Detaljer på forslag

Forslagstitel på sprog (en): Petroleum and natural gas industries -- Specific requirements for offshore structures -- Part 10: Marine geophysical investigations
Nummer:DSF/ISO/DIS 19901-10
Type:Forslag
Kilde:ISO
Udvalg:S-406
Udvalgsnavn:Offshore olie og gas
Forslag udgivet:21. jan 2019
Kommentarfrist:20. mar 2019
Antal kommentarer:0
Beskrivelse af forslaget:This document is applicable to operators/end users, contractors and public and regulatory authorities concerned with marine site investigations for offshore structures for petroleum and natural gas industries. This document covers marine geophysical investigations required for planning marine soil investigations, for example for assessment of gas hazard to borehole drilling. This document deals with investigation of the seafloor and the sub‐seafloor, and the integration of the results from the marine soil investigations and marine geophysical investigations. This document applies from shallow coastal waters to water depths of 3 000 m and more. The depth of interest for subseafloor mapping depends on the objectives of the investigation. NOTE 1 – For offshore structures, the depths of investigation are typically in the range 1 m below seafloor to 200 m below seafloor. Some methods for sub‐seafloor mapping can also achieve much greater investigation depths, for example for assessing geohazards for hydrocarbon well drilling. Mapping of well‐site geohazards beneath the seafloor is explicitly included in the scope of this document. This implies depths of investigation that are typically 200 m below the first pressurecontainment casing string or 1 500 m below the seafloor, whichever is greatest. Mapping well‐site geohazards is therefore the deepest type of investigation covered by this document. Four aspects of a marine geophysical investigation are covered. 1) Desk study: A desk study is the starting point for every marine geophysical investigation. Its purpose is to investigate the site using existing data, and to address the need to acquire additional data. The desk study scope and complexity will vary greatly depending on the objectives of the investigation, the data available and the scope of marine site investigation, if required. 2) Geophysical methods: The project specifications provide the type of marine geophysical investigation to be performed, using a classification scheme described in this document. Investigation types are classified based on project‐specific resolution and data density requirements, and whether the seafloor or the sub‐seafloor is to be investigated. For each, a minimum set of geophysical methods is specified in this document. 3) Data acquisition: Certain aspects of the data acquisition operations are covered, e.g. functionality of equipment, and the acquisition parameters as a function of investigation type. Documentation of data acquisition is covered, as it enables the data user to assess the quality of the data. 4) Interpretation: The interpretation of marine geophysical investigation data involves in most cases an integration of the geophysical, geotechnical and other data, the updating or finalising of the ground model, and the provision of a report that contains the results.

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