When microscopic sealing features satisfy oil reservoir sealing height

the major oil and gas sealing factors of Taibei Sag in Turpan Harmi Basin are related to caprock thickness

stable plane distribution

fault development and activities.Within two caprock sets of the study area

the Qiketai Formation argillaceous overpressure interval

second set caprock with 20 MPa overpressure and more than 200 m thickness which is the nearly covers the whole sag with continuous and stable distribution

and effectively seals the underlying two stages of oil and gas and more than 95% oil and gas reserves.The faults formed in Himalaya Stage in the east part of Sansan Region made less damage on oil and gas

two sets of caprocks preserved completely

and oil gas distribution thus ketp the original style.In the west part of the region

the fault activities were intensive

the two sets of regional caprocks were broken and the original oil gas distribution style was destoried.This is favourable for the formation of oil and gas reservoirs in Himalaya stage.