Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (2): 46-53.doi: 10.3969/j.issn.1673-8926.2011.02.009

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Characteristics of Permian-Carboniferous volcanic reservoir in Zhongguai-Wuba area in northwestern margin of Junggar Basin

YAO Weijiang1， LI Bing 2，3， ZHANG Shuncun2， SHI Jian2   

  1. 1. Research Institute of Exploration and Development， Xinjiang Oilfield Company， PetroChina， Urumqi 830013， China； 2. Key Laboratory of Petroleum Resources， Research Institute of Geology and Geophysics， Chinese Academy of Sciences， Lanzhou 730000， China； 3. Graduate University of Chinese Academy of Sciences， Beijing 100049， China
  • Online:2011-04-20 Published:2011-04-20

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Abstract:

Volcanic reservoir in Zhongguai-Wuba area in the northwestern margin of Junggar Basin mainly developed in Carboniferous and Jiamuhe Formation of Lower Permian. The volcanic rocks are mainly composed of basalt, andesite, eruptive tuff, volcanic breccia, volcanic breccia lava, rhyolite and a small quantity of intrusive rocks such as granite. The reservoir spaces are made up of primary and secondary spaces. The primary space has poor connectivity, while the secondary space developed reservoir with good connectivity, owing to weathering, denudation and leaching. The reservoir rocks have two types of pore texture. The typeⅠhas poor sorting, while the typeⅡ has good sorting and better properties. The volcanic reservoir in the study area belongs to lowporosity and lowpermeability reservoir. Because of the deep buries, the exploration of volcanic reservoir is different. The properties of volcanic reservoir become better while its age becomes younger.

Key words: carbonate rocks, buried hill, cap rock, Jizhong Depression

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