Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 34-45.doi: 10.12108/yxyqc.20200504

• PETROLEUM GEOLOGY • Previous Articles     Next Articles

Main controlling factors of differential enrichment of oil and gas in fault concentrated zones: a case study from Qinan step-fault zone in Qikou Sag

HU Hewei, LI Huiyong, XU Peng, TAO Li, HUA Xiaoli   

  1. Bohai Petroleum Research Institute, Tianjin Branch of CNOOC Limited, Tianjin 300452, China
  • Received:2019-08-27 Revised:2019-10-28 Online:2020-10-01 Published:2020-08-08

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Abstract: In order to study the oil and gas accumulation law of Qinan step-fault zone,based on 3D seismic,drilling,logging and core data,through the division of fault concentrated zones and the calculation of cumulative uplift amplitude and the thickness of cap rock juxtaposition,the horizontal and vertical differential enrichment law of shallow oil and gas in Qinan step-fault zone of Bohai Bay Basin was analyzed,and the oil and gas accumulation model was established. The results show that:(1)Flower-like faults,mostly antiformal faults,are well developed and densely distributed in NE and NNE-trending belts of Qinan step-fault zone.(2)Horizontally,oil and gas mainly enrich in the inner and marginal parts of the fault concentrated zones,with enrichment degree being higher in the inner part than that in the marginal part. According to the types of fault concentrated zones,oil and gas are mainly concentrated in the antiformal fault concentrated zones,and the cumulative uplift amplitude in the antiformal fault concentrated zones controls the degree of oil and gas enrichment.(3)Vertically,cap rock juxtaposition thickness of E3d2 controls the oil and gas accumulation in middle and shallow layers of the fault concentrated zones.(4)In the antiformal fault concentrated zones with larger cumulative uplift amplitude and cap rock juxtaposition thickness of E3d2 being less than 50 m,oil and gas can pass through the cap rock of E3d2 and accumulate in the middle and shallow layers. The achievement can provide reference for further exploration and evaluation in the study area.

Key words: fault concentrated zone, cumulative uplift amplitude, accumulation model, Qinan step-fault belt, Bohai Bay Basin

CLC Number: 

  • TE121.2
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