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Geochemistry including carbon isotopes, biomarkers, and maturity indexes indicates that the oil and gas in the Liwan 3-1 (LW3-1) structure are derived from source beds in the Enping, Wenchang, and Zhuhai formations (fms.). The major contribution is from the Enping fm. Two major sandstone reservoirs in the LW3-1 structure are present in the early Miocene deepwater turbidite fan of the Zhujiang fm....
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