strata have extremely irregular shapes and rapid changes in physical properties laterally, resulting in much seismic energy scattering, which restricts the accurate imaging of volcanic rocks and underlying strata,and seriously affects the quality of seismic data and fine oil and gas exploration in this area. The six-division signal-retained denoising technology and five-dimensional regularization technology were used together to improve the signal-to-noise ratio of seismic data and get broadband and high signal-to-noise ratio seismic gather for velocity modeling and depth migration imaging. Velocity model in depth domain was built by layer tomography combined with 3D grid tomography velocity modeling technology. The results show that the detailed imaging of volcanic rocks,middle-deep faults and cross-sectional imaging have been greatly improved,and the degree of well-seismic anastomosis has also been significantly improved compared with conventional processing methods. This technology has laid an important foundation for seismic interpretation and reservoir prediction in this area.

Key words: volcanic interbedding, scattering, five-dimensional regularization, six-division signal-retained denoising, grid tomography

CLC Number: 

  • P618.13
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