Seismic Expression in Edge Enhancing Attribute to Resolve the Major Strike-Slip, Morris
Fault
Zone in Sumandak Cluster Field, Sabah Offshore Basin
Abstract
Sabah Offshore basin was formed during middle to late Miocene time concurrently with the opening of South China Sea. Related tectonic movement occurred both extensionally and compressionally and their features are associated with major fault
system. Morris
fault
is one of the major left lateral strike slip
fault
running in north-south direction which change to north-east direction in the northern part having hydrocarbon accumulating along the
fault
. Morris
fault
is associated with antithetic and synthetic
fault
system at shallow level. The
fault
pattern as well as the angle of plane changed with depth. It revealed the deformation of the area in NW-SW trending direction down to the basin followed by wrench induced features at the end of Miocene. Sumandak Cluster field is producing oil and gas in offshore Sabah with stratigraphic trapping type accumulation as a buried hill structure (remnant erosional structure) below transgressive marine shale of Intra IVC Uncomformity. It was initially understood that hydrocarbon accumulation of the field was not affected by the Morris
fault
. However, Sumandak Tepi discovery pointed out the accumulation is reflecting with Morris
fault
in term of trapping as well as migration from below and along the
fault
. Detail studies on Morris
fault
and its associated antithetic and synthetic faults were done in 2014 PSDM seismic data. It indicated all the cluster field of Sumandak had some relationship with the
fault
system of Morris. Expression of the Morris
fault
at different geological time are extracted from edge enhancing seismic cubes in this study
AAPG Datapages/Search and Discovery Article #90217 © 2015 International Conference & Exhibition, Melbourne, Australia, September 13-16, 2015