The Daqing oil field in northeastern China presents an example of the geologic and geochemical conditions necessary for the formation of a giant field in a basin containing only continental (nonmarine) sediments. The geochemical characteristics of the stages of generation, expulsion, migration, and accumulation of oil and gas and their relations to trap development are especially pertinent.

The model presented shows close coordination of five bodies (source bed, carrier bed, reservoir, trap, and cap rock) and simultaneous evolution through five stages to form the giant oil field in a large eutrophic lake basin.

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