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Compaction and Primary Hydrocarbon Migration of Immature Source Rocks in Banqiao Depression

Banqiao depression is located in the western part of Huanghua depression where there are two under compaction peaks on a compaction curve of source rocks in the middle section of the Shahejie formation of Eocene(Es) One of them in the middle part of member 1 of the Shahejie formation(Es 1) is formed by hydrocarbon generation of immature source rocks, whose extent is lower than the other peak in member 2 and 3 (Es 2, Es 3) formed by hydrocarbon generation of mature source rocks The unbalance distribution of overpressure resulted in the oil in the middle part of member 1 coming from immature source rock in the same member and the oil in member 2 and 3 coming from mature source rock of lower strata The plane migration of immature oil is also controlled by overpressure, the direction of migration is from higher to lower overpressure, i e from deep trough near well Ban 13 to areas of lower overpressure in the north west, south east and south west