【摘要】 为评估电磁场分量、发射频率和观测模式对频率域海洋可控源电磁(CSEM)一维反演的影响,对经典的海洋一维油气储层模型开展一系列反演试验。研究结果表明:采用混合观测模式及多分量、多频率数据可明显改善反演效果,进一步对挪威Troll油田的CSEM数据反演并进行特征参数分析,反演所得的电阻率模型与地震解释资料吻合,在进行大规模二维或三维反演前,结合测区已知地质钻井资料可建立反演初始模型,使用该模型对实际数据进行特征参数分析,可初步判断该数据是否适合反演。更多还原

【Abstract】 In order to evaluate the effect of several factors, including the selection of electromagnetic(EM) field components, frequencies, and survey geometries, upon the inversion results for one-dimensional(1 D) frequency domain marine controlled-source electromagnetic(CSEM) problem, a series of numerical experiments on the 1 D canonical reservoir model were conducted. The results show that the inversion model can be greatly improved with multi-EM field components, multi-frequencies or the mixed survey geometries involved. Then, the real CSEM data from Troll filed of Norway was inverted, and the engenparameter analysis is performed for the inversion result. The obtained resistivity model is consistent with the seismic interpretation data. It is suggested that an appropriate starting reference model be constructed according to some prior information such as local geology and well data, and the engenparameter analysis be performed based on the model to evaluate the effectiveness of the data used for inversion.更多还原