Through the application of precise geochemical exploration technique for oil and gas to the north of a fault depression in the Songliao Basin,the authors have summed up the surface geochemical characteristics of oil and gas in the area and given out technical approaches to precise geochemical exploration and geochemical exploration indicator series.

By analyzing the evaluation process of geochemical prospecting for oil and gas,a geochemical prospecting evaluation model for oil and gas based on GIS data warehouse was presented.

There are great number of ring shape anomalies in surface geochemical prospecting for oil and gas.

Interfering factors in oil and gas geochemical exploration;

This paper deals with the basic principle of applying trace element technique to near-surface oil and gas geochemical exploration,the classification of trace element observational methods,the oil-indicating significance of the criteria,the advance in the application of the trace element method to oil and gas exploration,and the development trend of the trace element geochemical researches.

In recent years,two remarkable changes have taken place in the concept of oil and gas geochemical exploration,i.

Thoughts on study of halo-source correlation: fundamental principles of geochemical exploration;

Basing on the geochemical exploration data and boring data in Daqing oil field as well as referring oil reservoir radioactive singularity model,this paper gives a model between radon distribution on surface and the depth of oil reservoir.

The effectiveness of the oil and gas geochemical exploration indicators includes the stability of the geochemical field of the indicators,the efficiency of the indicators in reflecting the underground oil and gas,and the reproducibility of the geochemical anomalies.