China Petroleum Exploration ›› 2020, Vol. 25 ›› Issue (3): 83-95.DOI: 10.3969/j.issn.1672-7703.2020.03.008

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Analysis of the main controlling factors of oil and gas differential accumulation in the Shunbei area, Tarim Basin - taking Shunbei No.1 and No.5 strike-slip fault zones as examples

Liu Baozeng   

  1. Sinopec Northwest Oilfield Company
  • Online:2020-05-15 Published:2020-05-15
  • Supported by:
     

Abstract: The Shunbei oilfield in the Tarim Basin is an ultra-deep carbonate oilfield controlled by strike-slip faults. Influenced by the plane segmentation and vertical stratification of strike-slip faults, there are obvious differences in oil and gas accumulation. In this study, the main controlling factors of oil and gas differential accumulation in the Shunbei area are analyzed, taking Shunbei No.1 and No.5 strike-slip fault zones as examples, combined with the relationship between the characteristics of strike-slip faults and oil-gas dynamic productivity. The results show that: the main controlling factors of oil and gas differential accumulation are the connectivity to source rocks, vertical transporting, and segmentation of the strike-slip faults. The stronger the connectivity of strike-slip faults to source rocks, the higher the degree of hydrocarbon accumulation. The larger the dip angle of the strike-slip fault in the Cambrian gypsum formation, the more favorable the vertical hydrocarbon migration into the Ordovician reservoir. The activity intensity and structural pattern of strike-slip faults determine the scale and connectivity of reservoirs. The scale and connectivity of the reservoirs in transtensional segments are better than those in translational and compression-uplift segments, and so the degree of hydrocarbon accumulation is higher.

 

Key words: Differential accumulation, main controlling factors, strike-slip faults, Shunbei oilfield, Ordovician

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