高精度无人机航空磁测在塔里木盆地西南部地质构造调查中的应用

Application of the high-precision UAV aeromagnetic survey in geological structure investigation in southwestern Tarim basin

受地表沙漠覆盖和复杂山前构造等影响,塔里木盆地西南部的油气地质勘探难度大,基础地质调查薄弱,油气勘探历经数十年至今尚未获得实质性重大突破。通过开展高精度无人机航空磁测,采用全夜航模式,获取到蕴含丰富地质构造信息的航空磁测数据。利用非线性滤波、低通滤波、小波变换等方法,剔除干扰异常,实现了局部异常和背景场的分离,揭示了与油气成藏相关的局部圈闭构造及其展布规律;运用三维欧拉反褶积计算区域磁性基底深度,清晰地展示了盆地基底的隆坳格局及主要生油凹陷特征,为进一步开展油气勘探战略选区及深部资源评价提供了重要成果。

Affected by complex piedmont structures and desert coverage,seismic exploration in the southwest of Tarim basin is challenging.Its primary geological survey is still relatively weak.Although it has experienced decades of oil and gas exploration,it has not yet made a substantial breakthrough.The author's team carried out a high-precision UAV aeromagnetic survey in the southwest of Tarim basin.The high-precision aromagnetic survey data are obtained,and the all-night mode is adopted.Nonlinear filtering,low-pass filtering,and wavelet transform methods are used to eliminate interference anomalies from the measured data,and the separation of local anomalies and background fields is realized.The local anomaly field clearly reveals the local trap structures and their distribution rules related to oil and gas accumulation.The 3D Eulerian deconvolution is used to calculate regional magnetic basement depth,which clearly shows the uplift depression pattern of the basin basement and the characteristics of the prominent depressions.All these results have provided significant results for further oil and gas exploration.