Microscopic pore structure and reasons making reservoir property weaker of Lower Cambrian Qiongzhusi shale,Sichuan Basin,China

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  • 1.PetroChina Research Institute of Petroleum Exploration & Development,Beijing 100083,China;
    2.Oil & Gas Survey,China Geological Survey,Beijing 100029,China;
    3.The Key Laboratory of Unconventional Petroleum Geology,CGS,Beijing 100029,China

Received date: 2016-04-12

  Revised date: 2016-06-06

  Online published: 2019-09-11

Abstract

The Lower Cambrian Qiongzhusi Formation has characteristics of widespread distribution in the Sichuan Basin and large thickness.It has shale gas geological prospect,but has not yet built industrial capacity.In this paper,scanning electron microscopy analysis,nuclear magnetic resonance,surface area measurement and isothermal adsorption experiments were used to analyze pore types and pore structures of Qiongzhusi cores.The following results were obtained.The type of reservoir space of the Qiongzhusi Formation is sole,which mainly contains pores among clay mineral crystals,with few organic pores,whereas very few pores within brittle minerals and between cracks.Matrix pores are mainly composed of mesopores and micropores with diameter less than 50 nm.The porosity is around 1.4 % to 3.1%.The main reasons for bad reservoir property are as follows:(1)high maturity caused carbonization of organic matters and undevelopment of organic pores;(2)clay minerals are mainly chlorite and illite,strong diagenesis causes high crystallization of clay minerals and reduction of pores among crystals;(3)gas generation exhaustion of liquid hydrocarbon and decreasing pressure in the organic pore lead to the collapse and disappearance in the surrounding rock squeeze and crystallization shrinkage of clay minerals.

Cite this article

Wang Shu-fang, Zhang Zi-ya, Dong Da-zhong, Wang Yu-man, Li Xin-jing, Hu Jun-wen, Huang Jin-liang, Guan Quan-zhong . Microscopic pore structure and reasons making reservoir property weaker of Lower Cambrian Qiongzhusi shale,Sichuan Basin,China[J]. Natural Gas Geoscience, 2016 , 27(9) : 1619 -1628 . DOI: 10.11764/j.issn.1672-1926.2016.09.1619

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