Abstract:

The Shulu sag in the south of Jizhong depression is a typical rift basin. Paleogene formation develops many sets of source-reservoir-cap assemblage, showing good exploration prospects. In order to seek the breakthrough in oil and gas exploration and to clarify the main exploration direction and zones, it’s urgent to deepen the understanding of the secondary hydrocarbon migration of the study area.Taking the Second Member of Shahejie Formation as an example, based on the Arcgis software platform, we could manage the various geological information, such as source kitchen, conducting system, structural features, fluid potential, etc. After then, we simulate the direction of the secondary hydrocarbon migration with fluid potential model under the large scale conditions. The simulation results reveal that the secondary hydrocarbon migration is dominated by nose-structural belt under the restraint of development status of sandbody, and the oil and gas gather in its spine. Finally, four nose-structural belts are selected to be the favorable accumulation zones based on the understanding of simulation results and reservoirforming conditions.

Key words: Shulu sag, Paleogene, the Second Member of Shahejie Formation, secondary migration direction, simulation, major controlling factor, favorable zone