Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (6): 43-50.doi: 10.3969/j.issn.1673-8926.2017.06.006

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Paleo-tectonic restoration in southern Qinshui Basin and its hydrocarbon significance

YIN Shuai1, ZHAO Wei2, Fan Ziyi3   

  1. 1. School of Earth Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. No.2 Oil Production Plant, PetroChina Daqing Oilfield Company, Daqing 163414, Heilongjiang, China;
    3. No.2 Oil Production Plant, Henan Oilfield Company, Sinopec, Nanyang 473400, Henan, China
  • Received:2017-05-16 Revised:2017-07-16 Online:2017-11-21 Published:2017-11-21

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Abstract: The paleohighs are generally favorable accumulation areas for tight gas,so paleo-tectonic restoration is particularly important. Taking southern Qinshui Basin as an example,paleo-tectonic restoration was carried out for key tectonic stages of early Yanshanian(J1-J2), late Yanshan(J3-K1)and middle Himalayan(E-N)periods based on drilling,log and logging data. The results show that the whole area has been uplifted and eroded since the Late Triassic,and the strong erosion area distributed along the NE-SW direction. During the period of Yanshan movement, the paleouplift was inherited, the Permian strata were deformed strongly, and the paleo-tecnonic shows "multi-highs and multi-lows" features. Deplanation occurs during the middle Himalaya movement,and the paleo-tecnonic is gradually close to the current feature. Some of the paleo uplifts gradually become wide and gentle,and their tectonic forms are characterized by wide anticline and closed syncline. The paleo-tectonic units during the middle period of Himalayan movement were divided into highs,ramp and lows. It is suggested that paleo highs should be exlpored for tight sandstone gas in coal measure.

Key words: deep-water reservoir, turbidite fan, Chang 7 oil layers, Ordos Basin

CLC Number: 

  • TE121.2
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