The organic source sedimentary depression (sag) theory was on the whole unsuccessful in the process of guiding oil-gas geologic exploration in Junggar Basin. This paper discusses the essential reasons for the unsuccess, and then puts forward a new mode for petroleum exploration in this basin: not only regarding the sedimentary depression (sag), but also stressing whether the mantle-derived diapiric structures exist in lower crust or not, both of which should be treated as an inseparable unity. For supporting this new mode, nine evidences are listed.
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