STUDY OF THE EFFECTIVE GEOCHEMICAL EXPLORATION METHODS AND INDICATORS USED IN GOBI AREAS

An experimental study has been made by the different geochemical methods(heat-released hydrocarbon,physically absorbed gas,and wire-absorbed gas,etc) in the selected existing well(Well Chaican 1) area.The area selected for studying the geochemical methods,as well as the effective para-meters and indicators is a Gobi area in Chaiwobao,the Junggar Basin.The study of comparability and the effectiveness of the geochemical indicators in the known oil-and gas-well(Well Chaican 1) was made by the sampling collection techniques and sample testing techniques of the various geochemical methods.The results showed that the physically absorbed gas(or free gas) and the heat-released hydrocarbon could be used as the main geochemical methods in the selected Gobi area.Some indicators have halo anomaly patterns,consistent well with the existing oil and gas well(Well Chaican 1) area,such as physically absorbed gas C₂⁺ and C₄₊₅,and the acid-extraction C₁.The ratio of the physically absorbed gas,eg.iC₄/nC₄,has a apical anomaly pattern,consistent well with the known oil and gas area.