重、磁、电联合反演在银额盆地定量解释中的应用
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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 preliminarily 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 inversion under the restraint of geological,well log and seismic data,and constantly revised the model of geology-geophysics and the results 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 accuracy of quantitative interpretation.
According to the results of 2-D resistivity inversion of magnetotelluric sounding,geological structures and strata were preliminarily 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 inversion under the restraint of geological,well log and seismic data,and constantly revised the model of geology-geophysics and the results 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 accuracy of quantitative interpretation.
引文
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[5]刘建利,申安斌,陈小龙.大地电磁测深方法在内蒙古西部银根—额济纳旗盆地石炭系—二叠系油气地质调查中的应用[J].地质通报,2011,30(6):993-1000.
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