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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2017  >  39(2): 169-179
Guo Jigang, Guo Kai, Gong Pengqi, Xu Jing, Guo Jing. Reservoir densification and tight-oil charging in Yanchang Formation, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(2): 169-179. doi: 10.11781/sysydz201702169
Citation: Guo Jigang, Guo Kai, Gong Pengqi, Xu Jing, Guo Jing. Reservoir densification and tight-oil charging in Yanchang Formation, Ordos Basin[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2017, 39(2): 169-179. doi: 10.11781/sysydz201702169
shu

Reservoir densification and tight-oil charging in Yanchang Formation, Ordos Basin

doi: 10.11781/sysydz201702169
  • 1.

    Strategic Research Center of Oil and Gas Resources, MLR, Beijing 100034, China

  • 2. Geoscience Center, CNPC Greatwall Drilling Company, Beijing 100101, China

  • 3. Downhole Service Company, CNPC Greatwall Drilling Company, Beijing 100101, China

  • 4. College of Geosciences, China University of Petroleum, Beijing 102249, China

  • Received Date: 2016-11-29
  • Rev Recd Date: 2017-02-17
  • Publish Date: 2017-03-28
    Abstract
  • The Yanchang Formation in Longdong area, Ordos Basin, is characterized by low porosity and permeability and is considered as a tight-oil reservoir. However, reservoir densification and its influence on oil charging are not well-understood. Based on the analysis of reservoir diagenesis, densification history, oil-water distribution, driving force and resistance, the oil charging process in tight-sand reservoirs was discussed. The results showed that porosity evolution of the Chang 6-Chang 8 reservoirs has gone through four stages, and they became tight during the diagenetic A1 stage, which was prior to oil charging. And the large resistance due to narrow pore throats made it impossible for buoyancy to be a driving force. Since the tight-sand reservoir is currently oil-saturated with "sweet spots" in locally high-quality reservoir, the excess pressure difference between the Chang 7 source rock and the Chang 6-Chang 8 reservoir is considered to be the main driving force for oil charging in the tight reservoirs.

     

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