Lithologic Reservoirs ›› 2014, Vol. 26 ›› Issue (5): 23-29.doi: 10.3969/j.issn.1673-8926.2014.05.005

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Influencing factors of Carboniferous volcanic reservoir in Ludong-Wucaiwan area, Junggar Basin

LIU Shuangquan 1，2，CAO Yuanting3，ZHAO Guangliang 1，2，ZHU Jun 4，SHI Ji’an1，ZHANG Shuncun1   

  1. 1. Key Laboratory of Petroleum Resources Research， Institute of Geology and Geophysics， Chinese Academy of Sciences， Lanzhou 730000， China； 2. University of Chinese Academy of Sciences， Beijing 100049， China； 3. Research Institute of Exploration and Development， PetroChina Xinjiang Oilfield Company， Karamay 834000， Xinjiang， China； 4. Research Institute of Exploration and Development， PetroChina Qinghai Oilfield Company， Dunhuang 736200， Gansu， China
  • Online:2014-10-20 Published:2014-10-20

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Abstract: By use of the geochemical parameters of hydrocarbon source rocks, reservoir properties and drilling data, this paper analyzed the hydrocarbon generation conditions, reservoir characteristics and evolution, hydrocarbon migration pattern and reservoir-caprock assemblage of Carboniferous volcanic reservoir in Ludong-Wucaiwan area. The result shows that there mainly developed two sets of hydrocarbon source rocks within the Dishuiquan Formation and Batamayi- neishan Formation in Ludong-Wucaiwan area, and the rocks have high organic matter maturity. The reservoirs possess the characteristic of good properties, strong heterogeneity and a greater physical properties difference between different types of reservoir. Faults and unconformity surfaces are the main hydrocarbon migration channel. As the oil and gas enter into the reservoir along these channels, they formed four reservoir-caprock assemblages: dacitetuff, volcanic breccias-tuff, basalt-mudstone and granite-mudstone. Oil and gas reservoirs mainly enrich in the weathering crust reservoir which is close to the top of the Carboniferous.

Key words:  seismic wave equation, forward modeling, one-way wave, wave field separation, Poynting vector, reverse-time migration

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