Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2014.1139.1146LatiffA.H. Abdul GhoshD.P. HarithZ.Z. Tuan JamaludinS.N.F. 1120141411This research aims at improving our understanding on seismic
data in shallow gas cloud region where subsurface image quality is generally
poor. The distorted images underneath gas zones usually contain precious information
of hydrocarbon accumulation. Previously, we analyze the different depths and
shallow gas concentration by using focal beam method as both factors contribute
to poor subsurface seismic image underneath the gas accumulation. Since those
analyses used only full 3D survey design which unrealistic, the objective of
this work is to compare full 3D illumination with industry standard 3D surveys
illumination and analyze the suitability of both design in shallow gas cloud
region. Standard 3D configuration contains single source line with four streamer
lines on either side of source line. At the beginning, a velocity model was
built with constant gas cloud velocity of 1400 m sec-1 to mimic the
real field data. Then analyses on differences from both survey designs will
be explained in term of resolution function and Amplitude Versus Ray Parameter
(AVP) imprint for various frequency content, namely at 5 (low frequency), 30
(center frequency) and 45 Hz (high frequency). We will demonstrate that by using
focal beam method for gas cloud image analysis, good images can be obtained
irrespective of sourcereceiver configuration, particularly in high frequency
content.]]>Abdul Latiff, A.H., D.P. Ghosh and Z.Z. Tuan Harith,20132013Van Veldhuizen, E.J.,20062006Van Veldhuizen, E.J., G. Blacquiere and A.J. Berkhout,200873Q43Q58Berkhout, A.J.,1980