Measured formation pressure

well-log and mud weight data show that there are overpressures in the southern edge of Junggar basin.Vertically

overpressure distribution is not directly related to the burial depth

it is mainly controlled by stratigraphic horizons

especially the lower Tertiary Anjihaihe Formation has the most evident control over the overpressures.Horizontally

overpressure occur in the 3 structural belts in southern edge of the basin

but there are differences in the east and in the west:in the eastern part overpressures occur in the Anjihaihe Formation only

while in the western part

they occur not only in the Anjihaihe Formation

but also in the Shawan and Ziniguanzi Formation.Analysing the relationship between the well test data and overpressures in the southern edge of Junggar basin

it can be found that the distribution of oil and gas reservoirs are closely related to the overpressures.Being affected by faulting

and due to the differences in mechanism of relationaship between overpressures and preservation of oil and gas reservoirs

the distribution of overpressures and oil and gas reservoirs cannot be corresponding to one anther.As a whole

however

oil and gas would be ready to be reservoired in the normally pressured zone below the moderately abnormal pressured or overpressures zone

which would

therefore

be the favorable target of petroleum exploration;while the overpressured zone with relatively high formation pressure coefficient is unfavorable for oil/gas reservoiring.