| Lower Cretaceous Lower Sendji carbonate sediments are widely distributed in Lower Congo Basin. The Lower Sendji submarine topography that is affected on the underlying salt dome is characteristic of multi-leveled slope breaks, which increased the difficulty of reservoir prediction in the study area. Applying sequence stratigraphy theory and the mixed sedimentary model, the type and genesis of the Lower Sendji reservoirs developing in adjacent M Oil Field are analyzed, and it is deduced that just the salt movement and carbonate selective growth brought about the two-level paleo-geomorphy. Based on the unique sea level response to the paleo-geomorphy, two different sedimentary models of both low-stand and high-stand system tracts are built up. By the sequence frame analysis technology in the OpendTect software, the Lower Sendji sedimentary cycle rhythms are automatically tracked in this study area. It is predicted that the carbonate reservoirs should develop well in the low-stand system tract and the transgressive system tract in study area and resultantly the drilled data of Well X confirmed as same as the prediction. |
