Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (3): 11-16.doi: 10.3969/j.issn.1673-8926.2014.03.003

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Characteristics and origin of low permeability reservoir of the third member of Shahejie Formation in Bozhong 25-1 oilfield

SUN Haitao1， LI Chao2， ZHONG Dakang1， ZHOU Junliang2   

  1. 1. College of Geosciences， China University of Petroleum， Beijing 102249， China； 2. Research Institute of Exploration and Development， Tianjin Branch， CNOOC， Tianjin 300452， China
  • Online:2014-06-06 Published:2014-06-06

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Abstract:

The third member of Shahejie Formaiton in Bozhong 25-1 oilfield is consisted of lithic arkose and feldspathic litharenite, with the current burial depth of 3 300～3 800 m, and the diagenetic evolution reached the middle diagenetic stage. During the diagenetic process, the reservoir physical properties were mainly changed by compaction, cementation and dissolution, and became medium porosity and low permeability reservoir. The reservoir properties were mainly controlled by sedimentary background and diagenetic evolution. Firstly, the gravity flow sedimentary background caused the less primary pores and plenty matrix; secondly, the intense compaction and cementation and weak dissolution caused the medium porosity and low permeability. The relatively high quality reservoir mainly developed in proximal deposited sand bodies, where the reservoir physical properties are high.

Key words:  braided river, braided river delta, sequence stratigraphy, the fourth member of Xujiahe Formation, Sichuan Basin

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