基于米兰科维奇天文旋回恢复地层剥蚀厚度——以松辽盆地X油田青山口组为例

基于米兰科维奇天文旋回理论分析松辽盆地X油田青山口组剥蚀厚度，频谱分析和小波变换揭示出青山口组存在米兰科维奇天文旋回，可检测出100 ka偏心率、40 ka斜率和20 ka岁差3个周期。研究区的42口探井滤波结果显示，100 ka偏心率周期数量在35~43之间，说明地层存在剥蚀现象。研究表明，X油田青山口组剥蚀量在0~98 m之间，自东北向西南，其剥蚀厚度逐渐减薄，在西南出现大面积分布的未剥蚀区；青山口组在沉积过程中或沉积末期，X油田局部区域出现构造抬升并遭受剥蚀。

Recovery of denuded strata thickness based on Milankovitch Astronomical Cycles: A case study of Qingshankou Formation in X Oilfield,Songliao Basin

The Milankovitch Astronomical Cycles were applied to study the erosion thickness of Qingshankou Formation (K₂qn) in the X Oilfield, Songliao Basin. Spectral analysis and wavelet transform revealed that the Milankovitch Cycles occurred in the K₂qn. We detected the eccentricity period of 100 ka, obliquity period of 40 ka and precession period of 20 ka in the K₂qn. The bandpass filtering of 42 exploratory wells in the X Oilfield showed that, the K₂qn has 35 to 43 eccentricity periods of 100 ka, which proved erosion phenomenon. The erosion thickness of K₂qn is 0-98 m, and gradually decreases from northeast to southwest, where non-denuded areas distribute widely. Tectonic uplift and erosion took place regionally in the X Oilfield during or at the end of the sedimentation of K₂qn.