Lithologic Reservoirs ›› 2012, Vol. 24 ›› Issue (2): 42-47.doi: 10.3969/j.issn.1673-8926.2012.02.009

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Fracture features description of Xujiahe Formation in Puguang area, northeastern Sichuan Basin

TANG Qunying1， YIN Taiju1， LU Yao1， CAIWen1，WU Jun2， REN Qiangyan2   

  1. 1. Key Laboratory of Exploration Technologies for Oil and Gas Resources， Ministry of Education， Yangtze University， Jingzhou 434023， China； 2. No. 3 Oil Production Plant， PetroChina Qinghai Oilfield Company， Dunhuang 736200， China
  • Online:2012-04-20 Published:2012-04-20

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Abstract:

As the main target layer of terrestrial formation in Puguang area, Xujiahe Formation is characterized by poor properties, low porosity and low permeability. Based on core description, slice observation, EMI imaging logging, this paper carried out fine description and study on fractures of Xujiahe Formation in Pulu 1 well, discussed the types, characteristics and distribution rules of fractures, and analyzed its influence on reservoir properties and production capacity. The result shows that fractures developed in Xujiahe Formation in the study area are almost structural with high angles and non-structured with low angles, which have a high degree to be filled by carbon and calcite, and fractures highly developed but unevenly distributed in the second, fourth and sixth member of Xujiahe Formatrion in vertical. It is considered that fractures not only become reservoir spaces of fluid, but also be the flowing channels of fluid, which plays an important role in improving reservoir properties.

Key words: 3D seismic data, multi-survey joint processing, consistent processing, cross correlation computation, interpolation, post-stack time migration

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