Using the understanding of interference in geophysical exploration for reference

the concept of interference in oil & gas geochemical exploration is proposed and also expounded with the theory of vertical micromigration of hydrocarbon and the working principle of geochemical exploration.There are four basic types of interference sources in oil and gas geochemical exploration: syngenetic process

biochemical gas effect

sample quality difference

and pollution from human activities.The first three types are the main interfering factors; while the last one maybe limited to some individual sampling spots.An analysis is carried out to evaluate the degree of interference based on the study of field exploration cases and results of simulation test.Corresponding measures are proposed to suppress interference in different stages of geochemical exploration

including selection of proper method combination

standardization of the media difference

and accurate anomaly separation and identification.The relationship between anomaly and background shows that the interference is universal in terms of background can occur in any survey areas

while the real interference in terms of anomaly just exists in limited survey areas

and can be suppressed to some extent with proper methods.