PROVIDING SEISMIC ENERGY IMPULSES TRANSMITTED

Brand	Owner	Address	Description
BOLT	BOLT TECHNOLOGY CORPORATION	Four Duke Place Norwalk CT 06854	Providing Seismic Energy Impulses Transmitted into the Earth Near the Mouth of a Well for Carrying out Well Velocity Surveys and Vertical Seismic Profile Surveys;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A method of determining seismic properties of a layer of the seabed, in particular a surface or near-surface layer (5), comprises directing seismic energy propagating in a first mode at a boundary face of the layer so as to cause partial mode conversion of the seismic energy at the boundary face. For example partial mode conversion may occur when seismic energy propagates upwards through the interface between a surface or near-surface layer (5) and the basement (6), owing to the difference in seismic properties between the surface or near-surface layer (5) and the basement (6). In the invention, the two modes of seismic energy-that is the initial mode and the mode generated by mode conversions at the interface-are received at a receiver. The difference in travel time of the two modes between the interface and the receiver is determined from the seismic data acquired by the receiver.