Controls on clastic systems in the Angoche basin, Mozambique: tectonics, contourites and petroleum systems

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1 P Controls on clastic systems in the Angoche basin, Mozambique: tectonics, contourites and petroleum systems Eva Hollebeek, Olivia Osicki, Duplo Kornpihl Schlumberger, London, UK Introduction Offshore Mozambique has been an area of substantial industry interest over the last decade due to the major gas discoveries in the Rovuma basin. The industry hopes to extend the success of this basin southwards down the margin into the Angoche and Zambezi delta areas. We illustrate that the area between the Rovuma basin and the Zambezi delta is dominated by clastic processes, with the extension of major channel and fan systems from Angoche and Zambezi into deep water. These clastic systems form potential reservoir rocks that may be charged from Jurassic or Cretaceous sources. Onshore and offshore tectonics, oceanic currents, sedimentary input to the basin, and sea level interact to control the clastic systems. The geologic model of these clastic systems is then integrated with a regional 3D petroleum systems model to assess the potential of the different clastic plays in terms of the relative timing of key events. Geological Setting The study area is illustrated in Figure 1. The region of interest lies between the Davie Ridge to the north and the Beira High to the south, and is known as the Angoche basin. The stratigraphy of this region is poorly constrained due to a lack of well information, with the majority of the wells lying further south within the Zambezi delta region. The stratigraphy is expected to be broadly similar to that of the Zambezi delta area, with a possible early rift basin associated with onshore Karoo rifting in the Permo-Triassic, overlain by a major Jurassic rift system with half graben and lacustrine input (Figure 2). This is followed by a transition to a passive margin, with shallow marine clastics deposited during the sag phase, followed by cyclical transitions throughout the Cretaceous and Tertiary between marine shales and channel and fan sands, dependent on sea level and sediment input.

2 Fig 1. Study area in the Angoche basin, which lies between the Zambezi delta to the south and the Rovuma basin to the north. License blocks are shown, as is the D prestack depth migration data. Methods We examine the relationship between these major clastic systems and their hydrocarbon prospectivity in terms of tectonic and ocean current controls on the fan and channel positions and lithologies. The basin was interpreted based on 36,000 line km of broadband seismic data acquired in 2013, 20,000 line km of which has now been processed to depth, and offers a detailed understanding of the entire Mozambique margin. We interpret seven mega-sequences, based on seismic character and ten well ties, as well as the plays within the Angoche area. This interpretation is integrated with the tectonic history of the basin, gravity modelling, and a 3D petroleum systems model covering the whole of offshore Mozambique to constrain the timing of the key events in the basin for hydrocarbon generation, migration and accumulation.

3 Fig 2. Stratigraphic column of the Angoche basin, after from Rusk, Bertagne and Associates, Paleogeography Major changes in sedimentary input and structures are indicated from the depth and isopach maps generated during the interpretation phase, and these constrain the evolution of the basin. They illustrate that the syn-rift region of half grabens in the Angoche area is likely to be limited to a narrow zone below the present-day shelf, which is particularly steep, with seaward dipping reflectors indicating the transition to oceanic crust. To the south, the continent/ocean boundary curves around the Beira High, which is indicated by gravity modelling to be a remnant fragment of continental crust. The Beira High acts as a barrier to sedimentation until the Early Tertiary, when it is finally buried by later sediments. The sedimentary input during the Late Jurassic sag phase is extremely uniform, although it is thicker in the Zambezi delta area, suggesting that a deltaic system is already active, with the river position perhaps controlled onshore by the failed rift arm forming the Zambezi valley. By the Middle Cretaceous, basin floor fans are observed in the seismic data, which pond in an area defined by the Beira High to the south and the Davie Ridge in the north. In the Late Cretaceous, fan deposition continues on the basin floor. Also at this time wedge-shape drifts appear, with continuous moderate amplitude internal reflectors that pinchout towards the edge of the wedge

4 (Figure 3, inset). These features range from km in width, and extend for 200 km in a SW- NE trend before curving around to a SE-NW direction. They reach thicknesses of up to 2.4 km. We interpret these features as contourites, which are deep-sea sediments deposited by bottom currents. Contourites fitting the classification of detached drift, separated drift, and confined drifts formed on the seaward side of the Beira High (Stow et al., 2002). We interpret this to indicate that in the Late Cretaceous major regional oceanic currents developed and had an increasing effect on sedimentation. The contourite wedge then develops further in the Lower Tertiary, and is deflected away from the coast, probably by the flow of the Zambezi delta that bypasses the Beira High. The appearance of major canyon systems in Angoche may also deflect the contourite to a more SE- NW direction away from a coast-parallel orientation (Figure 3). Also in the Lower Tertiary, erosive channel systems appear, incising into the Beira High and the Angoche shelf, which may be indicative of higher uplift rates in the onshore hinterland between 15-0 Ma (Rudge et al., 2015). These channels are typically 4-5 km wide and can be tracked expanding into fans in the deep basin. These are then infilled in the Neogene by low-amplitude chaotic fill as sediment is channeled beyond the Beira High and into the ultra-deep. The shift in sedimentary morphology in the basin towards erosive channels in the Lower Tertiary indicates a lowstand system and may also be controlled by increased sedimentary input due to the onshore uplift associated with the East African Rift System and associated changes in river drainage areas (Stankiewicz and Wit, 2005). Therefore, substantial shifts in clastic deposition are observed in the basin, particularly between the Late Cretaceous and the Tertiary, related to onshore uplift and the formation of major contourite currents in the basin. Fig 3. Thickness of Top Cretaceous to Oligocene, draped over the depth map for the Upper Cretaceous. The contourite wedge and slope fans are clearly highlighted in green. Petroleum Systems Implications

5 We integrate the findings of the interpretation study from the Angoche area with a regional 3D petroleum systems model. The model used the seven interpretation surfaces and was calibrated to four wells, with a 2-km grid spacing. This approach ensures a consistent model for the entire Mozambique margin by including the interpretation from the entire basin. The model also takes into account the results of gravity modelling to define different crustal domains, which are then differentiated in terms of heat flow depending on whether they are continental, oceanic, or transitional crust. The results of the petroleum systems modelling are then compared to the major clastic systems mapped in Angoche to identify the timing of events relative to reservoir deposition, trap creation, and seal development. This petroleum systems model indicates that the most successful source for Angoche clastic plays is likely to be the Lower Cretaceous marine shales of the Domo Formation, which the model predicts would be the primary source for the major Palaeocene and Oligocene channel reservoir systems and Middle Cretaceous to Oligocene fans. If present, an Upper Jurassic source may also source Middle and Upper Cretaceous fans, but may struggle to source Tertiary plays as it will have already expelled prior to trap and seal formation. A Turonian source is only sufficiently mature towards the Zambezi delta area due to a higher overburden. Therefore, a 3D petroleum systems model incorporating regional interpretation, gravity modelling, and well data can be compared to the clastic depositional patterns in the basin to better constrain the timing and events leading to hydrocarbon accumulation. Conclusion The Angoche region of Mozambique is primarily a clastic system dominated by stratigraphic traps, so understanding the control on these channels and fans in terms of regional tectonics, sedimentary input, sea level, and oceanic currents is crucial to constraining reservoir location and quality. This study indicates a major shift in deposition in the Middle and Upper Cretaceous, with the dominance of large turbidite systems, and the appearance of contourite systems around the Cretaceous-Tertiary boundary. These contourites are then deflected away from the coast by the increased fluvial input into the basin in the Early Tertiary, related to onshore uplift from the East African Rift system. Mapping the channel and fan reservoirs was then integrated with a 3D petroleum systems model to understand the timing relationship between source expulsion, reservoir deposition, and seal development, and indicates that the Upper Jurassic source rock is most significant for Cretaceous plays, whilst the Lower Cretaceous source has the best expulsion timing for the Tertiary plays. An integrated approach to understanding the Mozambique basin that takes into account regional tectonics, sediment input, sea level, and oceanic currents, as well as gravity modelling, crustal domains, and petroleum systems timings, offers the best assessment of the hydrocarbon potential of the region. References Rudge, J.F., Roberts, G.G., White, N.J., and Richardson C.N., 2015, Uplift histories of Africa and Australia from linear inverse modeling of drainage inventories, Journal of Geophysical Research: Earth Surface, 120, Stankiewicz, J. and Wit, M.J., 2005, A proposed drainage evolution model for Central Africa - Did the Congo flow east? Journal of African Earth Sciences, 44, Stow, D.A.V., Faugeres, J., Howe, J.A., Pudsey, C.J., and Viana, A.R., 2002, Bottom currents, contourites and deep-sea sediment drifts: current state of the art. From: Stow, D.A.V., Pudsey, C.J., Howe, J.A., Faugeres, J., and Viana, A.R., eds(eds). Deep-Water Contourite Systems: Modern Drifts and Ancient Series, Seismic and Sedimentary Characteristics, Geological Society, London, Memoirs, 22, Acknowledgements

6 We thank Schlumberger Multiclient for the use of the seismic data.

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