Advances in Earth Science ›› 2010, Vol. 25 ›› Issue (6): 597-604. doi: 10.11867/j.issn.1001-8166.2010.06.0597

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Occurrences of Shale Gas and Their Petroleum Geological Significance 

Zhang Xuefeng 1,Lu Xiancai 1, Zhang Linye 2,Liu Qing 2   

  1. 1. State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, China;
    2. Geological Science Research Institute of Shengli Oilfield, Dongying 257015, China
  • Received:2009-10-20 Revised:2010-04-11 Online:2010-06-10 Published:2010-06-10
  • Contact: Lu Xiancai E-mail:xcljun@nju.edu.cn

Zhang Xuefeng,Lu Xiancai,Zhang Linye,Liu Qing. Occurrences of Shale Gas and Their Petroleum Geological Significance [J]. Advances in Earth Science, 2010, 25(6): 597-604.

As  unconventional  gas resources, shale gas is mainly consistent of the free, adsorbed and dissolved gas accumulated in dark shale beds. Among these occurrences, adsorbed and free gases are the dominated phases. The occurrence of shale gas and various influence factors, such as gas component, material composition (sedimental organic carbon, mineral components, and water saturation), rock texture (porosity, pore structure, and permeability), temperature and pressure, are summarized and evaluated based on previous geological and experimental studies. Because effective porosity and gas saturation are the key factors determining the reserves of free gas, and gas adsorption capacity of shale is the maxium limit of the content of adsorbed gas, it is important to disclose the occurences of shale gas and evaluate potential influencing factors, which will improve the reliability of resource assessment based on volumetric method. Development of new characterization techniques of nanopores structure of shale, and study on the adsorption behaviors of metane on clay surface and in nano-pores under various geological conditions should be carried out urgently to promote the understandings of the occurrences of shale gas, and to acquire reliable parameters used in resource assessment.

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