UDOMoRe Depth plug-in Brochure - Ocean - Schlumberger

Empower Geophysics
UDOMoRe Depth (UDMD)
Ocean* Plug-in for Petrel* Geophysics
*Marks of Schlumberger
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Overview
UDMD helps Geophysicists to optimize and properly handle uncertainty on multi-layer vertical time
to depth conversion of seismic time / depth interpreted horizons
Assess
Assess and benchmark the accuracy of interval velocity models
underlying vertical time to depth conversion workflows
Optimize
Optimize the accuracy of interval velocity and depth models
Unify
Unify workflows with simultaneous computations of interval
velocity models, depth maps, uncertainty maps, GRV
expectation curves, P10/P50/P90 depth maps, closure
probability maps, remaining potential maps
Decide
Better support E&P operational decisions, such as acquisition
of assets, booking reserves, implementing new wells

UDMD Positioning in Petrel
Creating advantage to Petrel workflows that include the following
processes:
Make velocity model
General depth conversion
Uncertainty and optimization
Volume calculation
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Case study: creating advantage in Petrel with UDMD
Objectives: Depth map at H3 (target) + GRV expectation curve at H3
(target) + P10, P50, P90 depth cases
Time Interpretations in Petrel
Input
Horizon H1
Horizon H2
Horizon H3
Target
• 3 time interpreted horizons (H1, H2, H3)
• Set of depth markers at each horizon
• V0+KZ interval velocity laws between each horizon
• Velocity law parameters:
H1: V0 = 2050 m/s; K = 0,21
H2: V0 = 2050 m/s; K = 0,22
H3: V0 = 2050 m/s; K = 0,30
• Time picking uncertainty (1 sigma):
H1 = +/- 2 ms
H2 = +/- 2 ms
H3 = +/- 4 ms
• Local velocity residuals (variogram):
H1: sill = 20 m²/s²; range X= 500m; range Y= 1000m
H2: sill = 20 m²/s²; range X= 500m; range Y= 1000m
H3: sill = 100 m²/s²; range X= 500m; range Y= 1000m
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Case study: creating advantage in Petrel with UDMD
Most software solutions do not optimize interval velocity parameters
H1: V0 = 2050 m/s; K = 0,21
H2: V0 = 2050 m/s; K = 0,22
H3: V0 = 2050 m/s; K = 0,30
Depth map (H3)
Interval velocity (H3)
GRV curve (H3)
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Case study: creating advantage in Petrel with UDMD
Some software solutions optimize interval velocity parameters
H1: V0 = 2025 m/s; K = 0,21
H2: V0 = 1960 m/s; K = 0,23
H3: V0 = 1840 m/s; K = 0,38
Depth map (H3)
Interval velocity (H3)
GRV curve (H3)
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Case study: creating advantage in Petrel with UDMD
UDMD optimises + handles uncertainty on interval velocity law parameters
H1: V0 = 2025 m/s (+/- 130 m/s); K = 0,21 (+/- 0,14)
H2: V0 = 1960 m/s (+/- 175 m/s); K = 0,23 (+/- 0,10)
H3: V0 = 1840 m/s (+/- 440 m/s); K = 0,38 (+/- 0,18)
Depth map (H3)
Interval velocity (H3)
GRV curve (H3)
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Case study: creating advantage in Petrel with UDMD
Optimizing P90
Optimizing P50
Most software
solutions
Some software
solutions
UDOMoRe Depth
Optimizing P10
Advantage: technical lead for existing Petrel solutions
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Creating advantage thanks to powerful technology…
UDMD is based on a robust mathematical framework
Unique application of bayesian kriging (as developed by Omre / Abrahamsen),
applied to integrating geophysical + well data in the context of time to depth
conversion
Seisquare added value: applying bayesian kriging to non-linear geophysical
velocity laws (V0,k) in the context of time to depth conversion
UDMD translates deterministic time to depth conversion workflows
into stochastic ones, enabling:
« Best estimations » of optimal interval velocity model parameters
« Best estimations » of optimal depth conversion outputs
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… nicely integrated in Petrel
Input from Petrel
Time interpretation & well depth markers considered for TDC
Velocity laws (parametric) or seismic interval velocities corresponding to the
layers considered for TDC
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UDMD advantages delivered in Petrel
Assessment of interval velocity and depth models
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UDMD advantages delivered in Petrel
Optimization of interval velocity and depth models
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UDMD advantages delivered in Petrel
Reliable gross rock volume depth maps
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UDMD advantages delivered in Petrel
Reliable gross rock volume expectation curves
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UDMD advantages delivered in Petrel
Reliable well implementation
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Services
Consultancy services (studies)
Dedicated centers (workflow optimization)
Software
UDOMoRe Depth Petrel Plug-in
Available on Schlumberger’s Ocean Store
www.ocean.slb.com
References
Who to contact?
François Mérer, sales manager
Direct Line : +33 (0)1 78 77 10 22
Switchboard :+33 (0)1 78 77 10 21
francois.merer@seisquare.com
www.seisquare.com
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