Surface Geochemical Patterns over Oil and Gas Traps

Surface geochemical exploration for oil and gas is still in the empirical stage,despite50 years has passed since the method was first proposed by Laubmeyer and Sokolov.Aboom of its application is emerging in China followed the depression during60 -70‘s.However,before the method can be accepted by the industry as a routine technique,a rel-atively sound basis should be established.This paper presents several cases overknown oil and gas fields and discusses the factors that effect the surface geochemical ex-pression of underground oil pools.