Journal of Jilin University(Earth Science Edition) ›› 2018, Vol. 48 ›› Issue (4): 1018-1029.doi: 10.13278/j.cnki.jjuese.20170051

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Pore Structure and Physical Characteristics of Shale Reservoir Interbedded with Silty Layers: An Example from Zhangjiatan Lacustrine Shale

Zhao Qianping1,2,3, Zhang Lixia1,2,3, Yin Jintao1,2,3, Yu Yuxi4, Jiang Chengfu1,2,3, Wang Hui1,2,3, Gao Chao1,2,3   

  1. 1. Research Institute of Shaanxi Yanchang Petroleum(Group) Co., Ltd., Xi'an 710075, China;
    2. Engineering Technology Research Center of Shale Gas Exploration and Exploitation, Shaanxi Province, Xi'an 710075, China;
    3. Key Laboratory of Lacustrine Shale Gas Accumulation and Exploitation, Shaanxi Province, Xi'an 710075, China;
    4. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
  • Received:2017-09-13 Online:2018-07-26 Published:2018-07-26
  • Supported by:
    Supported by National Science and Technology Major Project(2017ZX05039-001-005)and Shaanxi Yanchang Petroleum Group Science and Technology Project(ycsy2017-ky-A-20)

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Abstract: To systematically study the pore structure and physical characteristics of the shale reservoir, amounts of silty layers were investigated to compare the silty laminated shale, the clayey shale without silty laminae and the siltstone interbeds in the continental shale gas reservoir of Zhangjiatan in the Yanchang Formation, Ordos basin. SEM observation, mercury injection capillary pressure, gas adsorption, porosity and permeability tests were conducted to the 22 samples covering 3 kinds of lithologies in the shale reservoir. The pore types of the clayey layer and the silty layer in the 3 lithologies were studied,and the discrepancies in pore structure and physical properties between the 3 lithologies were analyzed. The results show that the silty laminated shale and the siltstone have larger meso-pore and macro-pore volume with the pore size larger than 100 nm,and they have better fluid storage capacity and higher permeability. Based on the comparative analysis of the compositions, sedimentary texture and diagenesis, it is concluded that the silt-sized brittle grains in the silty layers, such as quartz and feldspars, are favorable for the development of inter-particle pores,and hard to be compacted. The organic acid can also improve the development of dissolution pores in feldspars. The cementation of quartz and other minerals can be inhibited when the grains are coated by liquid hydrocarbons. The silty layer is favorable for pore development and preservation. The silty laminated shale and the siltstone have better pore structures and physical properties than the clayey shale.

Key words: Ordos basin, shale, reservoir, silty laminae, pore structure, physical characteristics

CLC Number: 

  • P618.13
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