Oil & Gas Geology ›› 2009, Vol. 30 ›› Issue (6): 684-688,691.doi: 10.11743/ogg20090602

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Relationship between tectonic uplifting & erosion and formation of abnormal pressure

Bao Youshu1,2   

  1. 1. College of Geo-Resources and Information, China University of Petroleum, Dongying, Shandong 257061, China;
    2. Geology Research Institute, SINOPEC Shengli Oilfied Company, Dongying, Shandong 257015, China
  • Received:2009-05-19 Online:2009-12-25 Published:2012-01-16

Abstract:

Based on the principles of physical chemistry,a formula is established for quantitatively calculating formation fluid pressure after tectonic uplifting and erosion in a closed system.The calculation results with the formula show that formation pressure after tectonic uplifting and erosion in a closed system depends on such factors as initial formation pressure before tectonic uplifting,compressibility coefficient and expansion coefficient of formation fluid,compressibility coefficient of pore volume,temperature variation before and after uplifting,and erosion thickness.An analysis of compressibility coefficient and expansion coefficient of formation fluid as well as compressibility coefficient of pore volume reveals that an abnormal low pressure is likely to be formed in water-bearing sandstone formations,while an abnormal high pressure is more possible in gas-bearing formations after the uplifting.

Key words: rebound, constringency, compressibility coefficient, expansion coefficient, tectonic uplifting, abnormal pressure

CLC Number: