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Correspondences between high‐frequency sequences and the Milankovitch Cycles of Dongying Formation in Liaoxi Uplift, Bohai Bay Basin, North‐east China

The typical wells in Liaoxi Uplift were selected to conduct studies on high‐frequency sequences and their correspondences with the Milankovitch Cycles in Dongying Formation based on integrated analysis of wireline logs and sieve residue logs. The results of well JZ‐E show that 37 ultra‐short‐term cycles, 13 short‐term cycles, 8 mid‐term cycles, and 5 long‐term cycles are identified. Meanwhile, the correspondences between high‐frequency sequences and the Milankovitch Cycles in Dongying Formation were analysed based on GR curve of well JZ‐E and MATLAB procedure. The correspondences indicate that the Milankovitch Cycles are well preserved in Dongying Formation. The thickness of long‐period cycles caused by eccentricity ranges from 2.7963 to 3.9965 m. The thickness of mid‐term cycles caused by obliquity ranges from 1.5081 to 2.1126 m. The thickness of short‐period cycles caused by precessions ranges from 0.5791 to 1.1269 m. There is a good consistency between high‐frequency sequences and the Milankovitch Cycles in Dongying Formation. The mid‐term cycle, short‐term cycle, and ultra‐short‐term cycle of high‐frequency sequence correspond, respectively, to long‐period eccentricity, short‐period eccentricity, and precession cycle of the Milankovitch Cycles. Lacustrine fluctuations caused by the change in Earth's orbit play a major role in controlling high‐frequency sequences.