Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (3): 104-112.doi: 10.12108/yxyqc.20210310

• EXPLORATION TECHNOLOGY • Previous Articles     Next Articles

Application of near-surface Q compensation technology in tight gas exploration in central Sichuan Basin

LIU Huan, SU Qin, ZENG Huahui, MENG Huijie, ZHANG Xiaomei, YONG Yundong   

  1. PetroChina Research Institute of Petroleum Exploration and Development-Northwest, Lanzhou 730020, China
  • Received:2020-05-25 Revised:2020-05-25 Published:2021-06-03

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Abstract: In view of the lenticular distribution and multi-stage superimposed development characteristics of tight sandstone reservoirs in central Sichuan Basin，improving the resolution of seismic data and restoring sand body amplitude characteristics are of great significance to the exploration and development of tight sandstone gas in this area. Considering the influence of the special surface seismic conditions and the strong attenuation effects in the low velocity layer， a near-surface model was established by micro-logging constrained tomographic static correction technology to obtain the traveltime of the low velocity layer. The centroid-frequency shift method was used to estimate a near-surface Q model based on shallow reflection wave data， so as to realize near-surface Q compensation. The results show that the near-surface Q compensation technology can effectively improve the resolution of seismic data，improve the lateral continuity of seismic events，and restore the amplitude characteristics of channel sand bodies. The application of this technology is conducive to identify the contact relationship of sand bodies with strata and faults，and can provide higher-quality seismic data for subsequent interpretation.

Key words: near-surface, Q compensation, high resolution, micro-logging constrained tomographic static correction, tight sandstone gas

CLC Number: 

  • P631.4
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