Geophysical SIG&WorkGroup

An updateA.K.TyagiONGC

2nd Annual Standards Summit & Reception, 6-Nov-2007, St. Regis Hotel, Houston

1. PetroTech January 2005 Delhi

ONGC presented the need for an SIG for Seismic data in the Energistics Meeting in Delhi in Jan 2005.

ONGC presented its Standardization Efforts taken up in Seismic Stack data headers (SEGY Headers ) during its EPINET implementation.

Push for Geophysical Standards with Energistics

2. SPG January 2006, Kolkata

Push for Geophysical Standards with Energistics

ONGC and Energistics hosted a preliminary Geophysics SIG meeting during SPG 2006 meet.

The Participants included CGG, EAGE, Landmark, BP, SEG, Western GECO, Paradigm, Reliance, GSPC, Essar Oil, Satyam Computers, Energistics/POSC and ONGC.

Feedback from SPG-06 Seismic SIG Meeting

Mr Y.B. Sinha Ex-Director (Exploration) ONGC and Ex-Director POSC raised a point that

whether the standards should be developed for Asia or Far East or world wide.

Mr. Leon Thomsen of BP and SEG President-Elect proposed that SEG standards committee

should be involved in making the standards. He also emphasized that standards should have

enough flexibility to allow variation and survival for long time.

Mr. D.S. Mair from Landmark pointed out that EPINET project is a great strength in India and

will be able to help in standardization. Landmark may be interested in developing data

compression related standards.

Mr P. Lanfranchi from CGG suggested that reconciliation of different types of data should be

taken care of.

Mr Eldad Weiss from Paradigm –The Indian extension of SEGY standards could be made

which could possibly be accepted by others at later date.

Western Geco – Data should be standardized technology wise in segments e.g. IFP, Sigma –

Delta, media used etc.

Important suggestions during the SPG-06 Seismic SIG meeting

Feedback from SPG-06 Seismic SIG Meeting

Dr R. Bastia from Reliance – Integration of Seismic and non seismic data and need of the future will be kept in mind

during acquisition and processing. Operators may be asked to adhere to the standard acquisition parameters.

Mr. Kharak Singh from Essar Oil Ltd – Standardization is needed for the parameters which are changing from one

vintage to another. The material/media in which data is being preserved today should be checked for its survival for

next 25 years and standard guide lines should be defined for preservation and future retrieval of data. Data may be

divided by vintage.

Mr. R.N. Pandey from GSPC pointed out that very soon 64 bit processing will become a norm in exploration

business. Hence, standards are to be set to take care of multiple attributes.

Mr Gautam Sen , ONGC – It is to be decided that which data needs to be shared and accordingly standards should

be developed for different stages of API.

Mr. PSN Kutty , ONGC – Standards are user driven and standardization requirement should be identified for data

acquisition and processing.

Important suggestions during the SPG-06 Seismic SIG meeting

As ONGC has started standardization of post-stack data storage in India, Need to

associate SEG with its efforts.

Need for standards at the acquisition stage and subsequently for processed and

interpreted data.

Need to capture the meta data without the intervention of the processor/interpreter.

Business need for portability of seismic data in exchanging and sharing.

Business case for standards in seismic data being generated to enable exchange and

transfer in the expanding Indian E&P industry.

Business need for Interoperability of Geophysical Data & Results with other E&P data &

results for building integrated G&G models.

SPG Jan 2006: Seed list for seismic standardization works emerged

Push for Geophysical Standards with Energistics

3. 2007 Energistics Regional SE Asia SIG Meeting – Jan 2007 Delhi

Push for Geophysical Standards with Energistics

Internally ONGC created a Seismic Task Force to look into the data Standards practiced and perceived requirements of standards in Seismic domain.

ONGC presented a public request for need of Geophysical SIG in Energistics Regional SIG Meeting in Delhi in Jan 07 ( details follow )

Energistics Geophysical SIG & Workgroup for Geophysical Standards Assessment is being initiated with initial funding from ONGC.

1. Review of In-house standardization (Naming Standards / Conventions) efforts of ONGC by

Energistics.

2. Requirement study of all the parameters to be stored in Observers report, Line summary, QC

reports at Acquisition end & processing parameter to be stored in SEGY Headers.

3. The feasibility study of writing Observers report, Line summary, QC reports & Navigation along

with raw data in SEGD format.

4. XML based Data exchange standards for Acquisition /Processing Parameters & velocity data.

5. S/W for Porting Interpreted results to master Database and vice versa.

6. Achieving Geophysical data & interpretation layers interoperability amongst key applications ie.

Openworks/ GeoFrame/ Stratimagic etc.

Energistics Jan 2007 Delhi Meet : Public Request for Geophysical Standards

Push for Geophysical Standards with Energistics

Energistics Jan 2007 Delhi Meet Presentation: Status of present Standards

The seismic data storage formats are well documented . However updating all relevant information in SEG and UKOOA formats are needed to share and exchange both seismic and associated position data.

Standardization of acquisition, processing flows, velocity, and interpretation etc. data can be based on XML (Extensible markup language) that was designed to describe data and to focus on what data is.

Standards are to be specified for the compression algorithms for seismic trace data for transfer of data over networks both lossy and lossless compression techniques

Accepted and adopted Standards for storing final maps as an archival format and also for distribution purposes over the network

Push for Geophysical Standards with Energistics

4. 2007 Follow-up of Energistics Regional SE Asia SIG Meeting – Jan 2007 Delhi

Push for Geophysical Standards with Energistics

Energistics Submitted proposal in march 2007

Energistics Geophysical SIG being initiated

To start with, A workgroup for Geophysical Standards Assessment ( GSA 07)initiated with initial funding from ONGC.

An Introductory preparatory meeting was held on Geophysical SIG in Delhi with Indian Companies on 29th Oct 2007.

Introductory Geophysical SIG Meeting, 29th Oct Delhi

Introductory preparatory meeting with major Indian oil companies

and vendors associated with seismic activities in India. Participants included:

Energy Companies : ONGC, OIL, RIL, BG ( Essar, GSPC could not attend but supportive of the initiative)

Service Companies: WesternGeco, CGG, PGS ( Paradigm, Fugro Geonics could not attend)

IT Companies: Infosys, Satyam, HP, TCS ( IBM could not attend )

Participation

Introductory Geophysical SIG Meeting, 29th Oct Delhi

Appraisal of the ONGC-Energistics Interactions on Geophysical Standards and evolution & functioning of GSA workgroup.

Detailed status & opportunities for standardization in the Geophysical API framework with example cases by ONGC team which was highly appreciated by all the participants.

Response highly encouraging with participants expressing commitment to the initiative as well as participation in the upcoming Energistics meetings.

Next GSA workgroup meeting under Energistics planned in India in Nov 07 last week.

Appraisal

1. Review of In-house standardization (Naming Standards / Conventions) efforts of ONGC by

Energistics.

2. Requirement study of all the parameters to be stored in Observers report, Line summary, QC

reports at Acquisition end & processing parameter to be stored in SEGY Headers.

3. The feasibility study of writing Observers report, Line summary, QC reports & Navigation along

with raw data in SEGD format.

4. XML based Data exchange standards for Acquisition /Processing Parameters & velocity data.

5. S/W for Porting Interpreted results to master Database and vice versa.

6. Achieving Geophysical data & interpretation layers interoperability amongst key applications ie.

Openworks/ GeoFrame/ Stratimagic etc.

Energistics Jan 2007 Delhi Meet : Public Request for Geophysical Standards

Push for Geophysical Standards with Energistics

GSA workgroup: Objective

The present objective is to

Assess the various Geophysical Standards in view of the

requirements of E&P industry

Evaluate all the standards enhancement opportunity in entire API

life cycle of Seismic Data with Oil companies business needs as

the driving objective.

The players include Oil companies, service companies, E&P software

companies and Energistics as facilitator and project manager.

From Energistics Proposal

5. Energistics Geophysical SIG & GSA workgroup

Potential scope covered:

2D, 3D & 4D acquisition , processing, Interpretation

General geophysical data and process flows, compression and large-dataset handling, including network traffic.

Business Processes involved are:

• Geophysical planning and definition of acquisition programs

• Geophysical acquisition operations, processing and transfer

• Geophysical operator data loading to databases and workstations

• Geo-science interpretation and subsequent decision-making

• Geophysical information and knowledge capture

GSA workgroup: Assessment Scope

From Energistics Proposal

GSA Workgroup: Roles & Resource

Energy Company People End-user requirements Practical constraints Funding Subject expertise

Service Company People Practical constraints Data requirements

From Energistics Proposal

GSA Workgroup: Timing and Organization

Form Geophysics Standards Assessment Work Group Can evolve into core resources of Geophysics SIG Ask for resources from Energistics member companies and selected other

people Energistics will provide facilitation and support

Timeline The Workgroup is to start functioning from Nov 2007. The entire stages are planned to be completed by March 2008.

From Energistics Proposal

Assessment Tasks

Assemble baseline material; Orient WorkGroup Energistics, SEG and other standards ( SEGD/SEGY/UKOA etc.)

Review and elaborate requirements from ONGC Largely as presented by ONGC in Jan-07 Energistics Meeting

Solicit comments and more requirements (India, Global) Conceive and analyze alternative Standardization Opportunity:

Conceive and analyze alternative scopes and approaches, keeping track

of the assumptions and consequences of each alternative.

Analyze each alternative.

Prune out the less attractive alternatives.

Do a comparative analysis of the remaining alternatives.

GSA workgroup: Assessment Tasks

From Energistics Proposal

GSA workgroup: Stages of Activities

Stages Jobs

1 Sponsoring & funding actions completed

Identify Leaders ( co-chairs (Energy Co. and Service Co.) and

Project manager/facilitator from Energistics

Initial GSA status appraisal meeting held on 29 oct07

2 Next GSA meeting planned by Energistics in Nov last week in India

Invite participants – especially those operating in India

3 Carry Out Assessment Task - Dec07 to Feb08

4 Results Consolidation: - Mar 08

Prepare deliverables and conduct reviews. Present results. Evaluate Next Steps

Intended Operating Company Benefits

Receipt of consistent geophysical data from various service companies’ field crews and acquisition systems in a neutral manner with respect to software (applications and data management)

Rapid availability of geophysical data for analysis and decision-making.

Elimination of the need for vendor-specific pre-processing software products prior to analysis

Preservation and easy re-use of value-added information and knowledge from previous work steps.

Energistics Geophysics SIG intended Benefits

From Energistics Proposal

Intended Service Company Benefits

Reduction of the need for software product customization for each energy company.

Ability to more easily satisfy energy company needs for rapid data delivery.

Clarity about customer data requirements Preservation and easy re-use of value-added information and

knowledge from previous work steps.

Intended Government Agency Benefits

Easier access to data from multiple sources Lower cost operation Lower risk of errors

From Energistics Proposal

Energistics Geophysics SIG intended Benefits

SEGY Floating Point ConfusionDennis Meisinger, ‘acoaco’, Calgary, CanadaCSEG RECORDER September 2004

SEGY Floating Point ConfusionDennis Meisinger, ‘acoaco’, Calgary, CanadaCSEG RECORDER September 2004

IBM

IEEE

6. Example Cases

Shooting direction

Shot point numbers are decreasing with increasing station numbers as per acquisition report.

The same relation is used in processing for geometry definition

Shooting direction

Shot point numbers are decreasing with increasing Field Files as per acquisition report.

However during reprocessing, for geometry definition increasing field files are associated with increasing shot point numbers

Original Processing

Reprocessed

What went wrong?

As per EBCDIC header, the line is same.

But what about the trace data ?

Is there Any way to resolve this except adhering to Standards?

Seismic section with dry hole (peak-over-trough) and good well (trough-over-peak) penetrate high amplitudes, but only the latter with red-over-blue is representative of low-impedance prospective sand.

From ‘Pitfalls in 3-D Seismic Interpretation’ By Alistair R. Brown

Phase and Polarity

Every seismic interpreter, has the responsibility to determine or verify the phase and polarity of his or her data.

Data phase and polarity critically determine seismic character

Character is key in making an effective well tie and thus correctly identifying seismic horizons.

Compression ratio ~ 50

Difference is essentially noise

A lossy CompressionExample

Thank You