Recognizing Oil Shale Fracture of Chang 7 Member in Ordos Basin Using Logging Data

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  • School of Earth Sciences and Engineering,Xi′an Shiyou University,Xi′an 710065,China

Received date: 2013-06-21

  Revised date: 2013-08-20

  Online published: 2014-02-10

Abstract

There is no effective porosity in oil shale,and fracture network provides main flow path for oil product in this kind of reservoir,thus the development degree of natural fracture system directly affects the exploitation efficiency of oil shale reservoirs.Therefore,the study on oil shale′s fracture is particularly important.Logging curves can identify oil shale accurately,but it is still a challenge to evaluate the development degree of fracture in oil shale.In this work,five logging indexes which could reflect the degree of fracture development in Chang 7 Member  in Ordos Basin were chosen after analyzing the different logging response of oil shale in this area,and the probability model of oil shale was established based on the five defined indexes and their weights which was determined using analytic hierarchy processes.The automatic-quantitative identification of oil shale fractures by computer is realized.Compared the recognition results with the image logging,it shows that this method can accurately recognize the fractures in oil shale,and it can satisfy the identification accuracy requirements of fracture in oil shale formation using logging data.

Key words: Ordos; Oil shale; Fracture; Logging

Cite this article

LIU Zhi-di,ZHAO Jing-zhou . Recognizing Oil Shale Fracture of Chang 7 Member in Ordos Basin Using Logging Data[J]. Natural Gas Geoscience, 2014 , 25(2) : 259 -265 . DOI: 10.11764/j.issn.1672-1926.2014.02.259

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