The Characteristic and Reservoir Significance of Lamina in Shale from Yanchang Formation of Ordos Basin

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  • 1.State Key Laboratory of Petroleum Resource and Prospecting,China University of Petroleum,Beijing 102249,China;
    2.Unconventional Natural Gas Institute,China University of Petroleum,Beijing 102200,China

Received date: 2014-09-10

  Revised date: 2014-10-17

  Online published: 2015-03-10

Abstract

Shale with lamina has better reservoir performance,and the lamina may have great effect on shale gas productivity.This study deals with the lamina in shale from Yanchang Formation of Ordos Basin using a combination of meticulous,precise,repeatable laboratory preparation and measurement techniques.The experiments involved are polarizing microscope,scanning electron microscope and QEMSCAN.The experiments show that the lamina in shale from Yanchang Formation is of mechanical origin.The light lamina is mainly composed of detrital minerals.The clay minerals scattered among detrital minerals have better crystal growth morphology.The rim of detrital minerals is dissolved.Dark lamina is mainly composed of clay minerals without good crystal growth morphology.The size of quartz is smaller,compared with quartz in light lamina.Pores widely distributed in clay minerals are rarely connected.

Cite this article

LIU Guo-heng,HUANG Zhi-long,JIANG Zhen-xue,CHEN Jian-fa,CHEN Chang-chao,GAO Xiao-yu . The Characteristic and Reservoir Significance of Lamina in Shale from Yanchang Formation of Ordos Basin[J]. Natural Gas Geoscience, 2015 , 26(3) : 408 -417 . DOI: 10.11764/j.issn.1672-1926.2015.03.0408

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