Safety in Offshore Drilling

1. Front Matter

   Pages i-viii

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2. Introduction

   1. Front Matter

      Pages 1-1

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   2. Current Drilling Practice and the Occurrence of Shallow Gas

      • Paul K. Prince

      Pages 3-25

   3. Shallow Gas and Gas Seepages: A Dynamic Process?

      • A. G. Judd

      Pages 27-50

3. Acquisition

   1. Front Matter

      Pages 51-51

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   2. High Resolution Seismic Source Specifications Applications and Misapplications

      • C. R. Price

      Pages 53-73

   3. Enhanced Seismic Methods for Marine Hazard Surveys

      • P. Newman

      Pages 75-86

   4. Field Quality Control of Marine Data Acquisition — Past, Present, Future

      • S. G. Middleton

      Pages 87-100

4. Processing, Analysis and Interpretation

   1. Front Matter

      Pages 101-101

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   2. Processing Procedures for High Resolution Seismic Data

      • K. P. Games

      Pages 103-131

   3. Shallow Gas Detection Using AVO Processing of High Resolution Seismic Data

      • A. R. Townsend, T. L. Armstrong

      Pages 133-165

   4. Shallow Gas Reservoirs and Migration Paths Over a Central North Sea Diapir

      • R. S. K. Salisbury

      Pages 167-180

   5. Philosophy of Advanced Interpretations

      • B. P. Meier

      Pages 181-191

   6. ‘SIGNATURE’ the Future Approach to Reliable Shallow Gas Detection

      • J. P. Williams, M. Sarginson

      Pages 193-208

5. Application of Geophysical Data

   1. Front Matter

      Pages 209-209

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   2. Prediction of Shallow Gas from Seismic Data

      • Reidar Kanestrøm, Åshild Skålnes, Per Riste, Trond Eide, Sverre Strandenes

      Pages 211-232

6. Procedures, Regulations and Guidelines

   1. Front Matter

      Pages 233-233

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   2. Quantitative Gas Hazard Analysis: Present Limitations and the Way Forward

      • P. Conn, J. Arthur

      Pages 235-256

   3. UKOOA Recommended Procedures for Mobile Drilling Rig Site Surveys (Geophysical and Hydrographic) — Shallow Gas Aspects

      • P. M. Walker

      Pages 257-289

   4. Rapporteur’s Summary

      • C. D. Green Shell

      Pages 291-293

Shallow Gas determination, prior to drilling, is carried out using 'Engineering Seismic' survey methods. Seismic acquisition data quality is fundamental in achieving this objective as both the data processing methods and interpretation accuracy are subject to the quality of the data obtained. The recent application of workstation based data analysis and interpretation has clearly demonstrated the importance of acquisition data quality on the ability to determine the risks of gas with a high level of confidence. The following pages summarise the 5 primary issues that influence acquisition data QC, suggests future trends and considers their potential impact. The primary issues covered in this paper are: A. Seismic B. Positioning C. QC Data Analysis D. Communications E. Personnel 90 SAFETY IN OFFSHORE DRll.LING FIELD QC ...................... PRIMARY COMPONENTS COMMERCIAL TECHNICAL 1 OPERATIONAL FIGURE 1 HYDROSEARCH The often complex influences of Technical, Commercial and Operational constraints on the acquisition of high quality data require careful management by the QC supervisor in order to achieve a successful seismic survey data set. The following pages only consider the Technical aspects of QC and assume that no Commercial or Operational restrictions are imposed in the achievement of optimum data quality. It is noted however, that such restrictions are frequently responsible for significant compromise in data coverage and quality during routine rig site surveys.

• control
• data acquisition
• detection
• future
• marine
• processing
• quality
• quality control
• research
• reservoir
• safety
• economic geology
• hydrogeology

This book is a worthwhile acquisition for those labs, libraries, and companies working in marine exploration and engineering seismic and sonar surveys.American Association of Petroleum Geologist Bulletin

• British Geological Survey, UK

  D. A. Ardus

• SIPM, The Netherlands

  C. D. Green

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