连井井间地震资料反演中的关键问题分析

Analysis of key problems in multi-crosswell seismic data inversion

（1.中国石油大学（华东）地球资源与信息学院，山东东营257061；2.中国石油化工股份有限公司胜利油田分公司物探研究院，山东东营257022）

College of Geo-Resources and Information, China University of Petroleum, Dongying 257061, China

讨论了连井井间地震资料反演方法。实现反演的基本原理是：对深度域井间地震资料进行初步解释；建立精确的速度模型；在对井间地震剖面进行深时转换时采用sinc插值函数实现波形保真；利用对地面地震资料的认识来落实时间域井间地震资料的反射特征；利用地面地震资料良好的空间连续性弥补井间地震剖面的“漏斗”缺陷和井间资料之间横向对比性的不足；在井间地震和地面地震井旁道精细标定中，通过一致的时深关系来实现两种地震资料之间的匹配，使井旁道的标定更加合理；在利用稀疏脉冲反演方法进行连井井间地震资料反演时，通过增强横向约束保证反演波阻抗剖面的连续性。反演结果与井间地震剖面吻合较好，砂体展布范围清晰。

The impedance inversion method of multi-crosswell seismic data is discussed. The principles are as follows: ①preliminary interpretation is carried out on crosswell seismic data in depth domain to establish an accurate velocity model; ②sinc interpolating function is used in depth-time conversion to realize waveform fidelity; ③the recognition of surface seismic data is utilized to ascertain the reflection characteristics of crosswell seismic data in time domain; ④ good spatial continuity of surface seismic data is adopted to retrieve the "hopper" defect in crosswell seismic profiles and the deficiency of lateral contrast between crosswell seismic data; ⑤in fine calibration of well-side traces of crosswells and surface seismic data, coincident time-depth relation is used to match two seismic data so as to make the calibration more reasonable; ⑥in multi-crosswell seismic data inversion by sparse spike inversion method, lateral restraints are strengthened to ensure the continuity of inversed wave impedance profile. The inversion results match well with crosswell seismic profile, and the distribution range of sand bodies is clearly seen.