PETROLEUM GEOCHEMICAL ANALYSIS ON THE CIRCULAR ANOMALY OF REMOTE-SENSING IMAGES IN GOBI REGIONS

The comprehensive study on the petroleum geochemical exploration and remote-sensing survey of some northwest desert region has suggested that: (1) in the twelve circular images interpreted on the basis of remote-sensing images, hue anomaly is dominant, image texture anomaly takes the second, and the images are characterized by light yellow, orange and purplish red hue; (2) factor and cluster analyses of data from joint determination of geochemical prospecting and object spectrum on the No. 7 circular image(R,) area and the adjacent regions show that R, is actually a anomalous halo produced by the alteration of hy-drocarbons, and a parameter well drilled in 1995 near R₇ area produced commercial oil flow F (3) statistics also reveal that the average values of C₂,C₃,C₂^-,△C, Hg and other indexes in most circular image anomalies are higher than the regional background value; (4) rank correlatio coefficients indicate that the most similar to R₇ is R₈, then is R₉,R₃,R₄,R₁,R₆ and R₁₂, Successively. All the circular image anomalies mentioned above probably result from the alteration of oil and gas, and are worth paying attention to.