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The Influence of Fault Membrane Seal on Hydrocarbon Migration and Accumulation in the South Sesulu
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, Fifth International Conference on Fault and Top Seals, Sep 2019, Volume 2019, p.1 - 5
Abstract
South Sesulu is tectonically complex hydrocarbon province in the southern part of Kutei Basin, Kalimantan. This study presents the role of fault seal on the interplay of migration and accumulation in the fault bounding trap in the northern part of the South Sesulu are. In particular, the study focuses in the deltaic reservoir, mapped as the “13.5 Ma” horizon that has 350 ft gross thickness. We focus the issues raised due to tectonic development prior to hydrocarbon generation and charge at about 11 Ma and subsequent structural reactivation. The structural reconstruction indicates that closure of the objective trap was generated within 13.5 to 9.8 Ma and structural modelling concludes that normal faulting continued to develop in the prospective trap. Displacement backstripping and fault seal analysis (FSA) shows that the bounding fault to the trap probably acted as a migration pathway when the 11.8 Ma horizon was deposited but later acted as seal after continued displacement. FSA has enabled us to predict the hydrocarbon water contact (HWC) in terms of a membrane seal of fault which is consistent with the hydrocarbon discovery in exploration wells. We have used the same analysis to predict as yet untested column height on other closures along the F8 bounding fault.