Analysis of induced microseismic events Analysis of induced - PowerPoint PPT Presentation

Analysis of induced microseismic events Analysis of induced microseismic events from HDR/EGS reservoirs by super from HDR/EGS reservoirs by super resolution mapping techniques resolution mapping techniques H. Asanuma*, Y. Kumano*, H. Niitsuma*, R. Baria**, D. Wyborn***, K. Tezuka**** *:Graduate School of Environmental Studies, Tohoku University, Japan **: MIL-TECH, UK ***: Geodynamics Ltd., Australia ****: JAPEX Research Center, Japan

Error in the mapping of microseismic events Error in the mapping of microseismic events Error (residual) in mapping - Uncertainty in velocity structure. - Error in phase picking Spatial distribution of error Mapping methods with higher Estimated reliability/resolution. location

MTC (more than cloud) mapping technologies MTC (more than cloud) mapping technologies 2600 2600 2600 2800 2800 2800 Depth(m) Depth(m) Depth(m) 3000 3000 3000 3200 3200 3200 3400 3400 3400 200 100 0 -100 -200 200 100 0 -100 -200 200 100 0 -100 -200 Along_N25W_direction(m) Along_N25W_direction(m) Along_N25W_direction(m) Original Collapsing Multiplet analysis JHD (1976) (Jones and Stewart 1995) (Moriya et. al, 1995) Standard Statistical Similarity of waveform optimization

Background of this study Background of this study “Multiplet” analysis (Moriya et al., BSSA, 2003) -Coherence-based analysis -Estimation of the orientation of fracture, stress, and pore pressure Multiplet analysis JHD Large CPU time and man-power (post-analysis)

Background of this study Background of this study “Collapsing” method (Jones and Stewart, 1995) - Statistical optimization of the seismic “cloud” -Implicit assumption of hypocenters on a point Statistical optimization Optimized location True location “Blurred” location (Collapsing) by error in velocity model or picking (JHD) Jones and Stewart, MTC Project report (1998) Difficulty in the interpretation of the “Collapsed” hypocenters

Concept of the Coherence Collapsing Concept of the Coherence Collapsing Relocation by the original Collapsing “Blurred” location by error in velocity model or picking (JHD) Relocation by the Coherence Collapsing

Concept of the DD (double differential) Concept of the DD (double differential) = − − − ij i j cal i j obs dr (t t ) (t t ) Precise differential k k k k k Station correction is canceled Monitoring station Identical path

Concept of the DD (double differential) Concept of the DD (double differential) DD Equation = − − − ij i j cal i j obj dr ( t t ) ( t t ) k k k k k * Link of events with higher similarity * Precise relative picking Super resolution mapping Super resolution mapping

Background of this study Background of this study The Coherence Collapsing The DD - Statistical optimization of the - Coherence analysis of seismic whole seismic cloud signals with higher similarity emphasizing the location of - Ability to delineate small-scale multiplets seismic structures which may be - Ability to delineate large-scale highly correlated to existing seismic structures fracture and stress state. - Absolute location - Relative timing and location - Small CPU-time (semi-realtime) - Large CPU-time (post analysis) S H S h

Application to the data set from Soultz Application to the data set from Soultz

Application to the data set from Soultz Application to the data set from Soultz

Application to the data set from Soultz Application to the data set from Soultz

Application to the data set from Soultz Application to the data set from Soultz

Application to the data set from Cooper Basin, Aus. Application to the data set from Cooper Basin, Aus. Darwin Nockatunga Cooper Basin Brisbane Hunter Valley Perth Sydney Adelaide Melbourne (Geodynamics Limited)

Application to the data set from Cooper Basin, Aus. Application to the data set from Cooper Basin, Aus. 2000 MW1 1000 Mcleod1 NS(m) 0 Habanero1 -1000 MW3 MW2 -2000 -2000 -1000 0 1000 2000 EW(m) 2000 2000 Habanero1 Habanero1 3000 3000 Depth(m) Depth(m) 4000 4000 5000 5000 6000 6000 2000 1000 0 -1000 -2000 -2000 -1000 0 1000 2000 EW(m) NS(m)

Application to the data set from Cooper Basin, Aus. Application to the data set from Cooper Basin, Aus.

Application to the data set from Cooper Basin, Aus. Application to the data set from Cooper Basin, Aus.

Application to the data set from Yufutsu gas field, JPN. Application to the data set from Yufutsu gas field, JPN. Akebono PS 3 LOW C.T. PS 3 Near UP Harumi Minami C.T. Far Yufutsu

Application to the data set from Yufutsu gas field, JPN. Application to the data set from Yufutsu gas field, JPN.

Application to the data set from Yufutsu gas field, JPN. Application to the data set from Yufutsu gas field, JPN.

Application to the data set from Yufutsu gas field, JPN. Application to the data set from Yufutsu gas field, JPN. JHD Coh-col DD

Problems to be solved Problems to be solved The Coherence Collapsing The DD - Optimization of the parameters - Error evaluation (weighting factor, definition of - Possible artifacts the error ellipsoid) - Determination of the absolute - “Over collapsing” location

The use of the super-resolution mapping techniques in the seismic monitoring of The use of the super-resolution mapping techniques in the seismic monitoring of HDR/EGS reservoirs HDR/EGS reservoirs Automatic Phase picking picking SEL (single -Outline of the event location) stimulated zone Realtime -Optimization of the (0-5 min.) JHD (joint hypocenter velocity model determination) -Spatial error -Large scale seismic Original Collapsing structure Coherence table Semi-realtime -Location of the (10-20 min.) Coherence Collapsing multiplet cluster -Structure of the Double differential multiplet cluster Post-analysis Further analysis (1-10 days) *Source mechanism *Magnitude *Stress state *Flow path …..

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