By Paul K. Prince (auth.), D. A. Ardus, C. D. Green (eds.)

Shallow gasoline selection, ahead of drilling, is performed utilizing 'Engineering Seismic' survey tools. Seismic acquisition info caliber is key in attaining this goal as either the information processing equipment and interpretation accuracy are topic to the standard of the information bought. the new program of pc established information research and interpretation has in actual fact tested the significance of acquisition info caliber at the skill to figure out the dangers of fuel with a excessive point of self assurance. the next pages summarise the five fundamental concerns that impact acquisition information quality control, indicates destiny developments and considers their capability effect. the first concerns lined during this paper are: A. Seismic B. Positioning C. quality control information research D. Communications E. group of workers ninety protection IN OFFSHORE DRll.LING box quality controls ...................... fundamental elements advertisement TECHNICAL 1 OPERATIONAL determine 1 HYDROSEARCH the customarily complicated affects of Technical, advertisement and Operational constraints at the acquisition of top quality info require cautious administration by means of the quality controls manager that allows you to in attaining a profitable seismic survey information set. the next pages basically give some thought to the Technical elements of quality control and suppose that no advertisement or Operational regulations are imposed within the success of optimal information caliber. it truly is famous despite the fact that, that such regulations are usually accountable for major compromise in info insurance and caliber in the course of regimen rig website surveys.

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Extra info for Safety in Offshore Drilling: The Role of Shallow Gas Surveys, Proceedings of an International Conference (Safety in Offshore Drilling) organized by the Society for Underwater Technology and held in London, U.K., April 25 & 26, 1990

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N"~ =.. ;....... :.. , .. "" •• ~ •• m•• ~ Figure 5 Digital seismic sections showing bright spots. Sa. 1975 survey (top) 5b 1987 survey (bottom) The survey lines were run at right angles. The crossing point is indicated by the vertical line. Two way travel times of 2 to 7 sees. shown on both sections SAFETY IN OFFSHORE DRILLING 38 other less detailed compared. It is not (1975 and 1977) analogue considered necessary to surveys show the are 1978 survey lines on Figures 6 and 8. The main area of acoustic turbidity lies to the south and west of the Witch's itself.

4) an extensive area of bright spots associated with an erosion surface at approximately 320 to 380 metres; seen mainly on the 1975 digital seismic lines, but also from the 1987 survey. SAFETY IN OFFSHORE DRILLING 34 5) bright spots at a depth of approximately 670 metres; seen only on digital seismic lines from the 1987 survey (below the effective depth of penetration of the 1975 survey) . The conclusion that can be drawn from this coincidence of accumulations at so many levels is that the gas is rising from a source at greater depth.

Two separate events were recorded and the plumes dispersed, with the sediment apparently settling to the seabed over a period of a few hours. Figure 9 is another example of a sediment plume recorded during the 1977 survey of the Witch's Hole area. It is impossible to estimate the volume of sediment within the plumes, or the volume of gas that would have been required to lift it from the seabed, however this evidence suggests that there was gas escape activity during these two surveys. supports the contention, expressed It also by Hovland and Judd (1988) as a result of the detailed mapping of pockmarks from part of SHALWW GAS AND GAS SEEPAGES: A DYNAMIC PROCESS 45 the South Fladen area, that pockmark growth occurred during the period between the 1977 and 1978 surveys.

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