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Formation Mechanism and Distribution of Buried Fault Zones in the Jinhu Sag

Wang Weifeng1, Zhou Weiwei1, Zhou Jie2, Li Shaolong3   

  1. 1.School of Geosciences, China University of Petroleum, Qingdao266555, Shandong, China;
    2.The Third Geological Brigade of Liaoning Province,Chaoyang122000,Liaoning,China;
    3.Great Wall Drilling Company,PetroChina, Panjin124000, Liaoning, China
  • Received:2014-01-12 Online:2014-09-26 Published:2014-09-26

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Abstract:

There are many NE-trending faults and NW-trending faults in the Jinhu sag. NW-trending basement faults are weak with a little influence on the sedimentary cover, while there are NW-trending buried fault zones in the cover. NE-trending basement faults are strong with important influence on the sedimentary cover. The Yangcun fault zone and a lot of NE-trending buried fault zones formed in the sedimentary cover. The Shigang major fault zone divids the Jinhu sag into the western slope belt and the eastern sag belt. The eastern sag belt was influenced by “buried” activity of the NW-trending basement faults presenting as segments from tht north to the south.There are a great quantity of nearly parallel  third or fourth-order normal faults in the cover in the Jinhu sag. This fault belts include Bao-Ying parallel-echelon fault belt,Tang-Gang echelon fault belt, Bian-Min-Yang parallel-echelon fault belt, western slope parallel fault belt, Chajian-Nipei parallel-echelon fault belt, contributing to several enriched zone of oil and gas, and this hydrocarbon reservoirs are influenced by NE-trending basement faults and NWtrending basement faults, presenting as NE-,NW-, NS-trending stripe or string. On the basis of regional geological data, gravity and magnetic data, 10 NE-trending buried fault zones, 5 NW-trending buried fault zones, 6 NS-trending buried fault zones are identified. The buried fault zones control the distribution of the sandbody, and improve the reservoir physical property. They make the buried reservoir as zonal distribution, which are favorable zones for hydrocarbon accumulation.

Key words: Jinhu sag, buried fault zone, Yangcun fault zone, formation mechanism, accommodation zones, buried reservoir

CLC Number: 

  • P618.13
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