Pore System Feature of Lower Cambrian Niutitang Formation Shale in Southeast Chongqing

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  • 1.Key Laboratory of Shale Gas Exploration,Ministry of Land and Resources,Chongqing Institute of Geology
    and Mineral Resources,Chongqing 400042,China;2.Chongqing Engineering Research Center for Shale
    Gas Resource & Exploration,Chongqing Institute of Geology and Mineral Resources,Chongqing 400042,
    China;3.Chongqing Shale Gas Research Center of State Key Laboratory of Petroleum Resource and Prospecting,
    Chongqing 400042,China;4.State Key Laboratory of Petroleum Resources & Prospecting,China University
    of Petroleum,Beijing 102249,China;5.Chongqing Institute of Geological Survey,Chongqing 401122,China

Received date: 2015-03-21

  Revised date: 2015-05-22

  Online published: 2015-08-10

Abstract

The pore types and structures are critical to gas bearing capacity of shale reservoirs.Conventional scanning electron microscope,argon ion polishing,high resolution power scanning electron microscope are used to describe pore system of Lower Cambrian Niutitang Formation shale in Southeast Chongqing and discuss the relationship between pore characteristics and gas bearing capacity.There are four categories and nine classes matrix pores and three categories and four classes natural fractures in Lower Cambrian Niutitang Formation shale.Intragranular pore,dissolved pore,high angle shear fracture and low angle decollement fracture constitute the pore system of Lower Cambrian Niutitang Formation shale jointly.The pore system has the characteristics of various types,small pore diameter,poor connectivity and low permeability.Pore volume is mainly provided by the nanoscale pores.No organic pores,poor pore connectivity and regional developed decollement fractures maybe the reason why the Niutitang Formation shale has poor gas-bearing capacity.

Cite this article

JIAO Wei-wei,YUE Feng,CHENG Li-jun,MA Yong,LIU Guang-ming . Pore System Feature of Lower Cambrian Niutitang Formation Shale in Southeast Chongqing[J]. Natural Gas Geoscience, 2015 , 26(8) : 1587 -1595 . DOI: 10.11764/j.issn.1672-1926.2015.08.1587

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