Determination of Paleocurrent Directions Based on Well Logging Technology Aiming at the Lower Third Member of the Shahejie Formation in the Chezhen Depression and Its Implications

The Bohai Bay basin, mainly formed in the Cenozoic, is an important storehouse of groundwater North China Plain. sedimentary deposits transported by paleocurrents often provided favorable conditions for enrichment modern liquid reservoirs. However, due to limited seismic and well logging data, studies focused on macroscopic directions are scarce. In this study, we obtained a series data layers Es3L Formation Chezhen depression. results indicate sources from northeast, northwest, west center subsidence northern depression at that time. Based testing physical properties region were generally poor, but two abnormal overpressure zones found 3700–3800 m 4100–4300 deep intervals, suggesting potential high-quality underground By combining with other geological evidence, suggest Pacific Plate was retreating changing its direction NE–SE W–E Bohai–Luxi block suffering extrusion NE induced Lan–Liao Tan–Lu strike-slip faults early Paleogene.