The purpose of this talk is to highlight essential procedures for production of seismic sections for site survey interpretation Other papers at this conference will concentrate on the use of individual techniques such as attribute analysis etc The main problem with high resolution gas hazard surveys is the very short turnaround time, and therefore it is essential that the processing procedures a recorrect and that no spurious effects are introduced. It is particularly important to produce accurate sections if the subsequent use of workstations is envisaged during the interpretation stage The interpreter must know and understand what has been done to the data he is working on. A brief discussion of acquisition of the data will be presented from the processing point of view. Emphasis will be on the provision of information to the processing house which can save a lot of time and potential errors. Also of crucial importance is the role of those responsible for onboard QC who, if they do not understand the principles of seismic acquisition, may not make the correct decision when circumstances out of the ordinary a rise. An account of some essential QC techniques will be presented, along with examples of correct and incorrect ways of applying some of these procedures. Finally, these topics are clearly illustrated using a typical example of a "bright spot", and some useful characteristics and information one can derive if the time and resources are made available.
During the last conference held by SUT on shallow gas in 1987 I gave a presentation on Interpretation of Shallow Gas, and I ended that talk with a list of suggestions for the future I thought it mlght be interesting to see if things have changed since then The suggestions were
ENCOURAGE R&D INTO SHALLOW GAS DETECTION TECHNIQUES
ENCOURAGE FEEDBACK FROM OIL COMPANIES AFTER DRILLING
STANDARDISATION OF REPORTING OF GAS HAZARDS BY SURVEY COMPANIES
REVIEW OF MINIMUM REQUIREMENTS FOR GAS HAZARD SURVEYS
DETAILED ANALYSIS OF ALL SITES WHERE GAS HAS BEEN FOUND
Taking each of these points in turn
a lot of useful work has been going on particularly using workstations,
no real sign of change here,
it good to see that the UKOOA recommendatlons will be reviewed here tomorrow,
again, no apparent change
Perhaps it would be good to set in motion some way of following through the ideas and benefits of these meetings?
This talk is about bulk processing of high resolution seismic data forsite surveys. I do not intend to present any ‘new techniques’ - there are several other topics on the programme devoted to specific processes and problem-related techniques. Similarly, there are plenty of textbooks which describe the basic principles of processing, and for those who wish to delve into the physics of data processing I have included a reference list a t the end of the presentation.