重、磁、电联合反演在银额盆地定量解释中的应用

摘要

依据大地电磁测深连续二维反演结果初步确定构造与地层，通过综合分析区内物性特征给定地层与岩石的物性参数，建立正演地质-地球物理初始模型，在地质、钻井、地震资料约束下进行重、磁、电联合反演，不断修改地质-地球物理模型和大地电磁测深连续二维反演结果，使重、磁正演数据和实测数据拟合度达到最佳。在银额盆地构造与地层解释中的应用结果表明，重、磁、电联合反演可以有效克服单方法解释的多解性，准确识别地质层位，大大提高定量解释的精度。%According to the results of 2-D resistivity inversion of magnetotelluric sounding,geological structures and strata were prelimi-narily confirmed.By synthetic analysis of petrophysical characteristics,the authors established the petrophysical parameters of strata and rocks in the study area,established the initial model of geology-geophysics,carried out gravity-magnetic-magnetotelluric joint in-version under the restraint of geological,well log and seismic data,and constantly revised the model of geology-geophysics and the re-sults of 2-D resistivity inversion of magnetotelluric sounding,to make the gravity-magnetic measurement data fit in with the theoretical calculations.The results of interpretation of geological structures and strata in Yin'e basin show that the gravity-magnetic-magnetotelluric joint inversion can effectively overcome the multi-resolution of the single one,more correctly identify strata,and greatly improve the ac-curacy of quantitative interpretation.