application of low frequency passive seismic method for hydrocarbon detection in s field, south...
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The Energy Company of Choice
Application of Low Frequency Passive Seismic Method for Hydrocarbon
Detection in S Field, South Sumatra Basin
Andika Perbawa, Danar Yudhatama, M. Aidil ArhamPT. Medco E&P Indonesia
• Introduction
• Data and Method• Result and
Discussion• Conclusions
Today’s
TalkPassive Seismic
Method
• Case Studies• Objective
s
• Passive Seismic Method (PSM) is a geophysical method that utilizes a spectral frequency from seismicity data to identify a subsurface fluid behavior/direct hydrocarbon indicator (Holzner et al., 2005; Akrawi and Bloch, 2006; Suntsov et al., 2006)
• When the seismicity is propagating through a reservoir which contains hydrocarbon, empirically it will amplify the amplitude of low frequency between 1-6 Hz (Dangel, et al., 2003) or 1-4 Hz (Hardage, 2008) or 2-4 Hz (Suryanto, 2008). It also called as spectral modification.
What is Passive Seismic Low Frequency Anomaly ?
Introduction
(Alwi, 2011)
Possible causes of spectral modifications (Suntsov, et al., 2006) :•Attenuation phenomena in poro-elastic media•Subsurface reflection patterns•Resonant amplification due to oscillations •Phase transition effects
Working Hypotheses
Introduction
Resonant AmplificationCertain frequencies of incoming waves are amplified due to an oscillation process at the pore scale
Resonant ScatteringIncoming waves are reflected at the surface and the reservoir due to heterogeneities
Overseas Field Cases
Case Studies
Portiguar Basin, Brazil, 2004Voiitsdorf Area, Austria, 2005
Voiitsdorf Area, Austria, 2005
Dangel et al., 2003
Jordan Italy
Ukraine Morocco
Burgos Basin, Mexico, 2006
(Frehner, et. al., 2007)
• Passive seismic survey conducted over Tanggulangin oil and gas field
• Passive Seismic method is proven to show positive relationship between amplitude frequency and hydrocarbon accumulation (Alwi , et.al., 2011)
Indonesia Field Case
Case Studies
Objectives
To test the feasibility of low frequency passive seismic method around “S” field
To classify and rank prospect G and lead K nearby “S” Field
Passive Seismic Data Point
Total data points: 18
Data and Method
0 2 Km
Composite Seismic Line
Data and Method
P-1 S-1 S-2S-3 S-4 R-1GF-1K
0 2 KmTop Baturaja LimestoneTop Basement
• Dig a hole to around 30-50 cm• Insert three special iron rods for placing the seismometer• Orient the seismometer to magnetic north• Connect the seismometer to the data logger, GPS, and laptop• Record the seismicity data for 30 minutes• Copy data from data logger to USB flash-disk, then copy to laptop for further
analysis
Survey Acquisition
Data and Method
Processing Workflow
Data and Method
Data Processing
Data and Method
CWT
Data and Method: Data Processing
0 1 2 3 4 5 6 7 8 9 100
0.01
0.02
0.03
0.04
0.05
0.06Amplitude Spectrum of U-D(t)
Frequency (Hz)
|Z(f)
|
0 1 2 3 4 5 6 7 8 9 100
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1Amplitude Spectrum of U-D(t)
Frequency (Hz)
|Z(f)
|
Window
1
Window
2
Window
3
Normalized am
plitudeNorm
alized amplitude
Normalized am
plitudeFFT
Smoothing
FFT
Smoothing
FFT
Smoothing
Frequency Spectrum Up-Down (UD) Frequency Spectrum Up-Down (UD)
Frequency Spectrum Up-Down (UD) Frequency Spectrum Up-Down (UD)
Frequency Spectrum Up-Down (UD) Frequency Spectrum Up-Down (UD)
Bubble Map of Amplitude Frequency 2-4 Hz for Vertical component (UD) for all data points
Result
Result and Discussion
Window 1
Window 3
Window 2
Result and DiscussionAverage Amplitude of Frequency Between 2-4 Hz (UD)
0 2 Km
Result and DiscussionAverage Amplitude of Frequency 2-4 Hz
0.017 0.021 0.031 0.038
Gas Zone
Oil Zone ?Gas
ZoneOil Zone
Result and DiscussionAverage Amplitude of Frequency 2-4 Hz
0.017 0.021 0.031 0.038
Basement
Well to Amplitude Correlation Analysis
Result and Discussion
Point Vertical Amplitude Well Status
S-1 0.017 Dry HoleS-2 0.021 GasS-3 0.031 Oil
S-4 0.038P&A well with no
testing but possible oil accumulation
G 0.041 ProspectK 0.010 Lead
Average Amplitude of Frequency Between 2-4 Hz
Prospect and Lead Ranking
Result and Discussion
1. Four locations have a relatively higher amplitude (>0.021) frequency between 2-4 Hz: S-2, S-3, S-4 and prospect G while S-1 and lead K shows a relatively small amplitude frequency (<0.017)
2. Passive seismic confirms that low amplitude frequency in S-1 corresponds with no hydrocarbon accumulation while a high amplitude frequency in S-2 and S-3 corresponds with hydrocarbon accumulation in S field
3. S-4 shows a high amplitude of low frequency which is justified by 60 feet of limestone reservoir above oil-water contact. It is possible that the zone is filled with oil
4. Prospect G shows a high amplitude frequency similar with S-3 which indicates high possibility of hydrocarbon accumulation in Prospect G
5. Lead K shows a low amplitude frequency similar with S-1, which indicates low possibility of hydrocarbon accumulation in Lead K
6. Passive seismic method is successfully applicable for identifying hydrocarbon accumulation in the subsurface
Conclusions
Alwi, M., Praptono, S.H., Murtadho., 2011, Low Frequency Passive Seismic Study In Brantas Block, East Java, Indonesia. IPA Proceeding. JakartaBloch, G. and Akrawi, K., 2006, Application of Low Frequency Passive Seismic Surveys in ADCO, UAE. EAGE Workshop Passive Seismic, December 10-13, Dubai, Uni Arab EmiratesDangel, S., M. E. Schaepman, E. P. Stoll, R. Carniel, O. Barzandji, E.-D. Rode, and J. M. Singer, 2003, Phenomenology of tremor-like signals ob-served over hydrocarbon reservoirs. Journal of Volcanology and Geother-mal Research,128, 135–158.Frehner, M., Schmalholz, S., Podladchikov, Y., Holzner, R., 2007, Low Frequency Modification of
Seismic Background Noise Due to Interaction With Oscillationg fluids in Prorous Rocks. EAGE.Hardrage, B., 2008, Passive Seismic Techniques, Search and Discovery Articles #40319.Holzner, R., Eschle, P., Zurcher, H., Lambert, M., Graf, R., Dangel, S. and Meier, P. F., 2005, Applying microtremor analysis to identify hydrocarbon reservoirs. first break, 23, 41-46Suntsov, A.E., Aroutunov, S.L., Mekhin, A.M. and Meltchouk, B.Y., 2006, Passive Infra-Frequency Microseismic Technology-Experience and Problems of Practical Use:
EAGE Workshop Passive Seismic, December 10-13, Dubai, United Arab EmiratesSuryanto, W., Wahyudi., 2008, Monitoring Mikroseismik Untuk Deteksi Langsung Keberadaan
Hidrokarbon. PIT HAGI 2008. Bandung.
References
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