Lithologic Reservoirs ›› 2008, Vol. 20 ›› Issue (1): 69-74.doi: 10.3969/j.issn.1673-8926.2008.01.012

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Migration and accumulation mechanism of sand lens reservoirs and its main controlling factors

MA Zhongliang 1, 2, ZENG Jianhui 1, 2, ZHANG Shanwen3, WANG Yongshi3,WANG Hongyu 1, 2, LIU Huimin3   

  1. 1. State Key Laboratory of Petroleum Resources and Exploration, China University of Petroleum, Beijing 102249, China; 2. Basin & Reservoir Research Center, China University of Petroleum, Beijing 102249, China; 3. Shengli Oilfield Company Ltd., Sinopec, Dongying 257051, China
  • Online:2008-03-15 Published:2008-03-15

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Abstract:

Sand lens reservoir is the main type of lithologic reservoirs for increasing reserves, but its migration and accumulation mechanism is not understood well. The result of 2D physical experiment shows that the physical property of sand lens is closely related to its accumulation, and the oil saturation of sand lens reservoirs varies consistently with the change of the porosity and permeability. Oil always migrates from high potential zone to low potential zone and accumulates in the sealed low potential zone. Fluid potential determines whether sand lens can be input by oil or not. Physical properties and fluid potential are the two main controlling factors for the accumulation of sand tens reservoirs.

Key words: pore structure, fractal geometry, NMR T2 spectrum distribution, petrophysical property, low-porosity and low-permeability reservoir

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