Well Ties

19 July 2024

Cost: $5,000.00 - $250,000.00

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Message Applied Geoscience

Description of Service

DEPTH & TWT DOMAIN WELL TIES

Tying seismic data to well control is a crucial step in seismic inversion and interpretation.

Applied Geoscience matched synthetic to wells in Depth to avoid stretch and squeeze in logs.

Applied Geoscience typical workflow in TWT

Data preparation
- Import the seismic volume
- Extract a deterministic, statistical, or ricker
- Import the wells: Each well requires a track, checkshot or time-depth curve, and sonic log.
- Import the additional data: 3D/2D Horizons, well markers, additional time-depth curve if a checkshot was loaded.
- Edit the log database: Fill in the missing sonic parts, create a density log from the sonic (constant value or Gardner’s equation) if not available.
Synthetic-to-seismic tie
- Based on the available data the density and sonic logs will be combined into impedance and reflectivity, depth-time converted (includes an upscaling), and convolved with the wavelet. The result is synthetic seismic traces for the well. This trace will be compared with a composite seismic trace extracted in the volume along the (deviated) well path, on the nearest trace. Both synthetic and composite seismic traces are cross-correlated, and the output value is an indication of the alignment and matching quality.
- The alignment will be carried out either by shifting the synthetic trace up or down or by selecting several locations in both seismic traces, specifying and applying a shift function that varies with the travel time. The applied changes must be validated, before being converted into a new time-depth function that replaces the previous one. No changes are being applied to the well logs.
- At each step of the tie, a deterministic wavelet can be estimated using the time-converted reflectivity log and the composite seismic trace. This deterministic wavelet should vary per well and is known to link the well data to the seismic data more reliably.

What You Will Get From Purchasing This Professional Service. Deliverables

Well Ties Services

Duration To Complete Service. How Long Before Service Is Completed

1-8 weeks

About Applied Geoscience

Applied Geoscience is a privately owned Sub-Surface Company (AGP) that specializes in seismic processing, velocity modelling, depth conversion & Seismic Uncertainty Evaluation. HQ of AGP is in Perth, Australia with partnerships with leading companies in Calgary, KL, USA & UK.

Areas of expertise include regional & field-scale data integration, seismic and well data interpretation & geophysical support for field development & drilling.

Skills and Expertise

Upstream Oil & Gas
Sales, Marketing, Business Development Core Analysis Production Support Activities Operations Services Geomechanics Reservoir Completions Drilling Geology Geophysics Petrophysics Simulation Well Testing Coiled Tubing Log Analysis Formation Evaluation Enhanced Oil Recovery (EOR) Hydraulic Fracking Artificial Lift Wireline Data Mud logging Project Management