Page 174 - Acquisition and Processing of Marine Seismic Data

2.6 QC IN DATA ACQUISITION 165

j. Navigation and positioning system: analysis of source signal, acoustic ranging
Navigation system description and data analysis, rGPS data analysis.
components (Fig. 2.16), system n. Onboard processing: Software and hardware
configuration, surface positioning/DGPS systems available for onboard processing,
and rGPS system (Section 2.1.7), streamer flow and parameter tests, final deliverables.
and source positioning (Section 2.3.2), o. Data and shipments: Seismic data format
acoustic ranging (Section 2.3.4), description, navigation data format
echosounder/gyro/currentmeter/ADCP. description, list of original data tapes and
k. Production summary: Primary time use of contents.
the survey (Fig. 2.107), daily production
lengths (Fig. 2.108), cumulative production 2.6.5.6 HSE Report
lengths (Fig. 2.109), average vessel speed Health, safety and environment (HSE) man-
(Fig. 2.110), line change times (Fig. 2.111), agement is an integral part of marine seismic
daily operations summary (Table 2.22), operations today. Each service company
postplot map, fold distribution maps develops its own safety management and crew
(flexed and unflexed). education/audit system to minimize the injuries
l. HSE implementations: Meetings and drills, onboard, especially during deck operations.
vessel induction, safety events, incident They periodically inform and educate the
reporting, internal and external audits, employees in terms of HSE implications, their
helideck operations, work boat operations, personal responsibilities, precautions that they
marine mammal observations. must take before the geophysical operations,
m. Acquisition QC: Online QC monitoring, procedures and instructions for emergency situ-
offline QC analysis, analysis of seismic ations, safety procedures for onboard activities
data, navigation analysis and processing, and operations to reduce possible hazards based

FIG. 2.107 Primary time use of the survey in hours and percentage, and overall production in kilometers.