Structural Framework Derived from Surface Satellite Data Integrated with Subsurface Gravity-seismic Imagery, SE Kenya

This study reveals that surface satellite-derived structural results integrated with subsurface gravity and seismic imagery provides explorers a reliable assessment of the structural framework when searching for natural resources in new ventures, such as the Lamu Embayment, Kenya. This data integration shows that some of the surface faults extend at depth through the sedimentary covers as illustrated by the gravity contrasts and seismic interpretation. The NNW-SSE-trending and ENE-dipping normal faults are major basin bounding faults to N-S-oriented half-grabens and NNW-SSE-oriented Tana rifting zone, respectively. These bounding faults are probably Precambrian basement structures that were reactivated during subsequent tectonic events, e.g. Pliocene-Quaternary in the east. This age is inferred from NNW-SSE normal and ENE-WSW and WNW-ESE to NW-SE strike-slip faults, and fluvial networks affecting and incising, respectively, the Miocene-Quaternary deposits. The faults can delineate potential structural traps, e.g. uplifted footwalls of normal faults, roll-over anticline, which may be good traps for hydrocarbon accumulations. Present-day extension direction along the Kenyan coast is inferred as E-W in the south and ENE-WSW in the north. Analysis and conclusions of this study form part of the early stage of the area evaluation and need to be integrated with other datasets (FTG, seismic and more fieldwork).