重、磁、电联合反演在银额盆地定量解释中的应用

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。

THE APPLICATION OF GRAVITY-MAGNETIC-MAGNETOTELLURIC JOINT INVERSION TO THE QUANTITATIVE INTERPRETATION OF YIN'E BASIN

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- suits 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~ basin show that the gravity-magnetic-magnetotelluric joint inversion can effectively overcome the multi-resolution of the single one, mor~ correctly identify strata, and greatly improve the ac- curacy of quantitative interpretation.