Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (4): 88-96.doi: 10.3969/j.issn.1673-8926.2014.04.013

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Controlling factors and development periods of fracture of Da’anzhai member in Fuling area, eastern Sichuan Basin

HE Long1， ZHENG Rongcai1， L IANG Xiwen2， X U Wenli1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation， Chengdu University of Technology， Chengdu 610059， China； 2. Research Institute of Exploration and Development， Jianghan Oilfield Company， Sinopec， Wuhan 430223， China
  • Online:2014-08-15 Published:2014-08-15

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Abstract:

The reservoir of Da’anzhai member in Fuling area, eastern Sichuan Basin, is characterized by low porosity, low permeability and strong heterogeneity, and fracture is the main reservoir space. According to outdoor surface occurrence, core observation, thin section analysis, scanning electronic microscope and image logging, this paper divided fractures into three types by genetic mechanism: structural fracture, diagenetic fracture and dissolved fracture, and fractures are characterized by low inclination, long length and high density. The main controlling factors for each type of fractures are lithology, tectonism and diagenesis. Based on the fracture characteristics, isotope analysis of fracture fillings and the acoustic emission experiment of rocks, it is indicated that the fractures can be divided into three stages at least: the late Yanshanian, the early and late Himalayan respectively.

Key words: reservoir characteristics, diagenesis, chlorite rims, fractures, Xujiahe Formation, Woxinshuang area, Sichuan Basin

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