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Yang Jun. Quantitative discrimination of hydrocarbon micro-seepage pattern[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2011, 33(3): 317-322. doi: 10.11781/sysydz201103317
Citation: Yang Jun. Quantitative discrimination of hydrocarbon micro-seepage pattern[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2011, 33(3): 317-322. doi: 10.11781/sysydz201103317
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Quantitative discrimination of hydrocarbon micro-seepage pattern

doi: 10.11781/sysydz201103317

  • Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214151, China

  • Received Date: 2010-07-06
  • Rev Recd Date: 2011-04-09
  • Publish Date: 2011-06-28
    Abstract
  • Studies of hydrocarbon micro-seepage have indicated that,when reservoir has been formed,oil and gas mainly seep as micro-bubble or with water.Based on isopachous stratigraphic model,a quantitative discrimination coefficient of micro-seepage pattern has been proposed and calculated according to general geological theory.It has been concluded that,1) Due to the changes of geological conditions,the micro-seepage pattern of hydrocarbon in strata is also changing;2) Hydrocarbon usually seeps as micro-bubbles and transfers to water-soluble pattern as it comes closer to earth surface.The 2 pa-tterns result in hydrocarbon abnormality on earth surface while diffusion only forms background field;3) Sealing ability of direct seal,stratigraphic physical property and vertical movable water content are the key factors controlling hydrocarbon micro-seepage pattern.Proposal of the discrimination coefficient is significant for micro-seepage mechanism research.It also settled a foundation for numerical simulation,formation interpretation and evaluation of geochemical field in hydrocarbon chemical exploration.

     

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