Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 108-114.doi: 10.3969/j.issn.1673-8926.2015.03.017

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Research and application of high-precision merged static correctiontechnology based on variogram

ZHANG Yongfeng1， WANG Peng2， ZHANG Yabing3， XU Xiaoping3， SU Qin2， XU Xingrong2   

  1.  1. Xibei Engineering Corporation Limited ， PowerChina ， Xi ’ an 710065 ， China ； 2. PetroChina Research Institute of Exploration and Development-Northwest ， Lanzhou 730020 ， China ； 3. Reserch Institute of Exploration and Development ， PetroChina Jilin Oilfield Company ， Songyuan 131200 ， Jilin ， China
  • Online:2015-05-26 Published:2015-05-26

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Abstract:

 The travel-time curve of seismic refraction waves is distorted by complex surface geological structures and cannot in-phase stack, so we need to carry out static correction of seismic data. Each static correction method has its own application condition: the elevation statics method cannot eliminate the effect of low velocity; the model statics method is limited by the length of alignment and the depth of tracking, so it is difficult to fully reflect the form of lowvelocity zone bottom boundary; the refraction statics method is only applied for areas with flat surface, uniform lateral velocity and significant refractive layers；the tomography statics method is adapted to any surface model inversion, but the inversion results are instability. A certain kind of static correction cannot solve all problems for increasingly complex exploration areas. This paper presented a high-precision three-dimensional static correction method based on variogram fitting reconstruction which is applicable to complex region with a variety of surface types, it can achieve fitting and reconstruction of different statics, solve the problem of different static correction advantage fitting in the complex surface conditions, and effectively improve the image quality of three-dimensional seismic data to ensure the reliability of structural morphology.

Key words:  high-precision static correction, variogram, fitting and reconstruction, complex surface areas

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