ISO INTERNATIONAL STANDARD 19901-10 First edition 2021-03 Petroleum and natural gas industries Specific requirements for offshore structures - Part 10: Marine geophysical investigations Industries du pétrole et dugaz naturel-Exigences specifiques relativesauxstructuresenmer Partie10:Enquetesgéophysiquesmarines Referencenumber IS019901-10:2021(E) ISO @ ISO 2021 IS0 19901-10:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting below or Iso's memberbody in the country ofthe requester. ISO copyright office CP 40i : Ch.de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +41 22.749 01 11 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2021 - All rights reserved IS0 19901-10:2021(E) Contents Page Foreword ..V Introduction. ..vi 1 Scope. 2 Normative references .. 3 Terms and definitions 4 Symbols and abbreviated terms ..12 4.1 Symbols ..12 4.2 Abbreviated terms ..13 5 Objectives, planning,and quality management ..14 5.1 General .14 5.1.1 Objectives and project specifications ..14 5.1.2 Georeferencing and GIS. .15 5.1.3 Ground model. ..15 5.2 Desk study. ..16 5.2.1 General. .16 5.2.2 Use of exploration 2D and 3D seismic data in a desk study ..17 5.2.3 Desk study for pre-drilling well-site investigations ..17 5.3 Scoping and planning .17 5.3.1 General. .17 5.3.2 Scoping of seafloor mapping and sub-seafloor mapping .19 5.4 Operations planning and data quality management .22 5.4.1 Qualityplan 22 5.4.2 Effects ofattenuation. .23 5.4.3 Data quality management .23 Positioning. .23 6 6.1 General .23 6.2 Coordinate reference systems 24 6.2.1 Horizontal coordinate reference system. 24 6.2.2 Vertical coordinatereference system 24 6.3 Surface positioning requirements 25 6.4 Vessel heading .25 6.4.1 General 25 6.4.2 Gyro compass. 25 6.4.3 GNSSbasedheading reference 26 6.4.4 Alignment 26 6.5 Sub-seapositioning-Ultra-shortbaseline system 26 6.6 Inertial navigation system. .27 6.7 Auxiliary sensor: doppler velocity log 27 6.8 Auxiliary sensor: altimeter. .27 6.9 Auxiliary sensor: pressure-depth sensor .28 7 Seafloor mapping .28 7.1 General .28 7.2 Instrumentation andacquisitionparameters 29 7.2.1 Multi-beam echo sounder. 29 7.2.2 Side scan sonar 31 7.2.3 Auxiliary sensor: velocity of sound in seawater 31 7.3 Data acquisition methods. .32 7.3.1 General. 32 7.3.2 Reconnaissance seafloor mapping 32 7.3.3 Engineering seafloormapping. 33 7.3.4 Detailed engineering seafloor mapping .33 7.4 Seafloor mapping deliverables. .33 @ IS0 2021 - All rights reserved ili