Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (6): 83-88.doi: 10.3969/j.issn.1673-8926.2014.06.014

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Reservoir characteristics and controlling factors of the Triassic Baikouquan Formation in Mahu slope area, Junggar Basin

TAN Kaijun1， WANG Guodong1，LUO Huifen2，QU Yongqiang1，YIN Lu1，CHEN Juan1
  

  1.  1. PetroChina Research Institute of Petroleum Exploration & Development-Northwest ， Lanzhou 730020 ， China ； 2. Gas Company ， PetroChina Xinjiang Oilfield Company ， Karamay 834000 ， Xinjiang ， China
  • Online:2014-11-20 Published:2014-11-20

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Abstract:

 By means of rock slices, casting slices and scanning electron microscope, this paper systematically studied the petrologic feature, reservoir space type, pore throat structure, physical properties and controlling factors of the Triassic Baikouquan Formation in Mahu slope area, Junggar Basin, to find out the effective reservoirs in this area. The study results show that: ①The reservoir type is mainly glutenite of fan delta plain and front subfacies, which is characterized by low compositional and structural maturity, poor to moderate pore throat structure, plain subfacies is dominated by primary pores, and front subfacies is mainly of secondary pores, with low porosity and permeability on the whole. ②The area developing rigid particles has the characteristics of weak compaction, high corrosion mineral content, strong dissolution and preferable physical properties. ③The plain subfacies has higher compaction degree, higher matrix content, weaker dissolution and poorer physical properties, comparing to the front subfacies. ④The compaction can reduce the pores obviously, the cementation can not, the dissolution can increase pores, and the hydrocarbon emplacement has definite inhibitory effect on diagenesis, which is helpful to improve the reservoir properties

Key words:  carbonate rock , dissolved cave , fluid identification , pre-stack simultaneous inversion, P-S wave velocity ratio

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