DEA-132 – Use of Converted Shear Wave Data to Identify Shallow Water Hazards Prior To Drilling

DEA-132 Use of Converted Shear Wave Data to Identify Shallow Water Hazards Prior To Drilling     Gene Sparkman of ERCH — sparkman@erch.org

Project Summary

DEA-132
“Use of Converted Shear Wave Data to Identify
Shallow Water Hazards Prior To Drilling ”
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DEA Project Number: DEA-132
Project Title: Feasibility of Pre-drill Detection of Sands Likely to Exhibit Shallow Water Flows Using Multi-component Seismic Data
Contractor: John P. Castagna, University of Oklahoma / John Castagna castagna@ou.edu / Allen J. Bertagne, PGS Reservoir (U. S.), Inc. / allenj@hstn.res.pgs.com
Startup Date: September 1, 1999
Scope of Work: The occurrence of shallow water flows has been identified by the Drilling Engineering Association as one of the top five challenges being faced in deepwater drilling. A method for pre-drill delineation of sands that are close to failure, and thus likely to exhibit shallow water flows would be most advantageous in selecting optimal drilling locations and in developing cost-effective well plans.
Current Status: Three companies have joined the project and work including reprocessing the shear wave seismic data has been started. One participant is proposing to shoot a high resolution seismic survey to tie the ocean bottom cable (OBC) data lines included in the study.  Conoco is doing a concurrent study on two of the SWF sites and will make the results available to all participants.
Completion Date: January 2001
Participants: BPAmoco, Chevron, Conoco
Cost per Participant: $55,000 (Phase I)
Comments: Still seeking additional participants.

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New Proposal Summary

DEA-132
“Feasibility of Pre-drill Detection of Sands Likely to Exhibit Shallow Water Flows
Using Multi-component Seismic Data: Proposal for a Joint Industry Project”

Date Submitted: August 2, 1999
Technical Area: Production
Sponsor: Chevron
Title: Feasibility of Pre-drill Detection of Sands Likely to Exhibit Shallow Water Flows Using Multi-component Seismic Data: Proposal for a Joint Industry Project
Submitted by: Gene Sparkman/Energy Research Clearing House/4800 Research Forest Drive, The Woodlands, TX 77381/281-363-7936 sparkman@erch.org
Principal Investigator (s): John P. Castagna, University of Oklahoma / John Castagna castagna@ou.edu / Allen J. Bertagne, PGS Reservoir (U. S.), Inc. / allenj@hstn.res.pgs.com
Business Impact: The occurrence of shallow water flows has been identified by the Drilling Engineering Association as one of the top five challenges being faced in deepwater drilling. A method for pre-drill delineation of sands that are close to failure, and thus likely to exhibit shallow water flows would be most advantageous in selecting optimal drilling locations and in developing cost-effective well plans.
Technical Objectives: It is highly likely that shallow water flow prone sands can be delineated by their anomalously high Vp/Vs ratio. We have available a high quality, deepwater multi-component seismic data set, valued at over $1,000,000, in the vicinity of known shallow water flow occurrences that PGS Reservoir, Inc. is willing to make available for the purposes of this study. We expect to be able to extract Vp/Vs profiles from these data and hope to show that these can be used to delineate sands that have a high probability to experience shallow water flows.
Methodology: 1. Investigate five locations of known shallow water flows within seismic OBC control and select two with adequate well information and multi-component seismic data quality. 2. Extract quantitative Vp/Vs profiles from the data and correlate to well information and known occurrences of shallow water flows. 3. Place the observed Vp/Vs ratios into a stratigraphic framework and geologic context. 4. Ascertain if anomalously high Vp/Vs ratios can be used to delineate sands likely to exhibit shallow water flows.
Deliverables: 1. Final report detailing integration or rock properties, Vp/Vs ratios, and other attributes extracted from the data set. Specific analysis will be emphasized toward identifying the Shallow Water Flow hazard areas. 2. Illustrations of P-wave and S-wave data will be included in the report. 3. Progress Forums will be held to discuss the data integration and results with participants. Note: Participants may license the associated digital seismic data from PGS Reservoir (U.S.), Inc. for an additional fee.
Startup Date: September 1, 1999
Project Duration: Six Months
Cost per Participant: $55,000


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