Abstract
By integrating the fluid potential change rate analysis and finite difference method, the hydrocarbon migration and accumulation (HMA) pattern of Member 3 of the Palaeogene Shahejie Formation (Es3) in the Nangong Sag, southern Bohai Bay Basin, were quantitatively identified. The maximum and minimum points of the cross-sectional fluid potential configuration define the intersections between HMA unit boundaries and the corresponding cross-sectional view, the intersections between the preferential migration conduits and the corresponding cross-sectional view, respectively. The finite difference centred approximations for the fluid potential change rates derived from 8 sets of sections with different azimuths and the impact of the HMA unit boundaries on the HMA indicate the HMA pattern during the key reservoir-forming period. Nine HMA units and 4 favourable accumulation regions have been identified. The boundaries of the HMA units to which the Juanzizhen and Qijizhen anticline structural belts belong have the most significant impact on HMA. The 4 dominant hydrocarbon accumulation regions are mainly located in the eastern subsag belt, and there are also significant accumulation regions in the north-central part of the western slope. Integrated analysis of hydrocarbon migration directions at different structural positions indicates that hydrocarbon migration is highly heterogeneous within different HMA units and structural units. However, hydrocarbon migration within the Juanzizhen and Qijizhen anticline structural belts is oriented S ∼ SE and SSW ∼ ESE and WSW ∼ NW in the northeast and south-central regions of the sag, respectively. The new methods and results in this study will provide important insights for establishing HMA models and for accurately identifying hydrocarbon enrichment regions and hydrocarbon sources in oil-rich basins.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
