DEVELOPMENT OF TRANSMITTER FOR SEABED LOGGING (SBL) IN REAL AND SCALED ENVIRONMENT

Electromagnetic (EM) technology called Seabed Logging (SBL) has recently
been used for hydrocarbon exploration. Seabed logging (SBL) is an application
of marine controlled source electromagnetic (CSEM) method which is used to
detect the location of oil reservoir. A recently developed transmitter IS usmg
Horizontal Electric Dipole (HED) transmitter 1=1 on electromagnetic (EM)
surveying technique. The technique has proven particularly useful for detecting
thin and highly resistive layers of hydrocarbon reservoirs. However, to detect the
hydrocarbon reservoirs at very deep seawater still remains a challenge. There are many
limitations of the conventional HED transmitter in terms of depth penetration for deep
target (~2.5km). This project has come out to further improve the current design of
transmitter that can penetrate more below the seafloor. This project consists of simulation
and modeling the prototype of EM antenna. Aluminum is the best material to this design since
it is easy to fabricate, light, cheaper than copper and has high resistive corrosion. The shape of half
ring antenna gives greatest improvement on the amplification of 102.19% as compared to
the straight shape and 20.66% compared to ring shape. Further improvement to the current
design was done by combining four half ring antennas which is called Quadrapole antenna.
The Quadrapole antenna with parallel connection and feeding points at the center gives
percentage difference of 196.77.88%. The combination of magnetic feeders and
Quadrapole antenna enhance the output of EM wave with 445.76% increment compared
to the Quadrapole antenna without magnetic feeders.