Surface Velocity Investigation With STEM and Its Application On The Seismic Data Static Correction
The static correction method for seismic dada with shallow transient electromagnetic sounding(STEM) in the rugged areas of the western China was put forward. Contrasting the resistivity inverted from STEM to the stratum velocity observed by micro-logging at the same site showed that the coherence of the shallow structure of stratum velocity and the layered resistivity is perfect, and the relationship between stratum velocity and resistivity is much complicated. Based on the Faust formula, the modified method in which the stratum velocity is described as a polynomial function of resistivity and depth in logarithm domain was put forward. By the use of the stratum velocity from micro-logging and the resistivity from STEM the coefficients were calculated with conjugate gradient method, so the experiential formula of stratum velocity as a function of resistivity and depth was determined, with this formula the stratum velocity was imaged upon the resistivity profile. The result is important and valuable to the identification of the low velocity boundary, and also is possible to the establishment of velocity model for seismic static correction. The resolution of seismic profile after the static correction with velocity model given by STEM is much higher than that given by micro-logging.
STEM Seismic static correction Inverted resistivity Low velocity zone
YAN Liangjun SU Zhuliu HU Wenbao
Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education,Yangtze University, Jingzhou, Hubei, P.R. China 434023
国际会议
The 19th International Workshop on Electromagnetic Induction in the Earth(第十九届国际地球电磁感应学术研讨会)
北京
英文
46-50
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）