7/26/2019 Gorgon Emp Gorgon Gas Development Drilling and Completion Program
2/160
Document No: G1-NT-PLNX0001023 Environment Plan:
DMS ID: 00391225 Gorgon Gas Development Drilling and Completion Program
Revision Date: 9 June 2011 Revision: 0
Chevron Australia Pty Ltd Public Page v
Printed Date: 7 July 2011 Uncontrolled when Printed
Table of Contents
Terminology, Definitions and Abbreviations .................................................................................................. 9
Executive Summary ..................................................................................................................................... 18
1.0
Introduction ........................................................................................................................................ 19
1.1
Proponent ................................................................................................................................ 19
1.2
Project ..................................................................................................................................... 19
1.3
Location ................................................................................................................................... 19
1.4
Gorgon Gas Development Environmental Approvals ............................................................. 23
1.5
Purpose of this Plan ................................................................................................................ 24
1.5.1
Scope of this Environment Plan .............................................................................. 24
1.5.2
Requirements .......................................................................................................... 24
1.5.3
Hierarchy of Documentation .................................................................................... 26
1.5.4
Relevant Standards and Guidelines ........................................................................ 28
1.5.5
Stakeholder Consultation ........................................................................................ 29
1.5.6
Public Availability ..................................................................................................... 30
2.0
Drilling Activities ................................................................................................................................ 31
2.1
Overview ................................................................................................................................. 31
2.2
Well Design and Drilling Details .............................................................................................. 32
2.2.1
Design ...................................................................................................................... 32
2.2.2
Drilling Fluids and Chemical Additives .................................................................... 33
2.2.3
Drilling Fluids and Cuttings Handling and Disposal................................................. 34
2.2.4
Cleaning the SBM Holding Tanks ........................................................................... 35
2.2.5
Cementing Operations ............................................................................................. 35
2.2.6
Pre- and Post-drilling Seabed Surveys ................................................................... 35
2.2.7
Logging .................................................................................................................... 36
2.2.8
Well Testing and Clean-Up ...................................................................................... 36
2.2.9 Well Suspension and Completion ........................................................................... 36
2.2.10 Marine and Support Operations .............................................................................. 36
2.2.11
Time Frame ............................................................................................................. 37
3.0
Existing Marine Environment ............................................................................................................ 38
3.1
Physical Environment ............................................................................................................. 38
3.1.1
Bathymetry and Seabed Features ........................................................................... 38
3.1.2
Metocean Conditions ............................................................................................... 38
3.2
Marine Biological Environment ............................................................................................... 38
3.2.1 Benthic Flora and Fauna ......................................................................................... 39
3.2.2
Macrofauna .............................................................................................................. 39
3.3
Social and Economic Environment ......................................................................................... 43
3.3.1
Petroleum Activities ................................................................................................. 43
3.3.2
Fisheries .................................................................................................................. 43
7/26/2019 Gorgon Emp Gorgon Gas Development Drilling and Completion Program
3/160
Environment Plan: Document No.: G1-NT-PLNX0001023
Gorgon Gas Development Drilling and Completion Program DMS ID: 00391225
Revision: 0 Revision Date: 9 June 2011
Page vi Public Chevron Australia Pty Ltd
Uncontrolled when Printed Printed Date: 7 July 2011
3.3.3
Shipping .................................................................................................................. 44
3.3.4
Recreational and Tourism Activities ....................................................................... 45
3.3.5
Marine Protected Areas .......................................................................................... 45
3.3.6
Shipwrecks.............................................................................................................. 45
3.3.7
Defence Practice Areas .......................................................................................... 45
3.3.8
Cultural Heritage ..................................................................................................... 45
3.3.9
Particular Issues or Sensitivities ............................................................................. 45
4.0
Risk Assessment .............................................................................................................................. 46
4.1
Overview ................................................................................................................................ 46
4.2 Methodology ........................................................................................................................... 46
4.3 Key Outcomes ........................................................................................................................ 61
4.3.1 Routine and Operational Discharges ...................................................................... 61
4.3.2
Noise ....................................................................................................................... 66
4.3.3
Positioning and Presence of the Rig ...................................................................... 67
4.3.4
Quarantine .............................................................................................................. 67
4.3.5
Contingency Plan and Management of Unplanned Operations ............................. 68
5.0
Objectives, Performance Standards and Relevant Documentation ................................................. 72
5.1 Overview ................................................................................................................................ 72
5.2
Objectives ............................................................................................................................... 72
5.3
Performance Standards ......................................................................................................... 72
5.3.1
Discharge of Drilling Fluid and Cuttings ................................................................. 72
5.3.2
Underwater Noise ................................................................................................... 73
5.3.3
Oil/Chemical Spill .................................................................................................... 73
5.3.4
Fuel (Diesel Spill) .................................................................................................... 73
5.3.5
Loss of Well Control .................................................................................
