Seismic Coring

Seismic coring obtained its name from the fact that it reassembles the core of the earth (which is the source) and the different layers surrounding the core (receiver lines). Another reason is because it produces data in the form of a cylinder which simulates a core sample from earth. One of the main objectives of any seismic survey is to allocate faults, anticlines, dipping beds etc, by using seismic 2-D lines, the actual fault throw and dip angle of a dipping bed will be apparent values unless the seismic line is perpendicular on them. By using a circular geophone spread with different radii, this will ensure that the geophones present on every circle to record the same arrival time leading to accurate and precise determination of the fault throw and the dip angle of a dipping bed. The resulting data would therefore have an advantage over 2-D seismic lines in the accuracy of determining fault throw and dip angle of dipping beds. two types of sources: 1-Explosive sources: for fast 3-D mapping of subsurface structures especially circular structures. 2-Vibroseis: for detailed 3-D mapping of circular structures such as salt domes and folds.