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Teal South, Gulf of Mexico, Time-lapse Datasets

Why Teal South?

First, the Teal South datasets are interesting. The P-wave datasets can be (have been) used to study AVO and pressure changes over time in this producing field. Second, because they are small datasets (around 2.5 GB for the C-wave gathers to around 5.5 GB for the P-wave gathers), the phase 1 and phase 2 datasets are computationally cheap to study time-lapse changes.

 

Some history

The Teal South field is in the Gulf of Mexico, about 80 miles offshore, in Eugene Island Block 354.

In 1995, Texaco conducted a streamer survey (PP-waves only) in Teal South. This survey was done before production started in the Teal South field. The streamer data, which are not included here, are called the Legacy data.

In July 1997, Texaco conducted an ocean-bottom cable (OBC), 4-component survey. (Four-component recording means each ocean-bottom receiver position has an inline geophone, a crossline geophone, a vertical geophone, and a hydrophone, all in one package.) The July 1997 survey is called Phase 1. At the time of this survey, the 4500 ft sand had been in production for over eight months (Ebrom et al., 1998).

In late 1997, Texaco turned control of the project over to the Energy Research Clearing House (ERCH).

In April 1999 (21 months after Phase 1), ERCH completed another OBC, 4-component survey, Phase 2. The ERCH did its best to use the original positions of the four east-west cables, it added three north-south cables, and extended source positions to the east.

Teal South acquisition geometry for Phase 1 and Phase 2

 

Useful documents

Click here to download a zip bundle of documents about the Teal South field. Of course, pay particular attention to any document with "Teal South" in the title.

  1. Without modesty, I suggest you start your reading with the paper I wrote for people who come to this page, SeismicRocks_2024_TealSouth.pdf. It is an introduction to the Teal South geographic setting and data acquisition, the steps the CGG contractors used to process these datasets, and an appendix of P-P and P-S stacking velocities.
  2. Second, I suggest TLE_1998-10_Ebrom_4C-4D-TealSouth.pdf. It is a quick look at phase 1 acquisition and the data, both P-waves and C-waves.
  3. Third, I suggest TLE_2001-10_Pennington_SeismicTimeLapseSurpriseAtTealSouth.pdf. It is an amplitude and pressure interpretation of the P-wave time-lapse data. I think it is worth your time to study it.

 

Acknowledgment

These datasets are available to us because of the generosity of Gene W. Sparkman and the Energy Research Clearing House.

 

Primary seismic datasets — SEG-Y, big endian format

The primary seismic datasets are the P-P common midpoint (CMP) gathers and the P-S common conversion point (CCP) gathers after processing by CGG. (Refer to SeismicRocks_2024_TealSouth.pdf for CGG processing steps.)

Reel ID
Size
File ID
Phase -- Wave Type
Description
Download
104544
2.8 GB
104544
phase1-pz
CMPs
Download
104546
3.3 GB
104546
phase2-pz-1
CMPs
Download
104547
2.2 GB
104547
phase2-pz-2
CMPs
Download
 
 
 
 
 
 
103685
2.2 GB
103685
phase1-c1
CCPs
Download
103686
2.2 GB
103686
phase1-c2
CCPs
Download
103687
4.2 GB
103687
phase2-c1
CCPs
Download
103688
4.2 GB
103688
phase2-c2
CCPs
Download

Note: Two datasets above, phase2-pz-1 and phase2-pz-2 are actually one dataset — they should be combined to become the phase 2 PZ data. These are two files because, unfortunately, they were originally on two Exabyte 8mm tapes; all of the phase 2 PZ dataset could not fit on one Exabyte tape.

 

Secondary seismic datasets — SEG-Y, big endian format

The secondary seismic datasets are small files, products of processing the CMPs and CCPs of the primary datasets.

Reel ID
Size
File ID
Phase -- Wave Type
Description
Download
103786
100 MB
103786a
phase1-c1
final stack
Download
103786
100 MB
103786b
phase1-c2
final stack
Download
103786
100 MB
103786c
phase1-c1
matched migration
Download
103786
100 MB
103786d
phase1-c2
matched migration
Download
103786
100 MB
103786e
phase1-R'
matched migration
Download
 
 
 
 
 
 
103790
140 MB
103790a
phase2-c1
final stack
Download
103790
140 MB
103790b
phase2-c2
final stack
Download
103790
140 MB
103790c
phase2-c1
final migration
Download
103790
140 MB
103790d
phase2-c2
final migration
Download
103790
140 MB
103790e
phase2-R'
final migration
Download
103790
100 MB
103790f
phase2-c1
matched migration
Download
103790
100 MB
103790g
phase2-c2
matched migration
Download
103790
100 MB
103790h
phase2-R'
matched migration
Download
 
 
 
 
 
 
103828
5 MB
103828a
phase1-pz
35 CDP gathers (every fourth) from inline 1104
Download
103828
11 MB
103828b
phase2-pz
48 CDP gathers (every fourth) from inline 1104
Download
 
 
 
 
 
 
104540
220 MB
104540a
phase1-pz
final stack
Download
104540
220 MB
104540b
phase1-pz
final migration
Download
104540
220 MB
104540c
phase1-pz
matched migration
Download
 
 
 
 
 
 
104542
300 MB
104542a
phase2-pz
final stack
Download
104542
300 MB
104542b
phase2-pz
final migration
Download
104542
220 MB
104542c
phase2-pz
matched migration
Download

 

Confessions: (1) I am not certain what CGG means by "matched migration." (2) I think R' means the radial component of the C-wave recordings. (C-waves are "converted" waves — P-wave down, S-wave up.)

 

Other Teal South data

Below are links to download various non-seismic data.

 

Teal South well tracks

 

Beware: The P-P (also called PZ) data have proven reliable and interesting to a variety of researchers. However, the P-S (converted wave) data seem to have unreliable amplitudes. I do not know of any researcher (including myself) who has trusted the P-S data to make reliable conclusions.