Lithologic Reservoirs ›› 2015, Vol. 27 ›› Issue (3): 87-93.doi: 10.3969/j.issn.1673-8926.2015.03.013

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Relationship between fracture characteristics and “ five-property ” of shale reservoir

YAN Jianping 1，2， YAN Yu 2， SIMA Liqiang 2， WEN Danni 2， WEN Xinfang 3， GENG Bin 4   

  1.  1. Sichuan Key Laboratory of Natural Gas Geology ， Southwest Petroleum University ， Chengdu 610500 ， China ；2. School of Resources and Environment ， Southwest Petroleum University ， Chengdu 610500 ， China ；3. Geological Logging Division ， Jiangsu Petroleum Exploration Bureau ， Yangzhou 225002 ， Jiangsu ， China ；4. Institute of Geoscience ， Shengli Oilfield Company ， Sinopec ， Dongying 257015 ， Shandong ， China ）
  • Online:2015-05-26 Published:2015-05-26

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Abstract:

Shale formations are typically characterized by low porosity and low permeability. While, the decisive condition of whether shale formations can be reservoirs is nothing but the existence and development of fracture. Taking shale formations of Funing Formation in Subei Basin as an example, this paper studied the relations of fracture characteristics with lithology, physical properties, oiliness, fracability and electric properties. During the research, petroliferous fractures are easy to found, and it is obvious that the permeability of fractured sample is higher than that of uncracked, which is greater than 10 mD in general. Fracture plays an important role in improving shale permeability and reservoir capabilities. Samples with fractures usually have higher content of calcite and the corresponding lithology is generally calcareous mudstone, limy shale and limy mudstone. The intervals which developed intrinsic fracture have high Young’s modulus, low Poisson’s ratio and high brittleness coefficient. The intervals’ brittleness is strong, and for this reason, these intervals are normally easy fracturing. Using logging response characteristics can easily distinguish fractures with calcite filled and no filling cracks accompany with oil trace. This result provides a basis for identifying effective shale reservoir

Key words: shale, fracture, permeability, brittle mineral, fracability, logging response characteristics, Subei Basin

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