In view of the peculiar physical and chemical properties of CO₂ gas accumulation, the author holds that only by integrated application of various data and techniques can CO₂ accumulation be effectively recognized. Regional geological analysis and geophysical-geochemical exploration methods should be utilized in an integrated way to evaluate the distribution of non-hydrocarbon gas and then locate objectives for drilling. Non-hydrocarbon chromatographic measurement and infrared CO₂ concentration measurement ought to be performed to realize in-situ drilling dynamic detection of the CO₂ layer. Gas chromatography is used to test related log parameter data and neutron porosity differential values of nuclear logging density so as to make an integrated interpretation of the CO₂ gas layer and recognize CO₂ gas effectively. New key techniques for integrated exploration of CO₂, such as geochemical method and log, are discussed in detail in this paper.