LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (5): 155-160.doi: 10.3969/j.issn.1673-8926.2015.05.025

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Sequence architecture pattern and hydrocarbon accumulation model of Lower Cretaceous in Wuerxun-Beier Depression, Hailaer Basin

Wu Haibo， Li Junhui， Liu He   

  1.  Research Institute of Exploration and Development ， PetroChina Daqing Oilfield Company Ltd. ，Daqing 163712 ， Heilongjiang ， China
  • Online:2015-09-26 Published:2015-09-26

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Abstract:

Favorable exploration areas and oil and gas reservoir can be predicted more accurately though the analysis of sequence architecture pattern in different tectonic settings. By the use of core, drilling, logging and seismic data, and accorded to sequence interface characteristics, the Lower Cretaceous in Wuerxun-Beier Depression was divided into 3 second-order sequences and 5 third-order sequences. According to the structural setting, Wuerxun-Beier Depression can be divided into fault controlled steep slope zone, gentle slope fault terrace zone and depression zone. Based on these tectonic units, different sequence architecture patterns were established such as fault controlled steep slope, gentle slope fault terrace and depression zone. Different sequence architecture patterns and sedimentary system tract lead to different hydrocarbon accumulation models. Fault-lithology reservoir and fault reservoir mainly developed in fault controlled steep slope zone, fault-lithology reservoir and stratigraphic overlap reservoir mainly developed in gentle slope fault terrace zone, and lens reservoir mainly developed in depression zone. Moreover, fault-lithology reservoir developed in marginal zone of depression.

Key words: rift basin, lowstand fan group, lithologic trap, sedimentary model, Lishui Sag

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