Abstract
Faults are important pathways for fluid and hydrocarbon migration, and they play a crucial role in oil and gas migration and accumulation. But until now, the acquisition of evidence on fluid flow along a fault is still a puzzle. Based on studies of clay minerals, oil geochemistry and fluid inclusions in Shengbei fault zone, we find that: 1) distribution of illite is abnormal; 2) oil in the Sha-2 Member of the Shahejie Formation (Es2) and its overlying intervals was derived from the deep lower source rocks, i.e. the Sha-3 and Sha-4 Members of the Shahejie Formation (Es3 and Es4); and 3) fluid inclusions adjacent to F1 fault in the Es4 have mixed features of Es3 and Es4. These findings indicate that fluid and hydrocarbon migration (both vertical and lateral migration) once occurred along the F1 fault, that is, this fault once acted as a pathway for fluid and hydrocarbon migration.
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