wwuhl 1Q%m=~oRETEc~~oL~v coN==NcE Th#smWr msptavrti tilpr-n-atme&hore Tockno~y Conferenceheldln Ho.stcm Texas, 6.9 MaY 196S This Pawrwa8 salectnd for presentation by the OTC Prowam Commmea following revmw of mfomurton Cont8imd in m ab$tmd subnuttsd by the authm(s) Contents of ttw paver as F#eseoted hava motbnn lewmd by the Otfshore Technc.!qy Confe!exe and we subject to conectjmbytfwwlhof[s)~cmabrtal, -me8eni~, tisdnmmsaf!ly refl=t any position cflhe Offshcfe Technology Contwence orkoffmsrs Permissm to COPYIS restricted to an abstract C4 nti more tfmn SW words Illustratmns may not be coPwd The abstract should conb,nconspgcuws achtidoemenb oltiere and bytiom the paper was presented @ . q AbstractConventional 3D surveys, although designed and processed wilh clear exploration objectives in mind, of{cn contain much valuable information in the shallow section This information can add significantly to shallow gas studies based on conventional high resohrlion seismic [cchniqucs. Examples from the North Sea are used to illustrate how an integrated approach to interpretation can lead to a better understanding of [he shallow geology and to a more accurate and reliable assessment of drilling hazards, particularly shallow gas. A ncw apprrx~chto site investigations has been tried and tested and has been found to be both time and cost etTecti\'e.
At present, several methods for estimating groundwater recharge are in use in the UK, resulting in a range of estimates of groundwater recharge in any one area. However, there is a need for a robust national methodology with a firm scientific basis. As a first stage, a simple method has been developed to allow the rapid estimation of the mean annual groundwater recharge on drift‐free areas of the major aquifers of England and Wales. A simple soil‐moisture model, with inputs of daily rainfall and potential evaporation, has been used to produce a series of nomographs. These can be used to estimate (a) mean annual groundwater recharge from data which are readily available, (b) annual values of rainfall, and (c) MORECS potential evaporation for grass. These estimates are aggregated to give the total for the area by including information on the land cover.
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