Standard Legend 1995 - Energistics

1 The copyright of this document is vested in Shell International Exploration and Production , The Hague, the Netherlands. All rights document may be reproduced, stored in any retrieval system or transmitted in any form or by any means without the prior written consent of the copyrightowner, except for the purpose of commercial INTERNATIONAL EXPLORATION AND PRODUCTION , THE HAGUEF urther copies can be obtained from SIEP, Document Centre if approved by the custodian of this LEGEND1995 Date of issue: October 1995 INTRODUCTIONThe Shell Exploration & Production Standard Legend 1995 is the Shell Standard for symbols, abbreviations,display formats and terminology applied in hydrocarbon exploration and petroleum engineering.

2 Thebeginnings of the document can be traced back for some 60 years and consequently its contents reflectboth long established and recently introduced practices, as well as international conventions. Some contentsof this document are also to be found in the "AAPG Sample Examination Manual" (Swanson, 1981).The aim of this document is to promote a Standard for communication within Shell's worldwide operatingorganisation, and within industry and academia. The document is also available on a CD-ROM (inserted inthe back cover). However, for copyright reasons the CD-ROM does not include the fold-out 7 contains a short guide on its use.

3 Symbols which are individually numbered can be copied fromthe CD-ROM into other Standard Legend 1995 is a revision of the 1976 edition. Definitions have been largely omitted; forthese, the user is referred to the "Glossary of Geology" (Bates & Jackson, 1987) and the "GeologicalNomenclature" (Visser, 1980).The contents of the various chapters are:- Chapter General contains sections on Rules for Abbreviations, Report Presentation, and StandardDocuments, such as Mud Log, Electrical Log Displays, well Completion (Composite) Log, well Proposal, well R sum , Play Maps and Chapter Wells and Hydrocarbons comprises sections such as well Symbols on Maps and Sections, well Bore Symbols, Hydrocarbon Shows, Hydrocarbon Fields and Surface Hydrocarbon Chapter Topography is based mainly on international Chapter Geology contains the key sections Lithology, Rock Description, and Stratigraphy includingSequence Stratigraphy.

4 Two stratigraphical charts, 'Geological Data Tables Cenozoic - Mesozoic andPalaeozoic', are section Depositional Environments includes abbreviations and colour codes for palaeobathymetry,and a terminology for detailed facies section Palaeogeographical Maps proposes two standards , one for basin scale maps and one forcontinental/global scale section Structural Geology includes a subsection on Trap Chapter Geochemistry deals with source rocks, their evaluation, maturity and Chapter Geophysics is a major chapter including Gravity and Magnetics.

5 The section Seismic alsoencompasses entries on Seismic Interpretation including Seismic Attribute Maps and SeismicStratigraphy, and well Shoot and Vertical Seismic The Alphabetical Index and the Alphabetical Listing of Abbreviations are to be found at the end of thisdocument, together with a number of Appendices, including one on the RGB/CMYK values of thevarious colours to be 1995 edition is the result of a multidisciplinary effort by a group of geologists, stratigraphers,geophysicists, geochemists, petroleum engineers and operations engineers from SIEP, Research andOperating Companies striving for consensus without Project Steering Group, compiler and contributors hope that this new edition will be as widely used asits 1976 Shell Standard Legend 1995 is classed as a non-confidential Hague, September Project Steering Group for the Standard Legend 1995 was:R.

6 Van Loftus WilliamsThe main contributors were: Mondt Naylor QuillienMs LijmbachM. WannierThe final draft was reviewed by the Steering Group, Exploration/Production staff of Shell Research ,and the following OpCos:Brunei Shell Petroleum Co Sdn BhdShell UK Exploration & Production LtdNederlandse Aardolie Maatschappij Shell Petroleum Development Co of Nigeria LtdPetroleum Development Oman LLCS abah Shell Petroleum Co Ltd/Sarawak Shell BhdSupport was also received from Draughting, Desk-Top Publishing, Information Technology and Editing LekC.

7 Van den SchmidtMs WrightAcknowledgements for granting copyrights are due to Professor Harland (Cambridge),Dr Haq (Washington), and Nederlandse Aardolie Maatschappij and Editor: WittSponsor: Loftus CONTENTS Rules for Report Standard Mud Log Electrical Log Displays well Completion (Composite) Log well well R sum Play Maps and WELLS AND well Symbols on Maps and Surface Location Subsurface Location Technical Hydrocarbon Production Injection Completion Geological/Structural Type of Deviated Horizontal Multilateral Multilateral Horizontal well Bore Symbols General Drilling Formation Lithological Sampling and Dip Casing and Completion Formation Production Test Results and Hydrocarbons.

8 Gases and Solid Formation Vintage Hydrocarbon Show Hydrocarbon Show Reporting Hydrocarbon Fields and Prospects on Maps and Sections, Colour Surface Hydrocarbon and Water Seeps (Shows) on Solid Surface Water Springs, Mud Survey Survey Reference Horizontal Control Vertical Control Other Position Survey Control Political Concession Area Limits Area Limits on Artificial Linear Point Area Offshore Structures and Informative Natural Linear Point Area Environmental Elevation Bathymetric Morphological Geological Order of Framework Siliciclastic Carbonate Carbonate Mixed Organic-rich Miscellaneous Igneous Intrusive (Plutonic)

9 Dykes, Extrusive (Volcanic) Metamorphic Lithological Colour Rock Texture and Grain Non-skeletal Non-skeletal Particle Texture and Pellets and Coated Skeletal Compositional Siliciclastics Porosity and Fabric Selective Non-fabric Selective Relative Timing of Porosity Porosity (qualitative by visual estimate) Permeability (qualitative) Archie Archie Porosity Colour Modifying Accessory Fossils, Fossils, Organogenic Stratification and Sedimentary Bed Bedding Character of Base of Bed Miscellaneous Large Sedimentary Ripplemarks on Bedding Horizontal Wavy/Irregular/Lenticular Graded Lineations on Bedding Soft Sediment Syndepositional Marks and Miscellaneous Post-depositional Miscellaneous Post-depositional Diagenetic Lithostratigraphical Lithostratigraphical Zonal Quantity Symbols for Distribution Chronostratigraphy and Sequence Stratigraphical Boundaries on Layer Gaps and Unknown

10 Gaps on Columnar Sections and Stratigraphical Gaps on Layer Depositional Biostratigraphical Colour Maps and Sections, Colour Facies Clastic Carbonate Facies Palaeogeographical Basin Scale Continental/Global Scale Structural Faults, General Faults on Surface Geological and Horizon Symbols for Fault Re-activated Fault Reliability and Horizon Fault-Contour Relationships Folds and Dip and Strike Symbols on Surface Geological Miscellaneous Structural Structural Trap Basic Trap Trap Styles in Different Tectonic Closures on Play.