三维模型模拟迭代成图技术在准噶尔盆地南缘复杂构造区构造转深中的应用
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摘要
霍尔果斯背斜、玛纳斯背斜及吐谷鲁背斜同属准噶尔盆地南缘山前褶皱带第2排构造,这3大构造是早期褶皱与后期断层突破及中深部双层构造的叠加组合。对于这样的复杂构造,常规的速度分析与构造转深误差较大。针对存在的问题,三维模型模拟迭代这一变速成图方法非常适合南缘复杂构造的时深转换。该方法实现由地震叠加速度形成转深层速度模型,叠加速度谱的拾取强调解释层位与断裂的控制。三维模型模拟迭代变速成图方法提高了准南复杂构造成图精度,在霍、玛、吐背斜带构造成图的应用中取得了良好效果。
Huoerguosi, Manasi,Tugulu Anticlines belonged to the second row structures in piedmont thrust-fold belts in south margin of Junggar Basin. It was a superimposed combination shaped by early fold and late thrust breakthrough as well as mid-deep structures. As a result, its structure was very complex, the traditional methods of analyzing velocity and making depth map would cause relatively large errors. In allusion to the problems, the method of 3D modeling iteration in time-depth conversion was suitable to the time-depth conversion of complicated structures in the south margin of Junggar Basin. In this method, an interval velocity model was built from velocity spectrum constrained by reflection interfaces and fault planes. The application shows that the method can improve the accuracy of mapping of time-depth conversion, especially in Huoerguosi-Mansi-Tugulu high-steep structural belts of South Junggar Basin.
Huoerguosi, Manasi,Tugulu Anticlines belonged to the second row structures in piedmont thrust-fold belts in south margin of Junggar Basin. It was a superimposed combination shaped by early fold and late thrust breakthrough as well as mid-deep structures. As a result, its structure was very complex, the traditional methods of analyzing velocity and making depth map would cause relatively large errors. In allusion to the problems, the method of 3D modeling iteration in time-depth conversion was suitable to the time-depth conversion of complicated structures in the south margin of Junggar Basin. In this method, an interval velocity model was built from velocity spectrum constrained by reflection interfaces and fault planes. The application shows that the method can improve the accuracy of mapping of time-depth conversion, especially in Huoerguosi-Mansi-Tugulu high-steep structural belts of South Junggar Basin.
引文
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