Shallow hazards Investigation offshore Angola Kwanza Basin using 3D Data

Abstract

The purpose of this project thesis is to investigate shallow hazards that pose drilling and rig placement risks in Kwanza Basin (offshore Angola). These risks are naturally occurring and are widespread in offshore Angola. The project work of shallow hazard permits us to identify near geology features that may impact drilling operations and improve future well planning, also can serve as an analogue for understanding the geology of the study area.By using the 3D seismic data and seismic attribute allows us to analyze the features to be recognized and mapped. To interpret geological feature through the 3D cube, it was necessary to do a combination of surface horizons maps, seismic attributes such as RMS amplitudes, variance map and geobodies extraction for better understanding subsurface geological features.As result of the interpretation, an analysis of isolated and strong reflector was made on the seismic data by using different attributes along of the subsurface; hence, this strong reflector might be gas accumulation due to reverse polarity relative to the seabed.In addition, some depression zones called pockmarks were identified throughout are associated to the fault of upward fluids migration. This event shows the overpressure zones. Therefore, these can pose stability concerns and implications to drilling operations for offshore installations and field development.