TY  - JOUR
T1  - Application of Seismic Attribute and Spectral Decomposition: Example of
Fluvial System During Miocene in Field A, Malay Basin
AU - Malik, Muhammad Hazmi Abdul AU - Zung, Lo Shyh 
JO  - Journal of Engineering and Applied Sciences
VL  - 14
IS  - 4
SP  - 1110
EP  - 1121
PY  - 2019
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2019.1110.1121
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2019.1110.1121
KW  - Facies analysis
KW  -spectral decomposition
KW  -stratigraphic traps
KW  -instantaneous frequency
KW  -STFT
KW  -RGB
AB  - Stratigraphic channels in field A Malay Basin including those with reservoir potential have been
defined seismically. There were two exploration wells in field a however, the wells were abandoned due to low
structural relief and volume were below economic criteria. This study discusses how seismic attribute and
spectral decomposition give geomorphological information in different stratigraphic levels of Miocene age at
Top F, H, I, Group I-50 and I-60. Facies analysis, seismic attribute, spectral decomposition and colour blending
were implemented to identify hydrocarbon potential in stratigraphic traps and to enhance seismic resolution.
Channel anomalies can be identified in seismic reflections characterized by high-amplitude events with chaotic
reflections. Numerous sub-parallel reflection with high amplitude is observed in the upper formation. Several
seismic attributes were used from the 3D seismic dataset to identify the geomorphologic features, potential
reservoir variations, besides distribution and to extract the anomalies. Physical attributes which are related to
amplitude, frequency, phase and their derivative were used including variance, instantaneous frequency,
sweetness and spectral decomposition. Sweetness is the combination of lateral continuity and reflection
strength. High reflection strength indicates maximum amplitude of the largest peak or through of real trace. This
is especially, true when an event is a composite reflection. Amplitude attribute provides better spatial definition
of events and bright spots could be enhanced. Instantaneous frequency shows composite frequency of the
individual reflections contributing to a particular reflector. This composite is a useful correlation tool. Rapid
changes in frequency are sometimes indicator of pinchouts such as oil/gas and water contacts. Low frequency
anomalies are observed in zones below hydrocarbon reservoirs. Meanwhile, instantaneous phase is useful in
stratigraphic analysis of certain sections because the sharp zero crossings that results may emphasize lateral
discontinuities, pinchouts and angularities. The combination of attribute analysis and spectral decomposition
aids the interpretation and identification of some channel patterns and channel distribution. Two methods
of spectral decomposition are used Short Time Fourier Transform (STFT) and S-transform which focus
on spatial and temporal range, respectively. Red Green Blue (RGB) colour blending represents different
frequency ranges of low, mid and high frequency bands and display as a single image. This method reveals
additional information such as depositional elements, anomaly identification, bed thickness, presence of fluids
and help to resolve petrophysical heterogeneity. This study reveals that there are strong evidences of
hydrocarbon potential in stratigraphic traps for further exploration within the study area.
ER  -