PETREL INTRODUCTION G&G SCHLUMBERGER

Objective Data Interpretation and Analysis using Petrel – 2D Seismic data visualization and interpretation – Interpretation of structure (e.g. faults) – Stratigraphic correlation – Velocity modeling Materials (Courtesy: 2011 IBA team University of Alabama) 13,385 km2 study area 15 2-D time migrated seismic lines (1981 vintage) 7 wells (2 TD in basement) Well seismic ties >32 km

Petrel Key Benefits 3D visualization Well correlation Classification and Estimation (Artificial Neural Net) Creation of synthetic seismograms Seismic attributes Geobody Interpretation 2D & 3D seismic interpretation and modeling Seismic volume rendering and extraction 3D mapping 3D grid modeling for geology and reservoir simulation Velocity Modeling (Domain Conversion) Well log upscaling Facies Modeling Petrophysical Modeling Data Analysis Uncertainty Analysis Optimization Workflow editor Fracture Modeling Volume Calculation 3D well design Streamline simulation ECLIPSE Simulation Simulation post-processing Remote Simulation Run submission Plotting

Explorer Panes

Explorer Panes

Project Coordinate System File  New Project

Select Project Coordinate System Helpful website to get an overview on Geodetic Datum http://www.colorado.edu/geography/gcraft/notes/datum/datum_f.html

Import Seismic Data

Import Seismic Data

Import Base Map Bitmaps (bmp, jpg, tiff) can be imported and visualized in Map Window Save a map from Google Earth Insert new folder in the input pane  Rename as map  Right click  Import on Selection Right click on the image Settings Settings input Lat-Long data

Import Well Logs

Import Well Logs (3 steps) 1. Well head An ASCII file (EXCEL file saved as .txt-tab dilimited) must be created with following required attributes Well Name X coordinate Y coordinate Kelly Bushing (Elevation datum) Bottom Depth TD (True vertical Depth)

Depth Reference/Depth Datum Objective Q/A Search “Schlumberger Oilfield Glossary” in Google website : http://www.glossary.oilfield.slb.com/default.cfm Search for following terminologies a. Depth Reference or Depth Datum b. Kelly Bushing c. Rig Floor d. Measured Depth e. True Vertical Depth Figure Courtesy http://www.cdc.gov/niosh/face/stateface/ok/03ok034.html

Import Well path/deviation

Import Well Logs

Seismic Data Visualization Right click on seismic line  Create Interpretation Window The seismic interpretation window gives you a classic 2D view of the seismic data. Inline, crossline, composite lines and any type of random lines, can be displayed in the interpretation window. All interpretation tools are available in this window and the view can be zoomed, stretched and squeezed in either direction.

Seismic Data Visualization: Composite Lines <--Start new composite line to draw more than one composite lines

Seismic Data Visualization: Composite Lines 1. Check following seismic lines 1981 D-81_Amplitude, 1981 B-81_Amplitude, 1981 A-81_Amplitude, 1981 27-81_Amplitude, 1981 16-81_Amplitude 2. Select orthogonal view 3. Select composite section 4. Select the lines to be added into the composite section (become bold white), double click when you are done with adding lines 5. Composite folder will be created automatically in the input pane 2 3 4 5

Seismic Data Visualization: Convert to 2D seismic line

Seismic Data Interpretation

Horizon picking Right click on 1981 27-81_Amplitudes  Create interpretation window Insert  New folder  Right click Insert seismic horizon New horizon will be added “Seisimic Horizon 1” and be activated (bold)  Click on  choose from the following options Interpret Grid Horizons [H] Seeded 3D autotracking [Shift +A] Guided autotracking [G] Manual interpretation [U] Seeded 2D autotracking [A]

Fault picking Two ways to interpret faults: Classical interpretation (drawing fault segments) in the seismic interpretation - flexibility of traditional interpretation - clarity of fault planes triangulated in 3D Fault modeling directly on the seismic in 3D process - ready for gridding as soon as the interpretation is complete. - interpreter is forced to solve problems regarding fault hierarchy and connections - no need for reinterpretation before fault modeling