三维重力地震剥层联合反演

以地震资料解释的三维构造图作为模型，用重力三维正演剥离基底及基底以上界面所产生的重力效应，然后对分离后的基底岩性异常进行反演求取基底密度。在具体联合反演算法上，首次将广泛用于地震层析成像反演的DLSQR法引入位场反演，不仅增加了联合反演结果的稳定性，而且极大地提高了反演速度。理论模型的试算和实际资料的反演结果表明，两者反演的剩余密度等值线图形十分相似，剩余密度最小值和最大值相对误差小于4％。

Joint layer-stripped inversion of 3-D gravity and seismic data.

Petroleum Exploration and Development Institute,Beijing City,100083,China Abstract:Based on the model of 3 D structural map interpreted by seismic data,the 3 D forward gravity modeling is used to model the gravitational effect produced by stripped basement and interfaces above base,then inversion for separated anomaly of base rock is implemented to evaluate the basement density.As concerns the concrete algorithms of joint inversion,the DLSQR method widely used for seismic tomographic imaging is introduced in potential inversion,that not only improved the stability of joint inversion results,but also increased the inversion speed.The results of test of theoretical models and inversion of real data showed that both have similar isoplethal map of density contract,the relative errors between minimum and maximum density contract is less than 4%.