Chevron GOM Full Waveform Inversion Synthetics


2D Elastic Isotropic (Vp, Vs, Dn) marine seismic benchmark synthetic, subsalt Gulf of Mexico. 80 km long, 15 km deep, 20 km streamer offsets, with or without free surface multiples, wavelet provided, and featuring current geological and structural understanding of this province. Its main purpose is to exercise FWI algorithms in their quest for complex salt shapes and subsalt velocity anomalies, thus the long offsets and absence of anisotropy, which would make an already difficult problem even more so. Used for both the 2012 and 2013 SEG Gulf of Mexico Imaging Challenge Workshops.

The 2012 SEG post convention workshop "Gulf of Mexico Imaging Challenges: What can full waveform inversion achieve?" included a morning session where participants shared the results of a blind GOM synthetic FWI exercise. Participants were invited to show their velocity estimates and images. Link to workshop description.

An SEG post convention workshop "Gulf of Mexico Imaging challenge Part II: FWI, WEMVA, and Workflows" is planned for 2013. Link to workshop description. Workshop participants are invited again to present inversion results.

Based on feedback from past participants, advances in acquisition technology, and feedback at the 2013 EAGE pre-convention FWI workshop a synthetic with 30 km offset and 23 second recording time was created. This dataset is called the 2013 Chevron long offset FWI synthetic.

In August of 2013, a starting Vp model to assist FWI inversion was provided in segy and a binary flat file.

In August of 2013 Chevron also distributed CSEM and MT data computed from the same model for participants who desire EM data.

In April of 2014 Chevron distributed a new model for the 2014 FWI SEG workshop.

Data for these workshops are distributed with the data license agreements attached to each distribution. These licences are very similar to the following licence.

DATA LICENSE AGREEMENT

Do not separate this Data License Agreement from this Data. Make sure you read and understand this document fully.

Subject to the terms and conditions below, Chevron hereby extends to you ("User") a limited, non-exclusive, non-transferable, revocable, royalty-free license ("License") to use Chevron's 2D Synthetic Seismic Dataset, including all data and supporting information related to the 2D Synthetic Seismic Dataset, such as without limitation, synthetic gravity data and electromagnetic data (collectively, "Data")

1. SEG. The SEG is helping to distribute this Data, but is not legally liable in any way because of that assistance.

2. NO WARRANTIES. THE DATA IS PROVIDED "AS IS," WITH NO WARRANTY OF ANY KIND. CHEVRON MAKES NO REPRESENTATIONS OR WARRANTIES TO USER, EXPRESS, IMPLIED OR STATUTORY, INCLUDING ANY IMPLIED WARRANTIES OF FITNESS OR FOR A PARTICULAR PURPOSE.

3. DAMAGE WAIVER. CHEVRON SHALL NOT BE LIABLE FOR ANY DAMAGES OF ANY KIND, INCLUDING PERSONAL INJURY, PROPERTY DAMAGE AND CONSEQUENTIAL DAMAGES, WHICH MAY ARISE IN CONNECTION WITH THIS LICENSE OR USER'S USE OF THE DATA OR RESULTS.

4. MODIFICATIONS. If User modifies this Data in any way, User must document that the data has been modified from its original form and explain how it differs from the original Data.

5. REDISTRIBUTION. If user agrees to disclose any or all of this Data with any other person or organization, user will also provide all of the associated documentation originally included with the Data and provided to user, including this Data License Agreement. If User discloses any modified version of Data, the modification must be documented and included along with the Data.

6. PUBLICATIONS. User agrees to acknowledge Chevron for use of the Data in any proposed publications, presentations or other materials that include the Data.

7. VOLUNTARY USE. Use of the Data is voluntary. Chevron will not compensate User in any way for processing, analyzing, modifying, distributing or otherwise using the Data.

By using the Data, User hereby accepts the above terms and conditions of this License. If User cannot agree with the above terms and conditions, User cannot use this Data.




Download Instructions:


These data are on a disc circulating in Houston. Contact me if you would like to borrow the disk. My contact information is at the bottom of the web page.

The 2012 datasets are approximately 25 gbyte each. They are seperated into three parts (each 8 gbytes) for downloading. You can mouse click left to download the files to the download directory, or use the right mouse button to select another directory to download into.

Data without free surface multiples

Download with these links.

Move these files into a directory you want to uncompress and untar and run:
cat ChevronGOM_2012_Benchmark_no_FSM.gzip.part? | tar -xvz

Data with free surface multiples

Download with these links.

Move these files into a directory you want to uncompress and untar and run:
cat ChevronGOM_2012_Benchmark_w_FSM.gzip.part? | tar -xvz

2013 Chevron long offset FWI synthetic

These data are about 80 gbytes. It is broken into 8 parts of about 10 gbytes each. Using the right mouse would be a good idea. These files take about 12 hours to download using my home internet service. In August 2013 there was a usb disc circulating in Houston. Contact me if you are interested in being added to the circulation.

Move these files into a directory you want to uncompress and untar and run:
cat ChevGOMLO.tar.gzip.parta? | tar -xvz

2013 Chevron anisotropic FWI synthetic with tilted transverse isotropy (tti)

These data are about 29 gbytes. It is broken into 6 parts of about 5 gbytes each. Using the right mouse would be a good idea. These files take about 4 hours to download using my home internet service. If you are in Houston and you would like a copy on a usb drive, contact me. My contact information is at the end of this web page. If you are not in Houston and would like a copy on a usb drive , contact me and we can discuss.

You can download these data with bittorrent, if you install that software on your computer. This is an excellent idea if a group of people all want to download the data at the same time. Many organizations do not allow bittorrent because the software has been used abusively to transfer excessive ammounts of data. There are links below to download without bittorrent. I am interested in your input on bittorrent. Please email me at k_schleicher@hotmail.com.

Links for bittorrent downloads:
Links for conventional downloads:

Move these files into a directory you want to uncompress and untar and run:
cat ChevronGOM2013_tti.tar.parta? | tar -xvz

Starting velocity model

There is a 199,772,804 byte binary flat file, as well as a 204,768,644 byte segy file. The binary file is IEEE floats.

Nx = 20801 Nz = 2401 dx=dz=6.25 m (X0,Z0) = (0.,0.)

Binary flat file is Little Endian, X is the fast axis.

CSEM and MT data (aka EM data)

CSEM and MT data from the Chevron model, for those participants who desire EM data as well. The tar file contains one directory named bench_csemmt_aug13, and this directory contains: A new data license geared toward potential data (not just seismic), a technical readme file, and 5+ Mb of data.


SEG2014 Workshop

2D MARINE ISOTROPIC ELASTIC SYNTHETIC SEISMIC BENCHMARK

April 2014

Package contains:
This Readme file
One SEGY seismic data file: SEG14.Pisoelastic.segy: 4,234,122,000 bytes (dX = 25 m)
after compression SEG14.Pisoelastic.segy.gz is 3774533238 bytes
One SEGY smooth starting velocity file: SEG14.Vpsmoothstarting.segy (dX = 12.5 m)
One Vp well log 1000 < Depth < 2450 m: SEG14.Vplog (dZ = 5 m)
One farfield wholespace (no ghost) wavelet file: Wavelet.txt (0.666666 ms sampling)
One picture of the wavelet and the well log: WellWavePic.JPG
Legal Disclaimer (ascii)

General Information:
1600 shots: dS = 25 m, Source depth = 15 m
321 hydrophone recs/shot: dR = 25 m, Recevr depth = 15 m
Max offset = 8000 m
Record time = 8.0 s, sample rate 4 ms
Vp water = constant = 1510 m/s
With free surface multiples present in the data
Isotropic Elastic

Questions to: Joe Stefani joestefani@chevron.com

You can download these data with bittorrent, if you install that software on your computer. This is an excellent idea if a group of people all want to download the data at the same time. Many organizations do not allow bittorrent because the software has been used abusively to transfer excessive ammounts of data. There are links below to download without bittorrent. I am interested in your input on bittorrent. Please email me at k_schleicher@hotmail.com.

Links for bittorrent downloads:
Links for conventional downloads:

Move these files into a directory you want to uncompress and untar and run:
cat seg_workshop_fwi_2014.tar.gz.parta? | tar -xvz

wget commands to download, cat, and tar the files.

You can download from the command line in a terminal using wget. This was much faster on some tests. The commands are:
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevronGOM_2012_Benchmark_no_FSM.gzip.part0
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevronGOM_2012_Benchmark_no_FSM.gzip.part1
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevronGOM_2012_Benchmark_no_FSM.gzip.part2
cat ChevronGOM_2012_Benchmark_no_FSM.gzip.part? | tar -xvz

wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevronGOM_2012_Benchmark_w_FSM.gzip.part0
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevronGOM_2012_Benchmark_w_FSM.gzip.part1
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevronGOM_2012_Benchmark_w_FSM.gzip.part2
cat ChevronGOM_2012_Benchmark_w_FSM.gzip.part? | tar -xvz

wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_long_offset2013/ChevGOMLO.tar.gzip.partaa
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_long_offset2013/ChevGOMLO.tar.gzip.partab
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_long_offset2013/ChevGOMLO.tar.gzip.partac
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_long_offset2013/ChevGOMLO.tar.gzip.partad
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_long_offset2013/ChevGOMLO.tar.gzip.partae
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_long_offset2013/ChevGOMLO.tar.gzip.partaf
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_long_offset2013/ChevGOMLO.tar.gzip.partag
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_long_offset2013/ChevGOMLO.tar.gzip.partah
cat ChevGOMLO.tar.gzip.parta? | tar -xvz

wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_tti/ChevronGOM2013_tti.tar.partaa
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_tti/ChevronGOM2013_tti.tar.partab
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_tti/ChevronGOM2013_tti.tar.partac
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_tti/ChevronGOM2013_tti.tar.partad
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_tti/ChevronGOM2013_tti.tar.partae
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_tti/ChevronGOM2013_tti.tar.partaf
cat ChevronGOM2013_tti.tar.parta? | tar -xvz

wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevronFWI-StartingModel.segy
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevronFWI-StartingModel.bin

wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi/ChevGOM_CSEMMT.tar
tar -xvf ChevGOM_CSEMMT.tar

wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/README
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/SEG14.Pisoelastic.segy.gz
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/SEG14.Vpsmoothstarting.segy
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/SEG14.Vplog
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/Wavelet.txt
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/WellWavePic.JPG
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/DataLicenseAgreement

wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/seg_workshop_fwi_2014.tar.gz.partaa
wget http://s3.amazonaws.com/open.source.geoscience/open_data/seg_workshop_fwi_2014/seg_workshop_fwi_2014.tar.gz.partab
cat seg_workshop_fwi_2014.tar.gz.parta? | tar -xvz

For comments or help with this distribution please contact me.

Regards,

Karl Schleicher
Senior Research Fellow
Bureau of Economic Geology
University of Texas at Austin
k_schleicher@hotmail.com
281 701 9032