Author Description

About The Author:- S.L.Sah passed Grad. I.E.R.E. from London in 1972. He worked in Ionospheric Research Scheme of All India Radio. He worked also with the Central elctronic Engineering Research Institute, Pilani; civil Aviation Department, Bombay and Physical Research Laboratory, Ahmedabad. He also worked with the Oil and Natural Gas Commission to supervise the design, development, operation and repair of geophysical and communication instruments and other electonic instruments. the many accomplishmnts in his long career include design and development of audio-acoustic cir4cuits; operation, repair and maintenance of ILS, VOR, AD-200 and other navigational aids and development of "payloads" for rockets to monitor the lower atmosphere. He has visited IFP, france to evaluate the use of seismic sources for onshore and offshore exploration. he retired as Chief Engineer (E&T) from ONGC in 1990. He has pubolished more than 110 papers and two books.He is an Associate Member of the Instution of Engineers (India), Member of the Institution of Electrical Engineers (L:ondon) and Fellow of the Institution of Instrumentation Scientists and Technologists (India). Contents:- The search for petroleum requires a multidisciplinary approach. The various geological, geophysical and geochemical surveys point towards the most geographical locations, geological structures, depositional environments and periods for hydrocarbon accumulations. Therefore, an encyclopaedia with multidisciplinary approach is very much in need. This encyclopaedia fulfills all these criteria. It is a mine of information which is comprehensively dealt with in 16 volumes. This will meet the requirements of geologists, Geophysists, geochemists, science students, researchers, libraries and information centres. This will help to promote geophysical understanding. Vol. 1: Exploration—This volume is designed as an encyclopaedic dictionary. The uses of geophysical terms are its subject matter. This also aims at to make t