Basement Structure

c1VIDL Network experience can introduce you to Basement Structure. Basement structure and basement structural history are two key parameters in any basin evaluation or regional geological analysis. A basement structure map provides a unique tool for interpretation of structural style and for correlation between basement structure and structure in overlying sediments. It can also be used to explain relationships between basement structure and oil/gas distribution in the region.

However, in many world-wide onshore/offshore regions, especially in areas where basement is believed to be deep, interpretation of its configuration and actual depth can be very speculative. In those areas there is usually a scarcity of basement-related hard data such as well penetrations or seismic data tied to well-controlled basement penetrations. As a result, attempts are often made to bridge this knowledge gap with generalizations or with unconstrained interpretations. For example, unconstrained seismic data can be a pitfall since an interpretation of a “basement” reflector may be later shown, on the basis of newer and better acquisition or processing, to have been based on an intra-sedimentary event. One way of avoiding this problem is to incorporate or integrate quantitative magnetic depth estimates into an interpretation which should then be properly called a magnetic basement interpretation.

Age, lithology, and stratigraphic position of rocks forming this magnetic basement are seldom well-known in the region studied. However, regional geologic comparative analysis can provide some useful information. The basement structure can be integrated with gravity, seismic velocities, geology and other geophysical data to develop a series of model-derived basin-wide maps. For example, many basin analyses, interpretations of a pre-Jurassic sediment isopach, total crust isopach (thickness of continental/upper crust), and lower crust isopach (thickness of oceanic/lower crust) are essential and are dependent on an initial basement interpretation.

The location, depth, and size of basement structures and faults are closely linked to the location and quantity of oil/gas reservoirs in a producing province.

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