LITHOLOGIC RESERVOIRS ›› 2015, Vol. 27 ›› Issue (1): 89-94.doi: 10.3969/j.issn.1673-8926.2015.01.013

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Tight sandstone reservoir characteristics and influencing factors of He-1 member of the Lower Shihezi Formation in Dingbei area

MA Chao   

  1.  Research Institute of Exploration and Development ， Sinopec North China Company ， Zhengzhou 450006 ， China
  • Online:2015-02-03 Published:2015-02-03

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Abstract:

He-1 member in Dingbei area is the main producing formation and belongs to typical tight sandstone reservoir, but the study of reservoir characteristics and influencing factors is less, which severely restricts gas reservoir evaluation and optimization. Based on the data of rock thin sections, casting thin sections, porosity and permeability analysis, this paper studied tight sandstone reservoir characteristics and its influencing factors of He-1 member from the reservoir petrology characteristic. The results show that pore types of the tight sandstone reservoir of He-1 member are mainly intergranular dissolved pores and residual intergranular pores. Delta plain distributary channel sand body is favorable reservoir development area. Compaction, pressure solution and cementation are the main factors leading to the reservoir densification and the significant reduction in primary intergranular pores. The reservoir properties are improved due to intergranular dissolved pores produced by dissolution. This study provides basis and methodology for tight sandstone reservoir evaluation and exploration.

Key words:  sequence stratigraphy, main controlling factors, marine geology, source to sink system, Nansha Islands, Wan’an Basin

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