Transcripción del resumen del autor: Tracing petroleum migration pathways is essential for predicting petroleum occurrence and reducing exploration risks associated with hydrocarbon charge, but a difficult task because of rapid lateral and vertical facies changes in lacustrine basins. An integration of geological, geophysical, and geochemical analysis is employed to investigate the origin of crude oil, the carrier-bed architecture, and migration pathways from source to trap in the JX1-1 oil field, Liaodong Bay subbasin, Bohai Bay Basin. Detailed geochemical studies suggest that three potential source-rock intervals (BLTN14001eq1, BLTN14001eq2, and BLTN14001eq3) exist in the Liaodong Bay subbasin, and crude oil in the JX1-1 field was derived from the BLTN14001eq4 and BLTN14001eq5 source rocks. The carrier beds from BLTN14001eq6 and BLTN14001eq7 source rocks to the trap were characterized using geophysical data. The fan-delta sandstone in the BLTN14001eq8 Member has an immediate contact with BLTN14001eq9 source rock and served as dominant conduit for the expulsion and migration of oil generated from BLTN14001eq10 source rock. The BLTN14001eq11 braided-delta sandstones overlying the BLTN14001eq12 source rock served as dominant conduit for BLTN14001eq13-sourced oil. The focusing of petroleum migration pathways and the merge of migration pathways in BLTN14001eq14 and BLTN14001eq15 sandstones account for the accumulation of the JX1-1 field and the mixing of BLTN14001eq16- and BLTN14001eq17-sourced oil in the field. This study suggests that the distribution of permeable sandstones and their stratigraphic contact with the source rocks are key for petroleum migration and occurrence, and integration of geophysical, geological, and geochemical studies provide an effective way to trace petroleum migration pathways.

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