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Songliao Basin in NE China developed the most productive oilfield in the world sourced from terrestrial rocks. The main source rock of the basin includes member 1 of the Qingshankou (K 2 qn 1 ) and members 1 and 2 of the Nenjiang Formation (K 2 nj 1–2 ). However the exact reasons for the formation of the source rock, especially the K 2 qn 1 are still...
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