Mechanisms of Oil Migration and Accumulation in F,Y Oil Layers of South Songzhan Region, Songliao Basin
- Received Date: 1900-01-01
- Rev Recd Date: 1900-01-01
- Publish Date: 2009-08-10
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Key words:
- South Songzhan /
- Sanzhao Depression /
- F /
- Y oil layers /
- faults connecting sourcerock and reservoir /
- model of reservoir formation
Abstract: The study on the oil reservoir formation and its conditions matching in space revealed that the oil in F,Y oil layers in south Songzhan region, Songliao basin was derived from K1qn1 source rock in Sanzhao depression and two mechanisms of oil migration and accumulation in F,Y oil layers existed. Within the sourcerock area, oil from the K1qn1 source rock migrated downward into F,Y layers through the passageway of the T2 faults connecting sourcerock and reservoir and the driving force of overpressured K1qn1 source rock, and then the oil in F,Y layers migrated short distance along the faults and accumulated in the high fault blocks with the buoyancy force. Outside the sourcerock area, the oil in F,Y layers, Sanzhao depression migrated laterally to south Songzhan along the sandbody connected by faults with the buoyancy force and then accumulated in the upper walls of the faults. Different model of the reservoir formation has different controlling factors. Within the sourcerock area, there are 3 factors, one is that the area of oil from the K1qn1 source rock migrated downward controlled the oil pool formation and its distribution; the second is that the T2 faults connecting the sourcerock and reservoir controlled the place of oil accumulation and the third is that the upper walls of the faults are the main area of oil accumulation. Outside the sourcerock area, there are 2 factors, one is that the traps located in and near the pathways of oil migration can form reservoirs in them; the second is that the upper walls of the faults are favor of oil reservoir formation. From the above comprehensive study, the areas near the T2 faults connecting source and reservoir within the sourcerock area and the upper side of the fault near the path of oil migration outside the sourcerock area should be the favorable objects oil exploration.
| Citation: | WANG Yachun. Mechanisms of Oil Migration and Accumulation in F,Y Oil Layers of South Songzhan Region, Songliao Basin[J]. Acta Sedimentologica Sinica, 2009, 27(4): 752-759.
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